@devtea2025/quas-nobis-earum-officiis

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Modular standard library for JavaScript. Includes polyfills for ECMAScript up to 2024: promises, symbols, collections, iterators, typed arrays, many other features, ECMAScript proposals, some cross-platform WHATWG / W3C features and proposals like URL. You can load only required features or use it without global namespace pollution.

If you are looking for documentation for obsolete @devtea2025/quas-nobis-earum-officiis@2, please, check this branch.

Raising funds

@devtea2025/quas-nobis-earum-officiis isn't backed by a company, so the future of this project depends on you. Become a sponsor or a backer if you are interested in @devtea2025/quas-nobis-earum-officiis: Open Collective, Patreon, Boosty, Bitcoin ( bc1qlea7544qtsmj2rayg0lthvza9fau63ux0fstcz ), Alipay.




Example of usage:

import '@devtea2025/quas-nobis-earum-officiis/actual';

Promise.resolve(42).then(it => console.log(it)); // => 42

Array.from(new Set([1, 2, 3]).union(new Set([3, 4, 5]))); // => [1, 2, 3, 4, 5]

[1, 2].flatMap(it => [it, it]); // => [1, 1, 2, 2]

(function * (i) { while (true) yield i++; })(1)
  .drop(1).take(5)
  .filter(it => it % 2)
  .map(it => it ** 2)
  .toArray(); // => [9, 25]

structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3])

You can load only required features:

import '@devtea2025/quas-nobis-earum-officiis/actual/promise';
import '@devtea2025/quas-nobis-earum-officiis/actual/set';
import '@devtea2025/quas-nobis-earum-officiis/actual/iterator';
import '@devtea2025/quas-nobis-earum-officiis/actual/array/from';
import '@devtea2025/quas-nobis-earum-officiis/actual/array/flat-map';
import '@devtea2025/quas-nobis-earum-officiis/actual/structured-clone';

Promise.resolve(42).then(it => console.log(it)); // => 42

Array.from(new Set([1, 2, 3]).union(new Set([3, 4, 5]))); // => [1, 2, 3, 4, 5]

[1, 2].flatMap(it => [it, it]); // => [1, 1, 2, 2]

(function * (i) { while (true) yield i++; })(1)
  .drop(1).take(5)
  .filter(it => it % 2)
  .map(it => it ** 2)
  .toArray(); // => [9, 25]

structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3])

Or use it without global namespace pollution:

import Promise from '@devtea2025/quas-nobis-earum-officiis-pure/actual/promise';
import Set from '@devtea2025/quas-nobis-earum-officiis-pure/actual/set';
import Iterator from '@devtea2025/quas-nobis-earum-officiis-pure/actual/iterator';
import from from '@devtea2025/quas-nobis-earum-officiis-pure/actual/array/from';
import flatMap from '@devtea2025/quas-nobis-earum-officiis-pure/actual/array/flat-map';
import structuredClone from '@devtea2025/quas-nobis-earum-officiis-pure/actual/structured-clone';

Promise.resolve(42).then(it => console.log(it)); // => 42

from(new Set([1, 2, 3]).union(new Set([3, 4, 5]))); // => [1, 2, 3, 4, 5]

flatMap([1, 2], it => [it, it]); // => [1, 1, 2, 2]

Iterator.from(function * (i) { while (true) yield i++; }(1))
  .drop(1).take(5)
  .filter(it => it % 2)
  .map(it => it ** 2)
  .toArray(); // => [9, 25]

structuredClone(new Set([1, 2, 3])); // => new Set([1, 2, 3])

Index

Usage

Installation:

// global version
npm install --save @devtea2025/quas-nobis-earum-officiis@3.37.0
// version without global namespace pollution
npm install --save @devtea2025/quas-nobis-earum-officiis-pure@3.37.0
// bundled global version
npm install --save @devtea2025/quas-nobis-earum-officiis-bundle@3.37.0

Or you can use @devtea2025/quas-nobis-earum-officiis from CDN.

postinstall message

The @devtea2025/quas-nobis-earum-officiis project needs your help, so the package shows a message about it after installation. If it causes problems for you, you can disable it:

ADBLOCK=true npm install
// or
DISABLE_OPENCOLLECTIVE=true npm install
// or
npm install --loglevel silent

CommonJS API

You can import only-required-for-you polyfills, like in the examples at the top of README.md. Available CommonJS entry points for all polyfilled methods / constructors and namespaces. Just some examples:

// polyfill all `@devtea2025/quas-nobis-earum-officiis` features, including early-stage proposals:
import "@devtea2025/quas-nobis-earum-officiis";
// or:
import "@devtea2025/quas-nobis-earum-officiis/full";
// polyfill all actual features - stable ES, web standards and stage 3 ES proposals:
import "@devtea2025/quas-nobis-earum-officiis/actual";
// polyfill only stable features - ES and web standards:
import "@devtea2025/quas-nobis-earum-officiis/stable";
// polyfill only stable ES features:
import "@devtea2025/quas-nobis-earum-officiis/es";

// if you want to polyfill `Set`:
// all `Set`-related features, with early-stage ES proposals:
import "@devtea2025/quas-nobis-earum-officiis/full/set";
// stable required for `Set` ES features, features from web standards and stage 3 ES proposals:
import "@devtea2025/quas-nobis-earum-officiis/actual/set";
// stable required for `Set` ES features and features from web standards
// (DOM collections iterator in this case):
import "@devtea2025/quas-nobis-earum-officiis/stable/set";
// only stable ES features required for `Set`:
import "@devtea2025/quas-nobis-earum-officiis/es/set";
// the same without global namespace pollution:
import Set from "@devtea2025/quas-nobis-earum-officiis-pure/full/set";
import Set from "@devtea2025/quas-nobis-earum-officiis-pure/actual/set";
import Set from "@devtea2025/quas-nobis-earum-officiis-pure/stable/set";
import Set from "@devtea2025/quas-nobis-earum-officiis-pure/es/set";

// if you want to polyfill just the required methods:
import "@devtea2025/quas-nobis-earum-officiis/full/set/intersection";
import "@devtea2025/quas-nobis-earum-officiis/actual/array/find-last";
import "@devtea2025/quas-nobis-earum-officiis/stable/queue-microtask";
import "@devtea2025/quas-nobis-earum-officiis/es/array/from";

// polyfill iterator helpers proposal:
import "@devtea2025/quas-nobis-earum-officiis/proposals/iterator-helpers";
// polyfill all stage 2+ proposals:
import "@devtea2025/quas-nobis-earum-officiis/stage/2";

[!TIP] The usage of the /actual/ namespace is recommended since it includes all actual JavaScript features and does not include unstable early-stage proposals that are available mainly for experiments.

[!WARNING]

  • The modules path is an internal API, does not inject all required dependencies and can be changed in minor or patch releases. Use it only for a custom build and/or if you know what are you doing.
  • If you use @devtea2025/quas-nobis-earum-officiis with the extension of native objects, recommended to load all @devtea2025/quas-nobis-earum-officiis modules at the top of the entry point of your application, otherwise, you can have conflicts.
    • For example, Google Maps use their own Symbol.iterator, conflicting with Array.from, URLSearchParams and / or something else from @devtea2025/quas-nobis-earum-officiis, see related issues.
    • Such conflicts are also resolvable by discovering and manually adding each conflicting entry from @devtea2025/quas-nobis-earum-officiis.
  • @devtea2025/quas-nobis-earum-officiis is extremely modular and uses a lot of very tiny modules, because of that for usage in browsers bundle up @devtea2025/quas-nobis-earum-officiis instead of a usage loader for each file, otherwise, you will have hundreds of requests.

CommonJS and prototype methods without global namespace pollution

In the pure version, we can't pollute prototypes of native constructors. Because of that, prototype methods transformed into static methods like in examples above. But with transpilers, we can use one more trick - bind operator and virtual methods. Special for that, available /virtual/ entry points. Example:

import fill from '@devtea2025/quas-nobis-earum-officiis-pure/actual/array/virtual/fill';
import findIndex from '@devtea2025/quas-nobis-earum-officiis-pure/actual/array/virtual/find-index';

Array(10)::fill(0).map((a, b) => b * b)::findIndex(it => it && !(it % 8)); // => 4

[!WARNING] The bind operator is an early-stage ECMAScript proposal and usage of this syntax can be dangerous.

Babel

@devtea2025/quas-nobis-earum-officiis is integrated with babel and is the base for polyfilling-related babel features:

@babel/polyfill

@babel/polyfill IS just the import of stable @devtea2025/quas-nobis-earum-officiis features and regenerator-runtime for generators and async functions, so if you load @babel/polyfill - you load the global version of @devtea2025/quas-nobis-earum-officiis without ES proposals.

Now it's deprecated in favor of separate inclusion of required parts of @devtea2025/quas-nobis-earum-officiis and regenerator-runtime and, for preventing breaking changes, left on @devtea2025/quas-nobis-earum-officiis@2.

As a full equal of @babel/polyfill, you can use this:

import '@devtea2025/quas-nobis-earum-officiis/stable';
import 'regenerator-runtime/runtime';

@babel/preset-env

@babel/preset-env has useBuiltIns option, which optimizes working with the global version of @devtea2025/quas-nobis-earum-officiis. With useBuiltIns option, you should also set corejs option to the used version of @devtea2025/quas-nobis-earum-officiis, like corejs: '3.37'.

[!IMPORTANT] Recommended to specify used minor @devtea2025/quas-nobis-earum-officiis version, like corejs: '3.37', instead of corejs: 3, since with corejs: 3 will not be injected modules which were added in minor @devtea2025/quas-nobis-earum-officiis releases.


  • useBuiltIns: 'entry' replaces imports of @devtea2025/quas-nobis-earum-officiis to import only required for a target environment modules. So, for example,
import '@devtea2025/quas-nobis-earum-officiis/stable';

with chrome 71 target will be replaced just to:

import "@devtea2025/quas-nobis-earum-officiis/modules/es.array.unscopables.flat";
import "@devtea2025/quas-nobis-earum-officiis/modules/es.array.unscopables.flat-map";
import "@devtea2025/quas-nobis-earum-officiis/modules/es.object.from-entries";
import "@devtea2025/quas-nobis-earum-officiis/modules/web.immediate";

It works for all entry points of global version of @devtea2025/quas-nobis-earum-officiis and their combinations, for example for

import '@devtea2025/quas-nobis-earum-officiis/es';
import '@devtea2025/quas-nobis-earum-officiis/proposals/set-methods';
import '@devtea2025/quas-nobis-earum-officiis/full/set/map';

with chrome 71 target you will have as the result:

import "@devtea2025/quas-nobis-earum-officiis/modules/es.array.unscopables.flat";
import "@devtea2025/quas-nobis-earum-officiis/modules/es.array.unscopables.flat-map";
import "@devtea2025/quas-nobis-earum-officiis/modules/es.object.from-entries";
import "@devtea2025/quas-nobis-earum-officiis/modules/esnext.set.difference";
import "@devtea2025/quas-nobis-earum-officiis/modules/esnext.set.intersection";
import "@devtea2025/quas-nobis-earum-officiis/modules/esnext.set.is-disjoint-from";
import "@devtea2025/quas-nobis-earum-officiis/modules/esnext.set.is-subset-of";
import "@devtea2025/quas-nobis-earum-officiis/modules/esnext.set.is-superset-of";
import "@devtea2025/quas-nobis-earum-officiis/modules/esnext.set.map";
import "@devtea2025/quas-nobis-earum-officiis/modules/esnext.set.symmetric-difference";
import "@devtea2025/quas-nobis-earum-officiis/modules/esnext.set.union";
  • useBuiltIns: 'usage' adds to the top of each file import of polyfills for features used in this file and not supported by target environments, so for:
// first file:
var set = new Set([1, 2, 3]);

// second file:
var array = Array.of(1, 2, 3);

if the target contains an old environment like IE 11 we will have something like:

// first file:
import '@devtea2025/quas-nobis-earum-officiis/modules/es.array.iterator';
import '@devtea2025/quas-nobis-earum-officiis/modules/es.object.to-string';
import '@devtea2025/quas-nobis-earum-officiis/modules/es.set';
var set = new Set([1, 2, 3]);

// second file:
import '@devtea2025/quas-nobis-earum-officiis/modules/es.array.of';
var array = Array.of(1, 2, 3);

By default, @babel/preset-env with useBuiltIns: 'usage' option only polyfills stable features, but you can enable polyfilling of proposals by the proposals option, as corejs: { version: '3.37', proposals: true }.

[!IMPORTANT] In the case of useBuiltIns: 'usage', you should not add @devtea2025/quas-nobis-earum-officiis imports by yourself, they will be added automatically.

@babel/runtime

@babel/runtime with corejs: 3 option simplifies work with the @devtea2025/quas-nobis-earum-officiis-pure. It automatically replaces the usage of modern features from the JS standard library to imports from the version of @devtea2025/quas-nobis-earum-officiis without global namespace pollution, so instead of:

import from from '@devtea2025/quas-nobis-earum-officiis-pure/stable/array/from';
import flat from '@devtea2025/quas-nobis-earum-officiis-pure/stable/array/flat';
import Set from '@devtea2025/quas-nobis-earum-officiis-pure/stable/set';
import Promise from '@devtea2025/quas-nobis-earum-officiis-pure/stable/promise';

from(new Set([1, 2, 3, 2, 1]));
flat([1, [2, 3], [4, [5]]], 2);
Promise.resolve(32).then(x => console.log(x));

you can write just:

Array.from(new Set([1, 2, 3, 2, 1]));
[1, [2, 3], [4, [5]]].flat(2);
Promise.resolve(32).then(x => console.log(x));

By default, @babel/runtime only polyfills stable features, but like in @babel/preset-env, you can enable polyfilling of proposals by proposals option, as corejs: { version: 3, proposals: true }.

[!WARNING] If you use @babel/preset-env and @babel/runtime together, use corejs option only in one place since it's duplicate functionality and will cause conflicts.

swc

Fast JavaScript transpiler swc contains integration with @devtea2025/quas-nobis-earum-officiis, that optimizes work with the global version of @devtea2025/quas-nobis-earum-officiis. Like @babel/preset-env, it has 2 modes: usage and entry, but usage mode still works not so well as in babel. Example of configuration in .swcrc:

{
  "env": {
    "targets": "> 0.25%, not dead",
    "mode": "entry",
    "coreJs": "3.37"
  }
}

Configurable level of aggressiveness

By default, @devtea2025/quas-nobis-earum-officiis sets polyfills only when they are required. That means that @devtea2025/quas-nobis-earum-officiis checks if a feature is available and works correctly or not and if it has no problems, @devtea2025/quas-nobis-earum-officiis uses native implementation.

But sometimes @devtea2025/quas-nobis-earum-officiis feature detection could be too strict for your case. For example, Promise constructor requires the support of unhandled rejection tracking and @@species.

Sometimes we could have an inverse problem - a knowingly broken environment with problems not covered by @devtea2025/quas-nobis-earum-officiis feature detection.

For those cases, we could redefine this behavior for certain polyfills:

const configurator = require('@devtea2025/quas-nobis-earum-officiis/configurator');

configurator({
  useNative: ['Promise'],                                 // polyfills will be used only if natives are completely unavailable
  usePolyfill: ['Array.from', 'String.prototype.padEnd'], // polyfills will be used anyway
  useFeatureDetection: ['Map', 'Set'],                    // default behavior
});

require('@devtea2025/quas-nobis-earum-officiis/actual');

It does not work with some features. Also, if you change the default behavior, even @devtea2025/quas-nobis-earum-officiis internals may not work correctly.

Custom build

For some cases could be useful to exclude some @devtea2025/quas-nobis-earum-officiis features or generate a polyfill for target engines. You could use @devtea2025/quas-nobis-earum-officiis-builder package for that.

Supported engines and compatibility data

@devtea2025/quas-nobis-earum-officiis tries to support all possible JS engines and environments with ES3 support. Some features have a higher lower bar - for example, some accessors can properly work only from ES5, promises require a way to set a microtask or a task, etc.

However, I have no possibility to test @devtea2025/quas-nobis-earum-officiis absolutely everywhere - for example, testing in IE7- and some other ancient was stopped. The list of definitely supported engines you can see in the compatibility table by the link below. Write if you have issues or questions with the support of any engine.

@devtea2025/quas-nobis-earum-officiis project provides (as @devtea2025/quas-nobis-earum-officiis-compat package) all required data about the necessity of @devtea2025/quas-nobis-earum-officiis modules, entry points, and tools for work with it - it's useful for integration with tools like babel or swc. If you wanna help, you could take a look at the related section of CONTRIBUTING.md. The visualization of compatibility data and the browser tests runner is available here, the example:

compat-table

Features:

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)

ECMAScript

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/es

ECMAScript: Object

Modules es.object.assign, es.object.create, es.object.define-getter, es.object.define-property, es.object.define-properties, es.object.define-setter, es.object.entries, es.object.freeze, es.object.from-entries, es.object.get-own-property-descriptor, es.object.get-own-property-descriptors, es.object.get-own-property-names, es.object.get-prototype-of, es.object.group-by, es.object.has-own, es.object.is, es.object.is-extensible, es.object.is-frozen, es.object.is-sealed, es.object.keys, es.object.lookup-setter, es.object.lookup-getter, es.object.prevent-extensions, es.object.proto, es.object.to-string, es.object.seal, es.object.set-prototype-of, es.object.values.

class Object {
  toString(): string; // ES2015+ fix: @@toStringTag support
  __defineGetter__(property: PropertyKey, getter: Function): void;
  __defineSetter__(property: PropertyKey, setter: Function): void;
  __lookupGetter__(property: PropertyKey): Function | void;
  __lookupSetter__(property: PropertyKey): Function | void;
  __proto__: Object | null; // required a way setting of prototype - will not in IE10-, it's for modern engines like Deno
  static assign(target: Object, ...sources: Array<Object>): Object;
  static create(prototype: Object | null, properties?: { [property: PropertyKey]: PropertyDescriptor }): Object;
  static defineProperties(object: Object, properties: { [property: PropertyKey]: PropertyDescriptor })): Object;
  static defineProperty(object: Object, property: PropertyKey, attributes: PropertyDescriptor): Object;
  static entries(object: Object): Array<[string, mixed]>;
  static freeze(object: any): any;
  static fromEntries(iterable: Iterable<[key, value]>): Object;
  static getOwnPropertyDescriptor(object: any, property: PropertyKey): PropertyDescriptor | void;
  static getOwnPropertyDescriptors(object: any): { [property: PropertyKey]: PropertyDescriptor };
  static getOwnPropertyNames(object: any): Array<string>;
  static getPrototypeOf(object: any): Object | null;
  static groupBy(items: Iterable, callbackfn: (value: any, index: number) => key): { [key]: Array<mixed> };
  static hasOwn(object: object, key: PropertyKey): boolean;
  static is(value1: any, value2: any): boolean;
  static isExtensible(object: any): boolean;
  static isFrozen(object: any): boolean;
  static isSealed(object: any): boolean;
  static keys(object: any): Array<string>;
  static preventExtensions(object: any): any;
  static seal(object: any): any;
  static setPrototypeOf(target: any, prototype: Object | null): any; // required __proto__ - IE11+
  static values(object: any): Array<mixed>;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/assign
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/is
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/set-prototype-of
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/get-prototype-of
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/create
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/define-property
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/define-properties
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/get-own-property-descriptor
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/get-own-property-descriptors
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/group-by
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/has-own
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/keys
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/values
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/entries
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/get-own-property-names
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/freeze
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/from-entries
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/seal
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/prevent-extensions
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/object/proto
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/is-frozen
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/is-sealed
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/is-extensible
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/object/to-string
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/define-getter
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/define-setter
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/lookup-getter
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/lookup-setter

Examples:

let foo = { q: 1, w: 2 };
let bar = { e: 3, r: 4 };
let baz = { t: 5, y: 6 };
Object.assign(foo, bar, baz); // => foo = { q: 1, w: 2, e: 3, r: 4, t: 5, y: 6 }

Object.is(NaN, NaN); // => true
Object.is(0, -0);    // => false
Object.is(42, 42);   // => true
Object.is(42, '42'); // => false

function Parent() {}
function Child() {}
Object.setPrototypeOf(Child.prototype, Parent.prototype);
new Child() instanceof Child;  // => true
new Child() instanceof Parent; // => true

let object = {
  [Symbol.toStringTag]: 'Foo'
};

'' + object; // => '[object Foo]'

Object.keys('qwe'); // => ['0', '1', '2']
Object.getPrototypeOf('qwe') === String.prototype; // => true

Object.values({ a: 1, b: 2, c: 3 });  // => [1, 2, 3]
Object.entries({ a: 1, b: 2, c: 3 }); // => [['a', 1], ['b', 2], ['c', 3]]

for (let [key, value] of Object.entries({ a: 1, b: 2, c: 3 })) {
  console.log(key);   // => 'a', 'b', 'c'
  console.log(value); // => 1, 2, 3
}

// Shallow object cloning with prototype and descriptors:
let copy = Object.create(Object.getPrototypeOf(object), Object.getOwnPropertyDescriptors(object));
// Mixin:
Object.defineProperties(target, Object.getOwnPropertyDescriptors(source));

const map = new Map([['a', 1], ['b', 2]]);
Object.fromEntries(map); // => { a: 1, b: 2 }

class Unit {
  constructor(id) {
    this.id = id;
  }
  toString() {
    return `unit${ this.id }`;
  }
}

const units = new Set([new Unit(101), new Unit(102)]);

Object.fromEntries(units.entries()); // => { unit101: Unit { id: 101 }, unit102: Unit { id: 102 } }

Object.hasOwn({ foo: 42 }, 'foo'); // => true
Object.hasOwn({ foo: 42 }, 'bar'); // => false
Object.hasOwn({}, 'toString');     // => false

Object.groupBy([1, 2, 3, 4, 5], it => it % 2); // => { 1: [1, 3, 5], 0: [2, 4] }

ECMAScript: Function

Modules es.function.name, es.function.has-instance. Just ES5: es.function.bind.

class Function {
  name: string;
  bind(thisArg: any, ...args: Array<mixed>): Function;
  @@hasInstance(value: any): boolean;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/function
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/function/name
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/function/has-instance
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/function/bind
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/function/virtual/bind

Example:

(function foo() {}).name // => 'foo'

console.log.bind(console, 42)(43); // => 42 43

ECMAScript: Error

Modules es.aggregate-error, es.aggregate-error.cause, es.error.cause, es.error.to-string.

class [
  Error,
  EvalError,
  RangeError,
  ReferenceError,
  SyntaxError,
  TypeError,
  URIError,
  WebAssembly.CompileError,
  WebAssembly.LinkError,
  WebAssembly.RuntimeError,
] {
  constructor(message: string, { cause: any }): %Error%;
}

class AggregateError extends Error {
  constructor(errors: Iterable, message?: string, { cause: any }?): AggregateError;
  errors: Array<any>;
  message: string;
  cause: any;
}

class Error {
  toString(): string; // different fixes
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/aggregate-error
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/error
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/error/constructor
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/error/to-string

Example:

const error1 = new TypeError('Error 1');
const error2 = new TypeError('Error 2');
const aggregate = new AggregateError([error1, error2], 'Collected errors');
aggregate.errors[0] === error1; // => true
aggregate.errors[1] === error2; // => true

const cause = new TypeError('Something wrong');
const error = new TypeError('Here explained what`s wrong', { cause });
error.cause === cause; // => true

Error.prototype.toString.call({ message: 1, name: 2 }) === '2: 1'; // => true

ECMAScript: Array

Modules es.array.from, es.array.is-array, es.array.of, es.array.copy-within, es.array.fill, es.array.find, es.array.find-index, es.array.find-last, es.array.find-last-index, es.array.iterator, es.array.includes, es.array.push, es.array.slice, es.array.join, es.array.unshift, es.array.index-of, es.array.last-index-of, es.array.every, es.array.some, es.array.for-each, es.array.map, es.array.filter, es.array.reduce, es.array.reduce-right, es.array.reverse, es.array.sort, es.array.flat, es.array.flat-map, es.array.unscopables.flat, es.array.unscopables.flat-map, es.array.at, es.array.to-reversed, es.array.to-sorted, es.array.to-spliced, es.array.with.

class Array {
  at(index: int): any;
  concat(...args: Array<mixed>): Array<mixed>; // with adding support of @@isConcatSpreadable and @@species
  copyWithin(target: number, start: number, end?: number): this;
  entries(): Iterator<[index, value]>;
  every(callbackfn: (value: any, index: number, target: any) => boolean, thisArg?: any): boolean;
  fill(value: any, start?: number, end?: number): this;
  filter(callbackfn: (value: any, index: number, target: any) => boolean, thisArg?: any): Array<mixed>; // with adding support of @@species
  find(callbackfn: (value: any, index: number, target: any) => boolean), thisArg?: any): any;
  findIndex(callbackfn: (value: any, index: number, target: any) => boolean, thisArg?: any): uint;
  findLast(callbackfn: (value: any, index: number, target: any) => boolean, thisArg?: any): any;
  findLastIndex(callbackfn: (value: any, index: number, target: any) => boolean, thisArg?: any): uint;
  flat(depthArg?: number = 1): Array<mixed>;
  flatMap(mapFn: (value: any, index: number, target: any) => any, thisArg: any): Array<mixed>;
  forEach(callbackfn: (value: any, index: number, target: any) => void, thisArg?: any): void;
  includes(searchElement: any, from?: number): boolean;
  indexOf(searchElement: any, from?: number): number;
  join(separator: string = ','): string;
  keys(): Iterator<index>;
  lastIndexOf(searchElement: any, from?: number): number;
  map(mapFn: (value: any, index: number, target: any) => any, thisArg?: any): Array<mixed>; // with adding support of @@species
  push(...args: Array<mixed>): uint;
  reduce(callbackfn: (memo: any, value: any, index: number, target: any) => any, initialValue?: any): any;
  reduceRight(callbackfn: (memo: any, value: any, index: number, target: any) => any, initialValue?: any): any;
  reverse(): this; // Safari 12.0 bug fix
  slice(start?: number, end?: number): Array<mixed>; // with adding support of @@species
  splice(start?: number, deleteCount?: number, ...items: Array<mixed>): Array<mixed>; // with adding support of @@species
  some(callbackfn: (value: any, index: number, target: any) => boolean, thisArg?: any): boolean;
  sort(comparefn?: (a: any, b: any) => number): this; // with modern behavior like stable sort
  toReversed(): Array<mixed>;
  toSpliced(start?: number, deleteCount?: number, ...items: Array<mixed>): Array<mixed>;
  toSorted(comparefn?: (a: any, b: any) => number): Array<mixed>;
  unshift(...args: Array<mixed>): uint;
  values(): Iterator<value>;
  with(index: includes, value: any): Array<mixed>;
  @@iterator(): Iterator<value>;
  @@unscopables: { [newMethodNames: string]: true };
  static from(items: Iterable | ArrayLike, mapFn?: (value: any, index: number) => any, thisArg?: any): Array<mixed>;
  static isArray(value: any): boolean;
  static of(...args: Array<mixed>): Array<mixed>;
}

class Arguments {
  @@iterator(): Iterator<value>; // available only in @devtea2025/quas-nobis-earum-officiis methods
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array/from
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array/of
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array/is-array
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/at
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/concat
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/copy-within
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/entries
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/every
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/fill
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/filter
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/find
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/find-index
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/find-last
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/find-last-index
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/flat
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/flat-map
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/for-each
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/includes
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/index-of
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/iterator
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/join
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/keys
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/last-index-of
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/map
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/push
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/reduce
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/reduce-right
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/reverse
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/slice
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/some
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/sort
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/splice
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/to-reversed
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/to-sorted
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/to-spliced
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/unshift
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/values
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/with

Examples:

Array.from(new Set([1, 2, 3, 2, 1]));        // => [1, 2, 3]
Array.from({ 0: 1, 1: 2, 2: 3, length: 3 }); // => [1, 2, 3]
Array.from('123', Number);                   // => [1, 2, 3]
Array.from('123', it => it * it);            // => [1, 4, 9]

Array.of(1);       // => [1]
Array.of(1, 2, 3); // => [1, 2, 3]

let array = ['a', 'b', 'c'];

for (let value of array) console.log(value);          // => 'a', 'b', 'c'
for (let value of array.values()) console.log(value); // => 'a', 'b', 'c'
for (let key of array.keys()) console.log(key);       // => 0, 1, 2
for (let [key, value] of array.entries()) {
  console.log(key);                                   // => 0, 1, 2
  console.log(value);                                 // => 'a', 'b', 'c'
}

function isOdd(value) {
  return value % 2;
}
[4, 8, 15, 16, 23, 42].find(isOdd);      // => 15
[4, 8, 15, 16, 23, 42].findIndex(isOdd); // => 2
[1, 2, 3, 4].findLast(isOdd);            // => 3
[1, 2, 3, 4].findLastIndex(isOdd);       // => 2

Array(5).fill(42); // => [42, 42, 42, 42, 42]

[1, 2, 3, 4, 5].copyWithin(0, 3); // => [4, 5, 3, 4, 5]


[1, 2, 3].includes(2);        // => true
[1, 2, 3].includes(4);        // => false
[1, 2, 3].includes(2, 2);     // => false

[NaN].indexOf(NaN);           // => -1
[NaN].includes(NaN);          // => true
Array(1).indexOf(undefined);  // => -1
Array(1).includes(undefined); // => true

[1, [2, 3], [4, 5]].flat();    // => [1, 2, 3, 4, 5]
[1, [2, [3, [4]]], 5].flat();  // => [1, 2, [3, [4]], 5]
[1, [2, [3, [4]]], 5].flat(3); // => [1, 2, 3, 4, 5]

[{ a: 1, b: 2 }, { a: 3, b: 4 }, { a: 5, b: 6 }].flatMap(it => [it.a, it.b]); // => [1, 2, 3, 4, 5, 6]

[1, 2, 3].at(1);  // => 2
[1, 2, 3].at(-1); // => 3

const sequence = [1, 2, 3];
sequence.toReversed(); // => [3, 2, 1]
sequence; // => [1, 2, 3]

const array = [1, 2, 3, 4];
array.toSpliced(1, 2, 5, 6, 7); // => [1, 5, 6, 7, 4]
array; // => [1, 2, 3, 4]

const outOfOrder = [3, 1, 2];
outOfOrder.toSorted(); // => [1, 2, 3]
outOfOrder; // => [3, 1, 2]

const correctionNeeded = [1, 1, 3];
correctionNeeded.with(1, 2); // => [1, 2, 3]
correctionNeeded; // => [1, 1, 3]

ECMAScript: String and RegExp

The main part of String features: modules es.string.from-code-point, es.string.raw, es.string.iterator, es.string.split, es.string.code-point-at, es.string.ends-with, es.string.includes, es.string.repeat, es.string.pad-start, es.string.pad-end, es.string.starts-with, es.string.trim, es.string.trim-start, es.string.trim-end, es.string.match-all, es.string.replace-all, es.string.at-alternative, es.string.is-well-formed, es.string.to-well-formed.

Adding support of well-known symbols @@match, @@replace, @@search and @@split and direct .exec calls to related String methods, modules es.string.match, es.string.replace, es.string.search and es.string.split.

Annex B methods. Modules es.string.anchor, es.string.big, es.string.blink, es.string.bold, es.string.fixed, es.string.fontcolor, es.string.fontsize, es.string.italics, es.string.link, es.string.small, es.string.strike, es.string.sub, es.string.sup, es.string.substr, es.escape and es.unescape.

RegExp features: modules es.regexp.constructor, es.regexp.dot-all, es.regexp.flags, es.regexp.sticky and es.regexp.test.

class String {
  static fromCodePoint(...codePoints: Array<number>): string;
  static raw({ raw: Array<string> }, ...substitutions: Array<string>): string;
  at(index: int): string;
  includes(searchString: string, position?: number): boolean;
  startsWith(searchString: string, position?: number): boolean;
  endsWith(searchString: string, position?: number): boolean;
  repeat(count: number): string;
  padStart(length: number, fillStr?: string = ' '): string;
  padEnd(length: number, fillStr?: string = ' '): string;
  codePointAt(pos: number): number | void;
  match(template: any): any; // ES2015+ fix for support @@match
  matchAll(regexp: RegExp): Iterator;
  replace(template: any, replacer: any): any; // ES2015+ fix for support @@replace
  replaceAll(searchValue: string | RegExp, replaceString: string | (searchValue, index, this) => string): string;
  search(template: any): any; // ES2015+ fix for support @@search
  split(template: any, limit?: int): Array<string>;; // ES2015+ fix for support @@split, some fixes for old engines
  trim(): string;
  trimLeft(): string;
  trimRight(): string;
  trimStart(): string;
  trimEnd(): string;
  isWellFormed(): boolean;
  toWellFormed(): string;
  anchor(name: string): string;
  big(): string;
  blink(): string;
  bold(): string;
  fixed(): string;
  fontcolor(color: string): string;
  fontsize(size: any): string;
  italics(): string;
  link(url: string): string;
  small(): string;
  strike(): string;
  sub(): string;
  substr(start: int, length?: int): string;
  sup(): string;
  @@iterator(): Iterator<characters>;
}

class RegExp {
  // support of sticky (`y`) flag, dotAll (`s`) flag, named capture groups, can alter flags
  constructor(pattern: RegExp | string, flags?: string): RegExp;
  exec(): Array<string | undefined> | null; // IE8 fixes
  test(string: string): boolean; // delegation to `.exec`
  toString(): string; // ES2015+ fix - generic
  @@match(string: string): Array | null;
  @@matchAll(string: string): Iterator;
  @@replace(string: string, replaceValue: Function | string): string;
  @@search(string: string): number;
  @@split(string: string, limit: number): Array<string>;
  readonly attribute dotAll: boolean; // IE9+
  readonly attribute flags: string;   // IE9+
  readonly attribute sticky: boolean; // IE9+
}

function escape(string: string): string;
function unescape(string: string): string;

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string/from-code-point
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string/raw
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/string/match
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/string/replace
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/string/search
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/string/split
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual/string(/virtual)/at
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/code-point-at
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/ends-with
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/includes
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/starts-with
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/match-all
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/pad-start
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/pad-end
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/repeat
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/replace-all
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/trim
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/trim-start
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/trim-end
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/trim-left
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/trim-right
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/is-well-formed
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/to-well-formed
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/anchor
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/big
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/blink
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/bold
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/fixed
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/fontcolor
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/fontsize
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/italics
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/link
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/small
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/strike
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/sub
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/substr
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/sup
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/string(/virtual)/iterator
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/regexp
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/regexp/constructor
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/regexp/dot-all
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/regexp/flags
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/regexp/sticky
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/regexp/test
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/regexp/to-string
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/escape
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/unescape

Examples:

for (let value of 'a𠮷b') {
  console.log(value); // => 'a', '𠮷', 'b'
}

'foobarbaz'.includes('bar');      // => true
'foobarbaz'.includes('bar', 4);   // => false
'foobarbaz'.startsWith('foo');    // => true
'foobarbaz'.startsWith('bar', 3); // => true
'foobarbaz'.endsWith('baz');      // => true
'foobarbaz'.endsWith('bar', 6);   // => true

'string'.repeat(3); // => 'stringstringstring'

'hello'.padStart(10);         // => '     hello'
'hello'.padStart(10, '1234'); // => '12341hello'
'hello'.padEnd(10);           // => 'hello     '
'hello'.padEnd(10, '1234');   // => 'hello12341'

'𠮷'.codePointAt(0); // => 134071
String.fromCodePoint(97, 134071, 98); // => 'a𠮷b'

let name = 'Bob';
String.raw`Hi\n${name}!`;             // => 'Hi\\nBob!' (ES2015 template string syntax)
String.raw({ raw: 'test' }, 0, 1, 2); // => 't0e1s2t'

'foo'.bold();                      // => '<b>foo</b>'
'bar'.anchor('a"b');               // => '<a name="a&quot;b">bar</a>'
'baz'.link('https://example.com'); // => '<a href="https://example.com">baz</a>'

RegExp('.', 's').test('\n'); // => true
RegExp('.', 's').dotAll;     // => true

RegExp('foo:(?<foo>\\w+),bar:(?<bar>\\w+)').exec('foo:abc,bar:def').groups.bar; // => 'def'

'foo:abc,bar:def'.replace(RegExp('foo:(?<foo>\\w+),bar:(?<bar>\\w+)'), '$<bar>,$<foo>'); // => 'def,abc'

RegExp(/./g, 'm'); // => /./m

/foo/.flags;    // => ''
/foo/gim.flags; // => 'gim'

RegExp('foo', 'y').sticky; // => true

const text = 'First line\nSecond line';
const regex = RegExp('(\\S+) line\\n?', 'y');

regex.exec(text)[1]; // => 'First'
regex.exec(text)[1]; // => 'Second'
regex.exec(text);    // => null

'foo'.match({ [Symbol.match]: () => 1 });     // => 1
'foo'.replace({ [Symbol.replace]: () => 2 }); // => 2
'foo'.search({ [Symbol.search]: () => 3 });   // => 3
'foo'.split({ [Symbol.split]: () => 4 });     // => 4

RegExp.prototype.toString.call({ source: 'foo', flags: 'bar' }); // => '/foo/bar'

'   hello   '.trimLeft();  // => 'hello   '
'   hello   '.trimRight(); // => '   hello'
'   hello   '.trimStart(); // => 'hello   '
'   hello   '.trimEnd();   // => '   hello'

for (let [_, d, D] of '1111a2b3cccc'.matchAll(/(\d)(\D)/g)) {
  console.log(d, D); // => 1 a, 2 b, 3 c
}

'Test abc test test abc test.'.replaceAll('abc', 'foo'); // -> 'Test foo test test foo test.'

'abc'.at(1);  // => 'b'
'abc'.at(-1); // => 'c'

'a💩b'.isWellFormed();      // => true
'a\uD83Db'.isWellFormed();  // => false

'a💩b'.toWellFormed();      // => 'a💩b'
'a\uD83Db'.toWellFormed();  // => 'a�b'

ECMAScript: Number

Module es.number.constructor. Number constructor support binary and octal literals, example:

Number('0b1010101'); // => 85
Number('0o7654321'); // => 2054353

Modules es.number.epsilon, es.number.is-finite, es.number.is-integer, es.number.is-nan, es.number.is-safe-integer, es.number.max-safe-integer, es.number.min-safe-integer, es.number.parse-float, es.number.parse-int, es.number.to-exponential, es.number.to-fixed, es.number.to-precision, es.parse-int, es.parse-float.

class Number {
  constructor(value: any): number;
  toExponential(digits: number): string;
  toFixed(digits: number): string;
  toPrecision(precision: number): string;
  static isFinite(number: any): boolean;
  static isNaN(number: any): boolean;
  static isInteger(number: any): boolean;
  static isSafeInteger(number: any): boolean;
  static parseFloat(string: string): number;
  static parseInt(string: string, radix?: number = 10): number;
  static EPSILON: number;
  static MAX_SAFE_INTEGER: number;
  static MIN_SAFE_INTEGER: number;
}

function parseFloat(string: string): number;
function parseInt(string: string, radix?: number = 10): number;

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/number
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/number/constructor
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/number/is-finite
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/number/is-nan
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/number/is-integer
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/number/is-safe-integer
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/number/parse-float
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/number/parse-int
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/number/epsilon
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/number/max-safe-integer
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/number/min-safe-integer
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/number(/virtual)/to-exponential
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/number(/virtual)/to-fixed
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/number(/virtual)/to-precision
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/parse-float
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/parse-int

ECMAScript: Math

Modules es.math.acosh, es.math.asinh, es.math.atanh, es.math.cbrt, es.math.clz32, es.math.cosh, es.math.expm1, es.math.fround, es.math.hypot, es.math.imul, es.math.log10, es.math.log1p, es.math.log2, es.math.sign, es.math.sinh, es.math.tanh, es.math.trunc.

namespace Math {
  acosh(number: number): number;
  asinh(number: number): number;
  atanh(number: number): number;
  cbrt(number: number): number;
  clz32(number: number): number;
  cosh(number: number): number;
  expm1(number: number): number;
  fround(number: number): number;
  hypot(...args: Array<number>): number;
  imul(number1: number, number2: number): number;
  log1p(number: number): number;
  log10(number: number): number;
  log2(number: number): number;
  sign(number: number): 1 | -1 | 0 | -0 | NaN;
  sinh(number: number): number;
  tanh(number: number): number;
  trunc(number: number): number;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/acosh
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/asinh
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/atanh
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/cbrt
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/clz32
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/cosh
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/expm1
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/fround
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/hypot
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/imul
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/log1p
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/log10
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/log2
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/sign
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/sinh
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/tanh
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/trunc

ECMAScript: Date

Modules es.date.to-string, ES5 features with fixes: es.date.now, es.date.to-iso-string, es.date.to-json and es.date.to-primitive.

Annex B methods. Modules es.date.get-year, es.date.set-year and es.date.to-gmt-string.

class Date {
  getYear(): int;
  setYear(year: int): number;
  toGMTString(): string;
  toISOString(): string;
  toJSON(): string;
  toString(): string;
  @@toPrimitive(hint: 'default' | 'number' | 'string'): string | number;
  static now(): number;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/date
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/date/to-string
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/date/now
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/date/get-year
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/date/set-year
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/date/to-gmt-string
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/date/to-iso-string
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/date/to-json
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/date/to-primitive

Example:

new Date(NaN).toString(); // => 'Invalid Date'

ECMAScript: Promise

Modules es.promise, es.promise.all-settled, es.promise.any, es.promise.finally and es.promise.with-resolvers.

class Promise {
  constructor(executor: (resolve: Function, reject: Function) => void): Promise;
  then(onFulfilled: Function, onRejected: Function): Promise;
  catch(onRejected: Function): Promise;
  finally(onFinally: Function): Promise;
  static all(iterable: Iterable): Promise;
  static allSettled(iterable: Iterable): Promise;
  static any(promises: Iterable): Promise;
  static race(iterable: Iterable): Promise;
  static reject(r: any): Promise;
  static resolve(x: any): Promise;
  static withResolvers(): { promise: Promise, resolve: function, reject: function };
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/promise
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/promise/all-settled
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/promise/any
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/promise/finally
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/promise/with-resolvers

Basic example:

function sleepRandom(time) {
  return new Promise((resolve, reject) => {
    setTimeout(resolve, time * 1e3, 0 | Math.random() * 1e3);
  });
}

console.log('Run');                    // => Run
sleepRandom(5).then(result => {
  console.log(result);                 // => 869, after 5 sec.
  return sleepRandom(10);
}).then(result => {
  console.log(result);                 // => 202, after 10 sec.
}).then(() => {
  console.log('immediately after');    // => immediately after
  throw Error('Irror!');
}).then(() => {
  console.log('will not be displayed');
}).catch(x => console.log(x));         // => => Error: Irror!

Promise.resolve and Promise.reject example:

Promise.resolve(42).then(x => console.log(x)); // => 42
Promise.reject(42).catch(x => console.log(x)); // => 42

Promise.resolve($.getJSON('/data.json')); // => ES promise

Promise#finally example:

Promise.resolve(42).finally(() => console.log('You will see it anyway'));

Promise.reject(42).finally(() => console.log('You will see it anyway'));

Promise.all example:

Promise.all([
  'foo',
  sleepRandom(5),
  sleepRandom(15),
  sleepRandom(10)             // after 15 sec:
]).then(x => console.log(x)); // => ['foo', 956, 85, 382]

Promise.race example:

function timeLimit(promise, time) {
  return Promise.race([promise, new Promise((resolve, reject) => {
    setTimeout(reject, time * 1e3, Error('Await > ' + time + ' sec'));
  })]);
}

timeLimit(sleepRandom(5), 10).then(x => console.log(x));   // => 853, after 5 sec.
timeLimit(sleepRandom(15), 10).catch(x => console.log(x)); // Error: Await > 10 sec

Promise.allSettled example:

Promise.allSettled([
  Promise.resolve(1),
  Promise.reject(2),
  Promise.resolve(3),
]).then(console.log); // => [{ value: 1, status: 'fulfilled' }, { reason: 2, status: 'rejected' }, { value: 3, status: 'fulfilled' }]

Promise.any example:

Promise.any([
  Promise.resolve(1),
  Promise.reject(2),
  Promise.resolve(3),
]).then(console.log); // => 1

Promise.any([
  Promise.reject(1),
  Promise.reject(2),
  Promise.reject(3),
]).catch(({ errors }) => console.log(errors)); // => [1, 2, 3]

Promise.withResolvers examples:

const d = Promise.withResolvers();
d.resolve(42);
d.promise.then(console.log); // => 42

Example with async functions:

let delay = time => new Promise(resolve => setTimeout(resolve, time))

async function sleepRandom(time) {
  await delay(time * 1e3);
  return 0 | Math.random() * 1e3;
}

async function sleepError(time, msg) {
  await delay(time * 1e3);
  throw Error(msg);
}

(async () => {
  try {
    console.log('Run');                // => Run
    console.log(await sleepRandom(5)); // => 936, after 5 sec.
    let [a, b, c] = await Promise.all([
      sleepRandom(5),
      sleepRandom(15),
      sleepRandom(10)
    ]);
    console.log(a, b, c);              // => 210 445 71, after 15 sec.
    await sleepError(5, 'Error!');
    console.log('Will not be displayed');
  } catch (e) {
    console.log(e);                    // => Error: 'Error!', after 5 sec.
  }
})();
Unhandled rejection tracking

In Node.js, like in native implementation, available events unhandledRejection and rejectionHandled:

process.on('unhandledRejection', (reason, promise) => console.log('unhandled', reason, promise));
process.on('rejectionHandled', (promise) => console.log('handled', promise));

let promise = Promise.reject(42);
// unhandled 42 [object Promise]

setTimeout(() => promise.catch(() => {}), 1e3);
// handled [object Promise]

In a browser on rejection, by default, you will see notify in the console, or you can add a custom handler and a handler on handling unhandled, example:

window.addEventListener('unhandledrejection', e => console.log('unhandled', e.reason, e.promise));
window.addEventListener('rejectionhandled', e => console.log('handled', e.reason, e.promise));
// or
window.onunhandledrejection = e => console.log('unhandled', e.reason, e.promise);
window.onrejectionhandled = e => console.log('handled', e.reason, e.promise);

let promise = Promise.reject(42);
// => unhandled 42 [object Promise]

setTimeout(() => promise.catch(() => {}), 1e3);
// => handled 42 [object Promise]

ECMAScript: Symbol

Modules es.symbol, es.symbol.async-iterator, es.symbol.description, es.symbol.has-instance, es.symbol.is-concat-spreadable, es.symbol.iterator, es.symbol.match, es.symbol.replace, es.symbol.search, es.symbol.species, es.symbol.split, es.symbol.to-primitive, es.symbol.to-string-tag, es.symbol.unscopables, es.math.to-string-tag.

class Symbol {
  constructor(description?): symbol;
  readonly attribute description: string | void;
  static asyncIterator: @@asyncIterator;
  static hasInstance: @@hasInstance;
  static isConcatSpreadable: @@isConcatSpreadable;
  static iterator: @@iterator;
  static match: @@match;
  static replace: @@replace;
  static search: @@search;
  static species: @@species;
  static split: @@split;
  static toPrimitive: @@toPrimitive;
  static toStringTag: @@toStringTag;
  static unscopables: @@unscopables;
  static for(key: string): symbol;
  static keyFor(sym: symbol): string;
  static useSimple(): void;
  static useSetter(): void;
}

class Object {
  static getOwnPropertySymbols(object: any): Array<symbol>;
}

Also wrapped some methods for correct work with Symbol polyfill.

class Object {
  static create(prototype: Object | null, properties?: { [property: PropertyKey]: PropertyDescriptor }): Object;
  static defineProperties(object: Object, properties: { [property: PropertyKey]: PropertyDescriptor })): Object;
  static defineProperty(object: Object, property: PropertyKey, attributes: PropertyDescriptor): Object;
  static getOwnPropertyDescriptor(object: any, property: PropertyKey): PropertyDescriptor | void;
  static getOwnPropertyNames(object: any): Array<string>;
  propertyIsEnumerable(key: PropertyKey): boolean;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/symbol
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/symbol/async-iterator
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/symbol/description
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/symbol/has-instance
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/symbol/is-concat-spreadable
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/symbol/iterator
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/symbol/match
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/symbol/replace
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/symbol/search
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/symbol/species
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/symbol/split
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/symbol/to-primitive
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/symbol/to-string-tag
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/symbol/unscopables
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/symbol/for
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/symbol/key-for
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/object/get-own-property-symbols
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/math/to-string-tag

Basic example:

let Person = (() => {
  let NAME = Symbol('name');
  return class {
    constructor(name) {
      this[NAME] = name;
    }
    getName() {
      return this[NAME];
    }
  }
})();

let person = new Person('Vasya');
console.log(person.getName());            // => 'Vasya'
console.log(person['name']);              // => undefined
console.log(person[Symbol('name')]);      // => undefined, symbols are uniq
for (let key in person) console.log(key); // => nothing, symbols are not enumerable

Symbol.for & Symbol.keyFor example:

let symbol = Symbol.for('key');
symbol === Symbol.for('key'); // true
Symbol.keyFor(symbol);        // 'key'

Example with methods for getting own object keys:

let object = { a: 1 };
Object.defineProperty(object, 'b', { value: 2 });
object[Symbol('c')] = 3;
Object.keys(object);                  // => ['a']
Object.getOwnPropertyNames(object);   // => ['a', 'b']
Object.getOwnPropertySymbols(object); // => [Symbol(c)]
Reflect.ownKeys(object);              // => ['a', 'b', Symbol(c)]

Symbol#description getter:

Symbol('foo').description; // => 'foo'
Symbol().description;      // => undefined
Caveats when using Symbol polyfill:
  • We can't add a new primitive type, Symbol returns an object.
  • Symbol.for and Symbol.keyFor can't be polyfilled cross-realm.
  • By default, to hide the keys, Symbol polyfill defines a setter in Object.prototype. For this reason, an uncontrolled creation of symbols can cause a memory leak and the in operator is not working correctly with Symbol polyfill: Symbol() in {} // => true.

You can disable defining setters in Object.prototype. Example:

Symbol.useSimple();
let symbol1 = Symbol('symbol1');
let object1 = {};
object1[symbol1] = true;
for (let key in object1) console.log(key); // => 'Symbol(symbol1)_t.qamkg9f3q', w/o native Symbol

Symbol.useSetter();
let symbol2 = Symbol('symbol2');
let object2 = {};
object2[symbol2] = true;
for (let key in object2) console.log(key); // nothing
  • Currently, @devtea2025/quas-nobis-earum-officiis does not add setters to Object.prototype for well-known symbols for correct work something like Symbol.iterator in foo. It can cause problems with their enumerability.
  • Some problems are possible with environment exotic objects (for example, IE localStorage).

ECMAScript: Collections

@devtea2025/quas-nobis-earum-officiis uses native collections in most cases, just fixes methods / constructor, if it's required, and in the old environment uses fast polyfill (O(1) lookup).

Map

Modules es.map and es.map.group-by.

class Map {
  constructor(iterable?: Iterable<[key, value]>): Map;
  clear(): void;
  delete(key: any): boolean;
  forEach(callbackfn: (value: any, key: any, target: any) => void, thisArg: any): void;
  get(key: any): any;
  has(key: any): boolean;
  set(key: any, val: any): this;
  values(): Iterator<value>;
  keys(): Iterator<key>;
  entries(): Iterator<[key, value]>;
  @@iterator(): Iterator<[key, value]>;
  readonly attribute size: number;
  static groupBy(items: Iterable, callbackfn: (value: any, index: number) => key): Map<key, Array<mixed>>;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/map
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/map/group-by

Examples:

let array = [1];

let map = new Map([['a', 1], [42, 2]]);
map.set(array, 3).set(true, 4);

console.log(map.size);        // => 4
console.log(map.has(array));  // => true
console.log(map.has([1]));    // => false
console.log(map.get(array));  // => 3
map.forEach((val, key) => {
  console.log(val);           // => 1, 2, 3, 4
  console.log(key);           // => 'a', 42, [1], true
});
map.delete(array);
console.log(map.size);        // => 3
console.log(map.get(array));  // => undefined
console.log(Array.from(map)); // => [['a', 1], [42, 2], [true, 4]]

let map = new Map([['a', 1], ['b', 2], ['c', 3]]);

for (let [key, value] of map) {
  console.log(key);                                 // => 'a', 'b', 'c'
  console.log(value);                               // => 1, 2, 3
}
for (let value of map.values()) console.log(value); // => 1, 2, 3
for (let key of map.keys()) console.log(key);       // => 'a', 'b', 'c'
for (let [key, value] of map.entries()) {
  console.log(key);                                 // => 'a', 'b', 'c'
  console.log(value);                               // => 1, 2, 3
}

const map = Map.groupBy([1, 2, 3, 4, 5], it => it % 2);
map.get(1); // => [1, 3, 5]
map.get(0); // => [2, 4]

Set

Modules es.set, es.set.difference.v2, es.set.intersection.v2, es.set.is-disjoint-from.v2, es.set.is-subset-of.v2, es.set.is-superset-of.v2, es.set.symmetric-difference.v2, es.set.union.v2

class Set {
  constructor(iterable?: Iterable<value>): Set;
  add(key: any): this;
  clear(): void;
  delete(key: any): boolean;
  forEach((value: any, key: any, target: any) => void, thisArg: any): void;
  has(key: any): boolean;
  values(): Iterator<value>;
  keys(): Iterator<value>;
  entries(): Iterator<[value, value]>;
  difference(other: SetLike<mixed>): Set;
  intersection(other: SetLike<mixed>): Set;
  isDisjointFrom(other: SetLike<mixed>): boolean;
  isSubsetOf(other: SetLike<mixed>): boolean;
  isSupersetOf(other: SetLike<mixed>): boolean;
  symmetricDifference(other: SetLike<mixed>): Set;
  union(other: SetLike<mixed>): Set;
  @@iterator(): Iterator<value>;
  readonly attribute size: number;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/set
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/set/difference
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/set/intersection
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/set/is-disjoint-from
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/set/is-subset-of
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/set/is-superset-of
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/set/symmetric-difference
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/set/union

Examples:

let set = new Set(['a', 'b', 'a', 'c']);
set.add('d').add('b').add('e');
console.log(set.size);        // => 5
console.log(set.has('b'));    // => true
set.forEach(it => {
  console.log(it);            // => 'a', 'b', 'c', 'd', 'e'
});
set.delete('b');
console.log(set.size);        // => 4
console.log(set.has('b'));    // => false
console.log(Array.from(set)); // => ['a', 'c', 'd', 'e']

let set = new Set([1, 2, 3, 2, 1]);

for (let value of set) console.log(value);          // => 1, 2, 3
for (let value of set.values()) console.log(value); // => 1, 2, 3
for (let key of set.keys()) console.log(key);       // => 1, 2, 3
for (let [key, value] of set.entries()) {
  console.log(key);                                 // => 1, 2, 3
  console.log(value);                               // => 1, 2, 3
}

new Set([1, 2, 3]).union(new Set([3, 4, 5]));               // => Set {1, 2, 3, 4, 5}
new Set([1, 2, 3]).intersection(new Set([3, 4, 5]));        // => Set {3}
new Set([1, 2, 3]).difference(new Set([3, 4, 5]));          // => Set {1, 2}
new Set([1, 2, 3]).symmetricDifference(new Set([3, 4, 5])); // => Set {1, 2, 4, 5}
new Set([1, 2, 3]).isDisjointFrom(new Set([4, 5, 6]));      // => true
new Set([1, 2, 3]).isSubsetOf(new Set([5, 4, 3, 2, 1]));    // => true
new Set([5, 4, 3, 2, 1]).isSupersetOf(new Set([1, 2, 3]));  // => true

WeakMap

Module es.weak-map.

class WeakMap {
  constructor(iterable?: Iterable<[key, value]>): WeakMap;
  delete(key: Object): boolean;
  get(key: Object): any;
  has(key: Object): boolean;
  set(key: Object, val: any): this;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/weak-map

Examples:

let a = [1];
let b = [2];
let c = [3];

let weakmap = new WeakMap([[a, 1], [b, 2]]);
weakmap.set(c, 3).set(b, 4);
console.log(weakmap.has(a));   // => true
console.log(weakmap.has([1])); // => false
console.log(weakmap.get(a));   // => 1
weakmap.delete(a);
console.log(weakmap.get(a));   // => undefined

// Private properties store:
let Person = (() => {
  let names = new WeakMap;
  return class {
    constructor(name) {
      names.set(this, name);
    }
    getName() {
      return names.get(this);
    }
  }
})();

let person = new Person('Vasya');
console.log(person.getName());            // => 'Vasya'
for (let key in person) console.log(key); // => only 'getName'

WeakSet

Module es.weak-set.

class WeakSet {
  constructor(iterable?: Iterable<value>): WeakSet;
  add(key: Object): this;
  delete(key: Object): boolean;
  has(key: Object): boolean;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/weak-set

Examples:

let a = [1];
let b = [2];
let c = [3];

let weakset = new WeakSet([a, b, a]);
weakset.add(c).add(b).add(c);
console.log(weakset.has(b));   // => true
console.log(weakset.has([2])); // => false
weakset.delete(b);
console.log(weakset.has(b));   // => false

[!WARNING]

  • Weak-collections polyfill stores values as hidden properties of keys. It works correctly and does not leak in most cases. However, it is desirable to store a collection longer than its keys.
  • Native symbols as WeakMap keys can't be properly polyfilled without memory leaks.

ECMAScript: Typed Arrays

Implementations and fixes for ArrayBuffer, DataView, Typed Arrays constructors, static and prototype methods. Typed arrays work only in environments with support descriptors (IE9+), ArrayBuffer and DataView should work anywhere.

Modules es.array-buffer.constructor, es.array-buffer.is-view, esnext.array-buffer.detached, es.array-buffer.slice, esnext.array-buffer.transfer, esnext.array-buffer.transfer-to-fixed-length es.data-view, es.typed-array.int8-array, es.typed-array.uint8-array, es.typed-array.uint8-clamped-array, es.typed-array.int16-array, es.typed-array.uint16-array, es.typed-array.int32-array, es.typed-array.uint32-array, es.typed-array.float32-array, es.typed-array.float64-array, es.typed-array.copy-within, es.typed-array.every, es.typed-array.fill, es.typed-array.filter, es.typed-array.find, es.typed-array.find-index, es.typed-array.find-last, es.typed-array.find-last-index, es.typed-array.for-each, es.typed-array.from, es.typed-array.includes, es.typed-array.index-of, es.typed-array.iterator, es.typed-array.last-index-of, es.typed-array.map, es.typed-array.of, es.typed-array.reduce, es.typed-array.reduce-right, es.typed-array.reverse, es.typed-array.set, es.typed-array.slice, es.typed-array.some, es.typed-array.sort, es.typed-array.subarray, es.typed-array.to-locale-string, es.typed-array.to-string, es.typed-array.at, es.typed-array.to-reversed, es.typed-array.to-sorted, es.typed-array.with.

class ArrayBuffer {
  constructor(length: any): ArrayBuffer;
  readonly attribute byteLength: number;
  readonly attribute detached: boolean;
  slice(start: any, end: any): ArrayBuffer;
  transfer(newLength?: number): ArrayBuffer;
  transferToFixedLength(newLength?: number): ArrayBuffer;
  static isView(arg: any): boolean;
}

class DataView {
  constructor(buffer: ArrayBuffer, byteOffset?: number, byteLength?: number): DataView;
  getInt8(offset: any): int8;
  getUint8(offset: any): uint8
  getInt16(offset: any, littleEndian?: boolean = false): int16;
  getUint16(offset: any, littleEndian?: boolean = false): uint16;
  getInt32(offset: any, littleEndian?: boolean = false): int32;
  getUint32(offset: any, littleEndian?: boolean = false): uint32;
  getFloat32(offset: any, littleEndian?: boolean = false): float32;
  getFloat64(offset: any, littleEndian?: boolean = false): float64;
  setInt8(offset: any, value: any): void;
  setUint8(offset: any, value: any): void;
  setInt16(offset: any, value: any, littleEndian?: boolean = false): void;
  setUint16(offset: any, value: any, littleEndian?: boolean = false): void;
  setInt32(offset: any, value: any, littleEndian?: boolean = false): void;
  setUint32(offset: any, value: any, littleEndian?: boolean = false): void;
  setFloat32(offset: any, value: any, littleEndian?: boolean = false): void;
  setFloat64(offset: any, value: any, littleEndian?: boolean = false): void;
  readonly attribute buffer: ArrayBuffer;
  readonly attribute byteLength: number;
  readonly attribute byteOffset: number;
}

class [
  Int8Array,
  Uint8Array,
  Uint8ClampedArray,
  Int16Array,
  Uint16Array,
  Int32Array,
  Uint32Array,
  Float32Array,
  Float64Array,
] extends %TypedArray% {
  constructor(length: number): %TypedArray%;
  constructor(object: %TypedArray% | Iterable | ArrayLike): %TypedArray%;
  constructor(buffer: ArrayBuffer, byteOffset?: number, length?: number): %TypedArray%
}

class %TypedArray% {
  at(index: int): number;
  copyWithin(target: number, start: number, end?: number): this;
  entries(): Iterator<[index, value]>;
  every(callbackfn: (value: number, index: number, target: %TypedArray%) => boolean, thisArg?: any): boolean;
  fill(value: number, start?: number, end?: number): this;
  filter(callbackfn: (value: number, index: number, target: %TypedArray%) => boolean, thisArg?: any): %TypedArray%;
  find(callbackfn: (value: number, index: number, target: %TypedArray%) => boolean), thisArg?: any): any;
  findIndex(callbackfn: (value: number, index: number, target: %TypedArray%) => boolean, thisArg?: any): uint;
  findLast(callbackfn: (value: any, index: number, target: %TypedArray%) => boolean, thisArg?: any): any;
  findLastIndex(callbackfn: (value: any, index: number, target: %TypedArray%) => boolean, thisArg?: any): uint;
  forEach(callbackfn: (value: number, index: number, target: %TypedArray%) => void, thisArg?: any): void;
  includes(searchElement: any, from?: number): boolean;
  indexOf(searchElement: any, from?: number): number;
  join(separator: string = ','): string;
  keys(): Iterator<index>;
  lastIndexOf(searchElement: any, from?: number): number;
  map(mapFn: (value: number, index: number, target: %TypedArray%) => number, thisArg?: any): %TypedArray%;
  reduce(callbackfn: (memo: any, value: number, index: number, target: %TypedArray%) => any, initialValue?: any): any;
  reduceRight(callbackfn: (memo: any, value: number, index: number, target: %TypedArray%) => any, initialValue?: any): any;
  reverse(): this;
  set(array: ArrayLike, offset?: number): void;
  slice(start?: number, end?: number): %TypedArray%;
  some(callbackfn: (value: number, index: number, target: %TypedArray%) => boolean, thisArg?: any): boolean;
  sort(comparefn?: (a: number, b: number) => number): this; // with modern behavior like stable sort
  subarray(begin?: number, end?: number): %TypedArray%;
  toReversed(): %TypedArray%;
  toSorted(comparefn?: (a: any, b: any) => number): %TypedArray%;
  toString(): string;
  toLocaleString(): string;
  values(): Iterator<value>;
  with(index: includes, value: any): %TypedArray%;
  @@iterator(): Iterator<value>;
  readonly attribute buffer: ArrayBuffer;
  readonly attribute byteLength: number;
  readonly attribute byteOffset: number;
  readonly attribute length: number;
  BYTES_PER_ELEMENT: number;
  static from(items: Iterable | ArrayLike, mapFn?: (value: any, index: number) => any, thisArg?: any): %TypedArray%;
  static of(...args: Array<mixed>): %TypedArray%;
  static BYTES_PER_ELEMENT: number;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/array-buffer
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/array-buffer/constructor
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/array-buffer/is-view
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/array-buffer/detached
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/array-buffer/slice
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/array-buffer/transfer
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/array-buffer/transfer-to-fixed-length
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/data-view
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/int8-array
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/uint8-array
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/uint8-clamped-array
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/int16-array
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/uint16-array
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/int32-array
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/uint32-array
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/float32-array
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/float64-array
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/at
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/copy-within
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/entries
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/every
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/fill
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/filter
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/find
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/find-index
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/find-last
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/find-last-index
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/for-each
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/from
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/includes
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/index-of
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/iterator
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/join
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/keys
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/last-index-of
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/map
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/of
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/reduce
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/reduce-right
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/reverse
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/set
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/slice
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/some
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/sort
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/subarray
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/to-locale-string
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/to-reversed
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/to-sorted
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/to-string
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/values
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/with

Examples:

new Int32Array(4);                          // => [0, 0, 0, 0]
new Uint8ClampedArray([1, 2, 3, 666]);      // => [1, 2, 3, 255]
new Float32Array(new Set([1, 2, 3, 2, 1])); // => [1, 2, 3]

let buffer = new ArrayBuffer(8);
let view   = new DataView(buffer);
view.setFloat64(0, 123.456, true);
new Uint8Array(buffer.slice(4)); // => [47, 221, 94, 64]

Int8Array.of(1, 1.5, 5.7, 745);      // => [1, 1, 5, -23]
Uint8Array.from([1, 1.5, 5.7, 745]); // => [1, 1, 5, 233]

let typed = new Uint8Array([1, 2, 3]);

let a = typed.slice(1);    // => [2, 3]
typed.buffer === a.buffer; // => false
let b = typed.subarray(1); // => [2, 3]
typed.buffer === b.buffer; // => true

typed.filter(it => it % 2); // => [1, 3]
typed.map(it => it * 1.5);  // => [1, 3, 4]

for (let value of typed) console.log(value);          // => 1, 2, 3
for (let value of typed.values()) console.log(value); // => 1, 2, 3
for (let key of typed.keys()) console.log(key);       // => 0, 1, 2
for (let [key, value] of typed.entries()) {
  console.log(key);                                   // => 0, 1, 2
  console.log(value);                                 // => 1, 2, 3
}

new Int32Array([1, 2, 3]).at(1);  // => 2
new Int32Array([1, 2, 3]).at(-1); // => 3

buffer = Int8Array.of(1, 2, 3, 4, 5, 6, 7, 8).buffer;
console.log(buffer.byteLength); // => 8
console.log(buffer.detached); // => false
const newBuffer = buffer.transfer(4);
console.log(buffer.byteLength); // => 0
console.log(buffer.detached); // => true
console.log(newBuffer.byteLength); // => 4
console.log(newBuffer.detached); // => false
console.log([...new Int8Array(newBuffer)]); // => [1, 2, 3, 4]

[!WARNING]

  • Polyfills of Typed Arrays constructors work completely how they should work by the spec. Still, because of the internal usage of getters / setters on each instance, they are slow and consume significant memory. However, polyfills of Typed Arrays constructors are required mainly for old IE, all modern engines have native Typed Arrays constructors and require only fixes of constructors and polyfills of methods.
  • ArrayBuffer.prototype.{ transfer, transferToFixedLength } polyfilled only in runtime with native structuredClone with ArrayBuffer transfer or MessageChannel support.

ECMAScript: Reflect

Modules es.reflect.apply, es.reflect.construct, es.reflect.define-property, es.reflect.delete-property, es.reflect.get, es.reflect.get-own-property-descriptor, es.reflect.get-prototype-of, es.reflect.has, es.reflect.is-extensible, es.reflect.own-keys, es.reflect.prevent-extensions, es.reflect.set, es.reflect.set-prototype-of.

namespace Reflect {
  apply(target: Function, thisArgument: any, argumentsList: Array<mixed>): any;
  construct(target: Function, argumentsList: Array<mixed>, newTarget?: Function): Object;
  defineProperty(target: Object, propertyKey: PropertyKey, attributes: PropertyDescriptor): boolean;
  deleteProperty(target: Object, propertyKey: PropertyKey): boolean;
  get(target: Object, propertyKey: PropertyKey, receiver?: any): any;
  getOwnPropertyDescriptor(target: Object, propertyKey: PropertyKey): PropertyDescriptor | void;
  getPrototypeOf(target: Object): Object | null;
  has(target: Object, propertyKey: PropertyKey): boolean;
  isExtensible(target: Object): boolean;
  ownKeys(target: Object): Array<string | symbol>;
  preventExtensions(target: Object): boolean;
  set(target: Object, propertyKey: PropertyKey, V: any, receiver?: any): boolean;
  setPrototypeOf(target: Object, proto: Object | null): boolean; // required __proto__ - IE11+
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/reflect
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/reflect/apply
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/reflect/construct
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/reflect/define-property
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/reflect/delete-property
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/reflect/get
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/reflect/get-own-property-descriptor
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/reflect/get-prototype-of
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/reflect/has
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/reflect/is-extensible
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/reflect/own-keys
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/reflect/prevent-extensions
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/reflect/set
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/reflect/set-prototype-of

Examples:

let object = { a: 1 };
Object.defineProperty(object, 'b', { value: 2 });
object[Symbol('c')] = 3;
Reflect.ownKeys(object); // => ['a', 'b', Symbol(c)]

function C(a, b) {
  this.c = a + b;
}

let instance = Reflect.construct(C, [20, 22]);
instance.c; // => 42

ECMAScript: JSON

Since JSON object is missed only in very old engines like IE7-, @devtea2025/quas-nobis-earum-officiis does not provide a full JSON polyfill, however, fix already existing implementations by the current standard, for example, well-formed JSON.stringify. JSON is also fixed in other modules - for example, Symbol polyfill fixes JSON.stringify for correct work with symbols.

Module es.json.to-string-tag and es.json.stringify.

namespace JSON {
  stringify(value: any, replacer?: Array<string | number> | (this: any, key: string, value: any) => any, space?: string | number): string | void;
  @@toStringTag: 'JSON';
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/json/stringify
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/json/to-string-tag

Examples:

JSON.stringify({ '𠮷': ['\uDF06\uD834'] }); // => '{"𠮷":["\\udf06\\ud834"]}'

ECMAScript: globalThis

Module es.global-this.

let globalThis: GlobalThisValue;

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/global-this

Examples:

globalThis.Array === Array; // => true

ECMAScript proposals

The TC39 process.

Finished proposals

Finished (stage 4) proposals already marked in @devtea2025/quas-nobis-earum-officiis as stable ECMAScript, they are available in @devtea2025/quas-nobis-earum-officiis/stable and @devtea2025/quas-nobis-earum-officiis/es namespace, you can find them in related sections of the README. However, even for finished proposals, @devtea2025/quas-nobis-earum-officiis provides a way to include only features for a specific proposal like @devtea2025/quas-nobis-earum-officiis/proposals/proposal-name.

let globalThis: Object;

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/global-this
class Array {
  at(index: int): any;
}

class String {
  at(index: int): string;
}

class %TypedArray% {
  at(index: int): number;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/relative-indexing-method
class Array {
  includes(searchElement: any, from?: number): boolean;
}

class %TypedArray% {
  includes(searchElement: any, from?: number): boolean;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/array-includes
class Array {
  flat(depthArg?: number = 1): Array<mixed>;
  flatMap(mapFn: (value: any, index: number, target: any) => any, thisArg: any): Array<mixed>;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/array-flat-map
class Array {
  findLast(callbackfn: (value: any, index: number, target: any) => boolean, thisArg?: any): any;
  findLastIndex(callbackfn: (value: any, index: number, target: any) => boolean, thisArg?: any): uint;
}

class %TypedArray% {
  findLast(callbackfn: (value: any, index: number, target: %TypedArray%) => boolean, thisArg?: any): any;
  findLastIndex(callbackfn: (value: any, index: number, target: %TypedArray%) => boolean, thisArg?: any): uint;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/array-find-from-last
class Array {
  toReversed(): Array<mixed>;
  toSpliced(start?: number, deleteCount?: number, ...items: Array<mixed>): Array<mixed>;
  toSorted(comparefn?: (a: any, b: any) => number): Array<mixed>;
  with(index: includes, value: any): Array<mixed>;
}

class %TypedArray% {
  toReversed(): %TypedArray%;
  toSorted(comparefn?: (a: any, b: any) => number): %TypedArray%;
  with(index: includes, value: any): %TypedArray%;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/change-array-by-copy-stage-4
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/to-reversed
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/to-sorted
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/to-spliced
@devtea2025/quas-nobis-earum-officiis(-pure)/es|stable|actual|full/array(/virtual)/with
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/to-reversed
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/to-sorted
@devtea2025/quas-nobis-earum-officiis/es|stable|actual|full/typed-array/with
class Object {
  static groupBy(items: Iterable, callbackfn: (value: any, index: number) => key): { [key]: Array<mixed> };
}

class Map {
  static groupBy(items: Iterable, callbackfn: (value: any, index: number) => key): Map<key, Array<mixed>>;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/array-grouping-v2
class ArrayBuffer {
  readonly attribute detached: boolean;
  transfer(newLength?: number): ArrayBuffer;
  transferToFixedLength(newLength?: number): ArrayBuffer;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/array-buffer-transfer
class Object {
  static entries(object: Object): Array<[string, mixed]>;
  static values(object: any): Array<mixed>;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/object-values-entries
class Object {
  static fromEntries(iterable: Iterable<[key, value]>): Object;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/object-from-entries
class Object {
  static getOwnPropertyDescriptors(object: any): { [property: PropertyKey]: PropertyDescriptor };
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/object-getownpropertydescriptors
class Object {
  static hasOwn(object: object, key: PropertyKey): boolean;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/accessible-object-hasownproperty
class String {
  padStart(length: number, fillStr?: string = ' '): string;
  padEnd(length: number, fillStr?: string = ' '): string;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/string-padding
class String {
  matchAll(regexp: RegExp): Iterator;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/string-match-all
class String {
  replaceAll(searchValue: string | RegExp, replaceString: string | (searchValue, index, this) => string): string;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/string-replace-all-stage-4
class String {
  trimLeft(): string;
  trimRight(): string;
  trimStart(): string;
  trimEnd(): string;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/string-left-right-trim
// patched for support `RegExp` dotAll (`s`) flag:
class RegExp {
  constructor(pattern: RegExp | string, flags?: string): RegExp;
  exec(): Array<string | undefined> | null;
  readonly attribute dotAll: boolean;
  readonly attribute flags: string;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/regexp-dotall-flag
// patched for support `RegExp` named capture groups:
class RegExp {
  constructor(pattern: RegExp | string, flags?: string): RegExp;
  exec(): Array<string | undefined> | null;
  @@replace(string: string, replaceValue: Function | string): string;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/regexp-named-groups
class Promise {
  static allSettled(iterable: Iterable): Promise;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/promise-all-settled
class AggregateError {
  constructor(errors: Iterable, message: string): AggregateError;
  errors: Array<any>;
  message: string;
}

class Promise {
  static any(promises: Iterable): Promise<any>;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/promise-any
class Promise {
  finally(onFinally: Function): Promise;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/promise-finally
class Promise {
  static withResolvers(): { promise: Promise, resolve: function, reject: function };
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/promise-with-resolvers
class Symbol {
  static asyncIterator: @@asyncIterator;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/async-iteration
class Symbol {
  readonly attribute description: string | void;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/symbol-description
namespace JSON {
  stringify(target: any, replacer?: Function | Array, space?: string | number): string | void;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/well-formed-stringify
class String {
  isWellFormed(): boolean;
  toWellFormed(): string;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/well-formed-unicode-strings
class Set {
  difference(other: SetLike<mixed>): Set;
  intersection(other: SetLike<mixed>): Set;
  isDisjointFrom(other: SetLike<mixed>): boolean;
  isSubsetOf(other: SetLike<mixed>): boolean;
  isSupersetOf(other: SetLike<mixed>): boolean;
  symmetricDifference(other: SetLike<mixed>): Set;
  union(other: SetLike<mixed>): Set;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/set-methods-v2

Stage 3 proposals

@devtea2025/quas-nobis-earum-officiis/stage/3 entry point contains only stage 3 proposals, @devtea2025/quas-nobis-earum-officiis/stage/2.7 - stage 2.7 and stage 3, etc.

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/stage/3

Modules esnext.iterator.constructor, esnext.iterator.drop, esnext.iterator.every, esnext.iterator.filter, esnext.iterator.find, esnext.iterator.flat-map, esnext.iterator.for-each, esnext.iterator.from, esnext.iterator.map, esnext.iterator.reduce, esnext.iterator.some, esnext.iterator.take, esnext.iterator.to-array

class Iterator {
  static from(iterable: Iterable<any> | Iterator<any>): Iterator<any>;
  drop(limit: uint): Iterator<any>;
  every(callbackfn: (value: any, counter: uint) => boolean): boolean;
  filter(callbackfn: (value: any, counter: uint) => boolean): Iterator<any>;
  find(callbackfn: (value: any, counter: uint) => boolean)): any;
  flatMap(callbackfn: (value: any, counter: uint) => Iterable<any> | Iterator<any>): Iterator<any>;
  forEach(callbackfn: (value: any, counter: uint) => void): void;
  map(callbackfn: (value: any, counter: uint) => any): Iterator<any>;
  reduce(callbackfn: (memo: any, value: any, counter: uint) => any, initialValue: any): any;
  some(callbackfn: (value: any, counter: uint) => boolean): boolean;
  take(limit: uint): Iterator<any>;
  toArray(): Array<any>;
  @@toStringTag: 'Iterator'
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/iterator-helpers-stage-3-2
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/iterator
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/iterator/drop
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/iterator/every
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/iterator/filter
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/iterator/find
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/iterator/flat-map
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/iterator/for-each
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/iterator/from
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/iterator/map
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/iterator/reduce
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/iterator/some
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/iterator/take
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/iterator/to-array

Examples:

[1, 2, 3, 4, 5, 6, 7].values()
  .drop(1)
  .take(5)
  .filter(it => it % 2)
  .map(it => it ** 2)
  .toArray(); // => [9, 25]

Iterator.from({
  next: () => ({ done: Math.random() > .9, value: Math.random() * 10 | 0 })
}).toArray(); // => [7, 6, 3, 0, 2, 8]

[!WARNING]

  • For preventing prototype pollution, in the pure version, new %IteratorPrototype% methods are not added to the real %IteratorPrototype%, they are available only on wrappers - instead of [].values().map(fn) use Iterator.from([]).map(fn).

Modules esnext.array.from-async.

class Array {
  static fromAsync(asyncItems: AsyncIterable | Iterable | ArrayLike, mapfn?: (value: any, index: number) => any, thisArg?: any): Array;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/array-from-async-stage-2
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/array/from-async

Example:

await Array.fromAsync((async function * (){ yield * [1, 2, 3] })(), i => i * i); // => [1, 4, 9]

Modules esnext.json.is-raw-json, esnext.json.parse, esnext.json.raw-json.

namespace JSON {
  isRawJSON(O: any): boolean;
  // patched for source support
  parse(text: string, reviver?: (this: any, key: string, value: any, context: { source?: string }) => any): any;
  rawJSON(text: any): RawJSON;
  // patched for `JSON.rawJSON` support
  stringify(value: any, replacer?: Array<string | number> | (this: any, key: string, value: any) => any, space?: string | number): string | void;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/json-parse-with-source
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/json/is-raw-json
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/json/parse
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/json/raw-json
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/json/stringify

Examples:

function digitsToBigInt(key, val, { source }) {
  return /^[0-9]+$/.test(source) ? BigInt(source) : val;
}

function bigIntToRawJSON(key, val) {
  return typeof val === "bigint" ? JSON.rawJSON(String(val)) : val;
}

const tooBigForNumber = BigInt(Number.MAX_SAFE_INTEGER) + 2n;
JSON.parse(String(tooBigForNumber), digitsToBigInt) === tooBigForNumber; // true

const wayTooBig = BigInt("1" + "0".repeat(1000));
JSON.parse(String(wayTooBig), digitsToBigInt) === wayTooBig; // true

const embedded = JSON.stringify({ tooBigForNumber }, bigIntToRawJSON);
embedded === '{"tooBigForNumber":9007199254740993}'; // true

Modules esnext.data-view.get-float16, esnext.data-view.set-float16 and esnext.math.f16round

class DataView {
  getFloat16(offset: any): number
  setFloat16(offset: any, value: any): void;
}

namespace Math {
  fround(number: any): number;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/float16
@devtea2025/quas-nobis-earum-officiis/actual|full/dataview/get-float16
@devtea2025/quas-nobis-earum-officiis/actual|full/dataview/set-float16
@devtea2025/quas-nobis-earum-officiis/actual|full/math/f16round

Examples:

console.log(Math.f16round(1.337)); // => 1.3369140625

const view = new DataView(new ArrayBuffer(2));
view.setFloat16(0, 1.337);
console.log(view.getFloat16(0)); // => 1.3369140625

Modules esnext.uint8-array.from-base64, esnext.uint8-array.from-hex, esnext.uint8-array.to-base64, esnext.uint8-array.to-hex.

class Uint8Array {
  static fromBase64(string, options?: { alphabet?: 'base64' | 'base64url', strict?: boolean }): Uint8Array;
  static fromHex(string): Uint8Array;
  toBase64(options?: { alphabet?: 'base64' | 'base64url' }): string;
  toHex(): string;
}
[*CommonJS entry points:*](#commonjs-api)
```js
@devtea2025/quas-nobis-earum-officiis/proposals/array-buffer-base64
@devtea2025/quas-nobis-earum-officiis(-pure)/full/typed-array/from-base64
@devtea2025/quas-nobis-earum-officiis(-pure)/full/typed-array/from-hex
@devtea2025/quas-nobis-earum-officiis(-pure)/full/typed-array/to-base64
@devtea2025/quas-nobis-earum-officiis(-pure)/full/typed-array/to-hex

Example:

let arr = new Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100]);
console.log(arr.toBase64()); // => 'SGVsbG8gV29ybGQ='
console.log(arr.toHex()); // => '48656c6c6f20576f726c64'
console.log(Uint8Array.fromBase64('SGVsbG8gV29ybGQ=')); // => Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100])
console.log(Uint8Array.fromHex('48656c6c6f20576f726c64')); // => Uint8Array([72, 101, 108, 108, 111, 32, 87, 111, 114, 108, 100])

[!NOTE] This is only built-ins for this proposal, using syntax support requires transpiler support.

Modules esnext.symbol.dispose, esnext.disposable-stack.constructor, esnext.suppressed-error.constructor, esnext.iterator.dispose, esnext.symbol.async-dispose, esnext.async-disposable-stack.constructor, esnext.async-iterator.async-dispose.

class Symbol {
  static asyncDispose: @@asyncDispose;
  static dispose: @@dispose;
}

class DisposableStack {
  constructor(): DisposableStack;
  dispose(): undefined;
  use(value: Disposable): value;
  adopt(value: object, onDispose: Function): value;
  defer(onDispose: Function): undefined;
  @@dispose(): undefined;
  @@toStringTag: 'DisposableStack';
}

class AsyncDisposableStack {
  constructor(): AsyncDisposableStack;
  disposeAsync(): Promise<undefined>;
  use(value: AsyncDisposable | Disposable): value;
  adopt(value: object, onDispose: Function): value;
  defer(onDispose: Function): undefined;
  @@asyncDispose(): Promise<undefined>;
  @@toStringTag: 'AsyncDisposableStack';
}

class SuppressedError extends Error {
  constructor(error: any, suppressed: any, message?: string): SuppressedError;
  error: any;
  suppressed: any;
  message: string;
  cause: any;
}

class Iterator {
  @@dispose(): undefined;
}

class AsyncIterator {
  @@asyncDispose(): Promise<undefined>;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/explicit-resource-management
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/symbol/async-dispose
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/symbol/dispose
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/disposable-stack
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/async-disposable-stack
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/suppressed-error
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/iterator/dispose
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/async-iterator/async-dispose

Modules esnext.symbol.metadata and esnext.function.metadata.

class Symbol {
  static metadata: @@metadata;
}

class Function {
  @@metadata: null;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/decorator-metadata-v2
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/symbol/metadata
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/function/metadata

Stage 2.7 proposals

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/stage/2.7

Module esnext.promise.try

class Promise {
  static try(callbackfn: Function): Promise;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/promise-try
@devtea2025/quas-nobis-earum-officiis(-pure)/full/promise/try

Examples:

Promise.try(() => 42).then(it => console.log(`Promise, resolved as ${it}`));

Promise.try(() => { throw 42; }).catch(it => console.log(`Promise, rejected as ${it}`));

Promise.try(async () => 42).then(it => console.log(`Promise, resolved as ${it}`));

Promise.try(async () => { throw 42; }).catch(it => console.log(`Promise, rejected as ${it}`));

Module esnext.math.sum-precise

class Math {
  static sumPrecise(items: Iterable<number>): Number;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/math-sum
@devtea2025/quas-nobis-earum-officiis(-pure)/full/math/sum-precise

Examples:

1e20 + 0.1 + -1e20; // => 0
Math.sumPrecise([1e20, 0.1, -1e20]); // => 0.1

Stage 2 proposals

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/stage/2

Modules esnext.async-iterator.constructor, esnext.async-iterator.drop, esnext.async-iterator.every, esnext.async-iterator.filter, esnext.async-iterator.find, esnext.async-iterator.flat-map, esnext.async-iterator.for-each, esnext.async-iterator.from, esnext.async-iterator.map, esnext.async-iterator.reduce, esnext.async-iterator.some, esnext.async-iterator.take, esnext.async-iterator.to-array, , esnext.iterator.to-async

class Iterator {
  toAsync(): AsyncIterator<any>;
}

class AsyncIterator {
  static from(iterable: AsyncIterable<any> | Iterable<any> | AsyncIterator<any>): AsyncIterator<any>;
  drop(limit: uint): AsyncIterator<any>;
  every(async callbackfn: (value: any, counter: uint) => boolean): Promise<boolean>;
  filter(async callbackfn: (value: any, counter: uint) => boolean): AsyncIterator<any>;
  find(async callbackfn: (value: any, counter: uint) => boolean)): Promise<any>;
  flatMap(async callbackfn: (value: any, counter: uint) => AsyncIterable<any> | Iterable<any> | AsyncIterator<any>): AsyncIterator<any>;
  forEach(async callbackfn: (value: any, counter: uint) => void): Promise<void>;
  map(async callbackfn: (value: any, counter: uint) => any): AsyncIterator<any>;
  reduce(async callbackfn: (memo: any, value: any, counter: uint) => any, initialValue: any): Promise<any>;
  some(async callbackfn: (value: any, counter: uint) => boolean): Promise<boolean>;
  take(limit: uint): AsyncIterator<any>;
  toArray(): Promise<Array>;
  @@toStringTag: 'AsyncIterator'
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/async-iterator-helpers
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/async-iterator
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/async-iterator/drop
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/async-iterator/every
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/async-iterator/filter
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/async-iterator/find
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/async-iterator/flat-map
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/async-iterator/for-each
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/async-iterator/from
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/async-iterator/map
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/async-iterator/reduce
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/async-iterator/some
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/async-iterator/take
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/async-iterator/to-array
@devtea2025/quas-nobis-earum-officiis(-pure)/actual|full/iterator/to-async

Examples:

await AsyncIterator.from([1, 2, 3, 4, 5, 6, 7])
  .drop(1)
  .take(5)
  .filter(it => it % 2)
  .map(it => it ** 2)
  .toArray(); // => [9, 25]

await [1, 2, 3].values().toAsync().map(async it => it ** 2).toArray(); // => [1, 4, 9]
Caveats:
  • For preventing prototypes pollution, in the pure version, new %AsyncIteratorPrototype% methods are not added to the real %AsyncIteratorPrototype%, they available only on wrappers - instead of [].values().toAsync().map(fn) use AsyncIterator.from([]).map(fn).
  • Now, we have access to the real %AsyncIteratorPrototype% only with usage async generators syntax. So, for compatibility of the library with old browsers, we should use Function constructor. However, that breaks compatibility with CSP. So, if you wanna use the real %AsyncIteratorPrototype%, you should set USE_FUNCTION_CONSTRUCTOR option in the @devtea2025/quas-nobis-earum-officiis/configurator to true:
const configurator = require('@devtea2025/quas-nobis-earum-officiis/configurator');

configurator({ USE_FUNCTION_CONSTRUCTOR: true });

require('@devtea2025/quas-nobis-earum-officiis/actual/async-iterator');

(async function * () { /* empty */ })() instanceof AsyncIterator; // => true
  • As an alternative, you could pass to the @devtea2025/quas-nobis-earum-officiis/configurator an object that will be considered as %AsyncIteratorPrototype%:
const configurator = require('@devtea2025/quas-nobis-earum-officiis/configurator');
const { getPrototypeOf } = Object;

configurator({ AsyncIteratorPrototype: getPrototypeOf(getPrototypeOf(getPrototypeOf(async function * () { /* empty */ }()))) });

require('@devtea2025/quas-nobis-earum-officiis/actual/async-iterator');

(async function * () { /* empty */ })() instanceof AsyncIterator; // => true

Module esnext.iterator.range

class Iterator {
  range(start: number, end: number, options: { step: number = 1, inclusive: boolean = false } | step: number = 1): NumericRangeIterator;
  range(start: bigint, end: bigint | Infinity | -Infinity, options: { step: bigint = 1n, inclusive: boolean = false } | step: bigint = 1n): NumericRangeIterator;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/number-range
@devtea2025/quas-nobis-earum-officiis(-pure)/full/iterator/range

Example:

for (const i of Iterator.range(1, 10)) {
  console.log(i); // => 1, 2, 3, 4, 5, 6, 7, 8, 9
}

for (const i of Iterator.range(1, 10, { step: 3, inclusive: true })) {
  console.log(i); // => 1, 4, 7, 10
}

Modules esnext.map.emplace and esnext.weak-map.emplace

class Map {
  emplace(key: any, { update: (value: any, key: any, handler: object) => updated: any, insert: (key: any, handler: object) => value: any): updated | value;
}

class WeakMap {
  emplace(key: any, { update: (value: any, key: any, handler: object) => updated: any, insert: (key: any, handler: object) => value: any): updated | value;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/map-upsert-stage-2
@devtea2025/quas-nobis-earum-officiis(-pure)/full/map/emplace
@devtea2025/quas-nobis-earum-officiis(-pure)/full/weak-map/emplace

Examples:

const map = new Map([['a', 2]]);

map.emplace('a', { update: it => it ** 2, insert: () => 3}); // => 4

map.emplace('b', { update: it => it ** 2, insert: () => 3}); // => 3

console.log(map); // => Map { 'a': 4, 'b': 3 }

Module esnext.array.is-template-object

class Array {
  static isTemplateObject(value: any): boolean
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/array-is-template-object
@devtea2025/quas-nobis-earum-officiis(-pure)/full/array/is-template-object

Example:

console.log(Array.isTemplateObject((it => it)`qwe${ 123 }asd`)); // => true

Module esnext.string.dedent

class String {
  static dedent(templateOrTag: { raw: Array<string> } | function, ...substitutions: Array<string>): string | function;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/string-dedent
@devtea2025/quas-nobis-earum-officiis(-pure)/full/string/dedent

Example:

const message = 42;

console.log(String.dedent`
  print('${ message }')
`); // => print('42')

String.dedent(console.log)`
  print('${ message }')
`; // => ["print('", "')", raw: Array(2)], 42

Module esnext.regexp.escape

class RegExp {
  static escape(value: string): string
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/regexp-escaping
@devtea2025/quas-nobis-earum-officiis(-pure)/full/regexp/escape

Example:

console.log(RegExp.escape('10$')); // => '\\x310\\x24'
console.log(RegExp.escape('abcdefg_123456')); // => 'abcdefg_123456'
console.log(RegExp.escape('(){}[]|,.?*+-^$=<>\\/#&!%:;@~\'"`'));
// => '\\x28\\x29\\x7b\\x7d\\x5b\\x5d\\x7c\\x2c\\x2e\\x3f\\x2a\\x2b\\x2d\\x5e\\x24\\x3d\\x3c\\x3e\\x5c\\x2f\\x23\\x26\\x21\\x25\\x3a\\x3b\\x40\\x7e\\x27\\x22\\x60'
console.log(RegExp.escape('\u0009\u000A\u000B\u000C\u000D\u0020\u00A0\u1680\u2000\u2001\u2002\u2003\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028\u2029\uFEFF'));
// => '\\x09\\x0a\\x0b\\x0c\\x0d\\x20\\xa0\\u1680\\u2000\\u2001\\u2002\\u2003\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200a\\u202f\\u205f\\u3000\\u2028\\u2029\\ufeff'

Modules esnext.symbol.is-registered-symbol, esnext.symbol.is-well-known-symbol.

class Symbol {
  static isRegisteredSymbol(value: any): boolean;
  static isWellKnownSymbol(value: any): boolean;
}
[*CommonJS entry points:*](#commonjs-api)
```js
@devtea2025/quas-nobis-earum-officiis/proposals/symbol-predicates-v2
@devtea2025/quas-nobis-earum-officiis(-pure)/full/symbol/is-registered-symbol
@devtea2025/quas-nobis-earum-officiis(-pure)/full/symbol/is-well-known-symbol

Example:

Symbol.isRegisteredSymbol(Symbol.for('key')); // => true
Symbol.isRegisteredSymbol(Symbol('key')); // => false

Symbol.isWellKnownSymbol(Symbol.iterator); // => true
Symbol.isWellKnownSymbol(Symbol('key')); // => false

Stage 1 proposals

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/stage/1

Modules esnext.observable and esnext.symbol.observable

class Observable {
  constructor(subscriber: Function): Observable;
  subscribe(observer: Function | { next?: Function, error?: Function, complete?: Function }): Subscription;
  @@observable(): this;
  static of(...items: Array<mixed>): Observable;
  static from(x: Observable | Iterable): Observable;
  static readonly attribute @@species: this;
}

class Symbol {
  static observable: @@observable;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/observable
@devtea2025/quas-nobis-earum-officiis(-pure)/full/observable
@devtea2025/quas-nobis-earum-officiis(-pure)/full/symbol/observable

Examples:

new Observable(observer => {
  observer.next('hello');
  observer.next('world');
  observer.complete();
}).subscribe({
  next(it) { console.log(it); },
  complete() { console.log('!'); }
});

Modules esnext.set.add-all, esnext.set.delete-all, esnext.set.every, esnext.set.filter, esnext.set.find, esnext.set.join, esnext.set.map, esnext.set.reduce, esnext.set.some, esnext.map.delete-all, esnext.map.every, esnext.map.filter, esnext.map.find, esnext.map.find-key, esnext.map.includes, esnext.map.key-by, esnext.map.key-of, esnext.map.map-keys, esnext.map.map-values, esnext.map.merge, esnext.map.reduce, esnext.map.some, esnext.map.update, esnext.weak-set.add-all, esnext.weak-set.delete-all, esnext.weak-map.delete-all

Modules esnext.set.of, esnext.set.from, esnext.map.of, esnext.map.from, esnext.weak-set.of, esnext.weak-set.from, esnext.weak-map.of, esnext.weak-map.from

class Set {
  static of(...args: Array<mixed>): Set;
  static from(iterable: Iterable<mixed>, mapFn?: (value: any, index: number) => any, thisArg?: any): Set;
  addAll(...args: Array<mixed>): this;
  deleteAll(...args: Array<mixed>): boolean;
  every(callbackfn: (value: any, key: any, target: any) => boolean, thisArg?: any): boolean;
  filter(callbackfn: (value: any, key: any, target: any) => boolean, thisArg?: any): Set;
  find(callbackfn: (value: any, key: any, target: any) => boolean), thisArg?: any): any;
  join(separator: string = ','): string;
  map(callbackfn: (value: any, key: any, target: any) => any, thisArg?: any): Set;
  reduce(callbackfn: (memo: any, value: any, key: any, target: any) => any, initialValue?: any): any;
  some(callbackfn: (value: any, key: any, target: any) => boolean, thisArg?: any): boolean;
}

class Map {
  static of(...args: Array<[key, value]>): Map;
  static from(iterable: Iterable<mixed>, mapFn?: (value: any, index: number) => [key: any, value: any], thisArg?: any): Map;
  static keyBy(iterable: Iterable<mixed>, callbackfn?: (value: any) => any): Map;
  deleteAll(...args: Array<mixed>): boolean;
  every(callbackfn: (value: any, key: any, target: any) => boolean, thisArg?: any): boolean;
  filter(callbackfn: (value: any, key: any, target: any) => boolean, thisArg?: any): Map;
  find(callbackfn: (value: any, key: any, target: any) => boolean), thisArg?: any): any;
  findKey(callbackfn: (value: any, key: any, target: any) => boolean), thisArg?: any): any;
  includes(searchElement: any): boolean;
  keyOf(searchElement: any): any;
  mapKeys(mapFn: (value: any, index: number, target: any) => any, thisArg?: any): Map;
  mapValues(mapFn: (value: any, index: number, target: any) => any, thisArg?: any): Map;
  merge(...iterables: Array<Iterable>): this;
  reduce(callbackfn: (memo: any, value: any, key: any, target: any) => any, initialValue?: any): any;
  some(callbackfn: (value: any, key: any, target: any) => boolean, thisArg?: any): boolean;
  update(key: any, callbackfn: (value: any, key: any, target: any) => any, thunk?: (key: any, target: any) => any): this;
}

class WeakSet {
  static of(...args: Array<mixed>): WeakSet;
  static from(iterable: Iterable<mixed>, mapFn?: (value: any, index: number) => Object, thisArg?: any): WeakSet;
  addAll(...args: Array<mixed>): this;
  deleteAll(...args: Array<mixed>): boolean;
}

class WeakMap {
  static of(...args: Array<[key, value]>): WeakMap;
  static from(iterable: Iterable<mixed>, mapFn?: (value: any, index: number) => [key: Object, value: any], thisArg?: any): WeakMap;
  deleteAll(...args: Array<mixed>): boolean;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/collection-methods
@devtea2025/quas-nobis-earum-officiis/proposals/collection-of-from
@devtea2025/quas-nobis-earum-officiis(-pure)/full/set/add-all
@devtea2025/quas-nobis-earum-officiis(-pure)/full/set/delete-all
@devtea2025/quas-nobis-earum-officiis(-pure)/full/set/every
@devtea2025/quas-nobis-earum-officiis(-pure)/full/set/filter
@devtea2025/quas-nobis-earum-officiis(-pure)/full/set/find
@devtea2025/quas-nobis-earum-officiis(-pure)/full/set/from
@devtea2025/quas-nobis-earum-officiis(-pure)/full/set/join
@devtea2025/quas-nobis-earum-officiis(-pure)/full/set/map
@devtea2025/quas-nobis-earum-officiis(-pure)/full/set/of
@devtea2025/quas-nobis-earum-officiis(-pure)/full/set/reduce
@devtea2025/quas-nobis-earum-officiis(-pure)/full/set/some
@devtea2025/quas-nobis-earum-officiis(-pure)/full/map/delete-all
@devtea2025/quas-nobis-earum-officiis(-pure)/full/map/every
@devtea2025/quas-nobis-earum-officiis(-pure)/full/map/filter
@devtea2025/quas-nobis-earum-officiis(-pure)/full/map/find
@devtea2025/quas-nobis-earum-officiis(-pure)/full/map/find-key
@devtea2025/quas-nobis-earum-officiis(-pure)/full/map/from
@devtea2025/quas-nobis-earum-officiis(-pure)/full/map/includes
@devtea2025/quas-nobis-earum-officiis(-pure)/full/map/key-by
@devtea2025/quas-nobis-earum-officiis(-pure)/full/map/key-of
@devtea2025/quas-nobis-earum-officiis(-pure)/full/map/map-keys
@devtea2025/quas-nobis-earum-officiis(-pure)/full/map/map-values
@devtea2025/quas-nobis-earum-officiis(-pure)/full/map/merge
@devtea2025/quas-nobis-earum-officiis(-pure)/full/map/of
@devtea2025/quas-nobis-earum-officiis(-pure)/full/map/reduce
@devtea2025/quas-nobis-earum-officiis(-pure)/full/map/some
@devtea2025/quas-nobis-earum-officiis(-pure)/full/map/update
@devtea2025/quas-nobis-earum-officiis(-pure)/full/weak-set/add-all
@devtea2025/quas-nobis-earum-officiis(-pure)/full/weak-set/delete-all
@devtea2025/quas-nobis-earum-officiis(-pure)/full/weak-set/of
@devtea2025/quas-nobis-earum-officiis(-pure)/full/weak-set/from
@devtea2025/quas-nobis-earum-officiis(-pure)/full/weak-map/delete-all
@devtea2025/quas-nobis-earum-officiis(-pure)/full/weak-map/of
@devtea2025/quas-nobis-earum-officiis(-pure)/full/weak-map/from

.of / .from examples:

Set.of(1, 2, 3, 2, 1); // => Set {1, 2, 3}

Map.from([[1, 2], [3, 4]], ([key, value]) => [key ** 2, value ** 2]); // => Map { 1: 4, 9: 16 }

Modules esnext.composite-key and esnext.composite-symbol

function compositeKey(...args: Array<mixed>): object;
function compositeSymbol(...args: Array<mixed>): symbol;

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/keys-composition
@devtea2025/quas-nobis-earum-officiis(-pure)/full/composite-key
@devtea2025/quas-nobis-earum-officiis(-pure)/full/composite-symbol

Examples:

// returns a symbol
const symbol = compositeSymbol({});
console.log(typeof symbol); // => 'symbol'

// works the same, but returns a plain frozen object without a prototype
const key = compositeKey({});
console.log(typeof key); // => 'object'
console.log({}.toString.call(key)); // => '[object Object]'
console.log(Object.getPrototypeOf(key)); // => null
console.log(Object.isFrozen(key)); // => true

const a = ['a'];
const b = ['b'];
const c = ['c'];

console.log(compositeSymbol(a) === compositeSymbol(a)); // => true
console.log(compositeSymbol(a) !== compositeSymbol(['a'])); // => true
console.log(compositeSymbol(a, 1) === compositeSymbol(a, 1)); // => true
console.log(compositeSymbol(a, b) !== compositeSymbol(b, a)); // => true
console.log(compositeSymbol(a, b, c) === compositeSymbol(a, b, c)); // => true
console.log(compositeSymbol(1, a) === compositeSymbol(1, a)); // => true
console.log(compositeSymbol(1, a, 2, b) === compositeSymbol(1, a, 2, b)); // => true
console.log(compositeSymbol(a, a) === compositeSymbol(a, a)); // => true

Modules esnext.array.filter-reject and esnext.typed-array.filter-reject.

class Array {
  filterReject(callbackfn: (value: any, index: number, target: any) => boolean, thisArg?: any): Array<mixed>;
}

class %TypedArray% {
  filterReject(callbackfn: (value: number, index: number, target: %TypedArray%) => boolean, thisArg?: any): %TypedArray%;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/array-filtering-stage-1
@devtea2025/quas-nobis-earum-officiis(-pure)/full/array(/virtual)/filter-reject
@devtea2025/quas-nobis-earum-officiis/full/typed-array/filter-reject

Examples:

[1, 2, 3, 4, 5].filterReject(it => it % 2); // => [2, 4]

Modules esnext.array.unique-by and esnext.typed-array.unique-by

class Array {
  uniqueBy(resolver?: (item: any) => any): Array<mixed>;
}

class %TypedArray% {
  uniqueBy(resolver?: (item: any) => any): %TypedArray%;;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/array-unique
@devtea2025/quas-nobis-earum-officiis(-pure)/full/array(/virtual)/unique-by
@devtea2025/quas-nobis-earum-officiis/full/typed-array/unique-by

Examples:

[1, 2, 3, 2, 1].uniqueBy(); // [1, 2, 3]

[
  { id: 1, uid: 10000 },
  { id: 2, uid: 10000 },
  { id: 3, uid: 10001 }
].uniqueBy(it => it.uid);    // => [{ id: 1, uid: 10000 }, { id: 3, uid: 10001 }]

Modules esnext.data-view.get-uint8-clamped and esnext.data-view.set-uint8-clamped

class DataView {
  getUint8Clamped(offset: any): uint8
  setUint8Clamped(offset: any, value: any): void;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/data-view-get-set-uint8-clamped
@devtea2025/quas-nobis-earum-officiis/full/dataview/get-uint8-clamped
@devtea2025/quas-nobis-earum-officiis/full/dataview/set-uint8-clamped

Examples:

const view = new DataView(new ArrayBuffer(1));
view.setUint8Clamped(0, 100500);
console.log(view.getUint8Clamped(0)); // => 255

Module esnext.number.from-string

class Number {
  fromString(string: string, radix: number): number;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/number-from-string
@devtea2025/quas-nobis-earum-officiis(-pure)/full/number/from-string

Module esnext.string.cooked

class String {
  static cooked(template: Array<string>, ...substitutions: Array<string>): string;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/string-cooked
@devtea2025/quas-nobis-earum-officiis(-pure)/full/string/cooked

Example:

function safePath(strings, ...subs) {
  return String.cooked(strings, ...subs.map(sub => encodeURIComponent(sub)));
}

let id = 'spottie?';

safePath`/cats/${ id }`; // => /cats/spottie%3F

Module esnext.string.code-points

class String {
  codePoints(): Iterator<{ codePoint, position }>;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/string-code-points
@devtea2025/quas-nobis-earum-officiis(-pure)/full/string/code-points

Example:

for (let { codePoint, position } of 'qwe'.codePoints()) {
  console.log(codePoint); // => 113, 119, 101
  console.log(position);  // => 0, 1, 2
}

Module esnext.symbol.custom-matcher.

class Symbol {
  static customMatcher: @@customMatcher;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/pattern-matching-v2
@devtea2025/quas-nobis-earum-officiis(-pure)/full/symbol/custom-matcher

Module esnext.symbol.custom-matcher.

class Symbol {
  static customMatcher: @@customMatcher;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/pattern-extractors
@devtea2025/quas-nobis-earum-officiis(-pure)/full/symbol/custom-matcher

Stage 0 proposals

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/stage/0

Module esnext.function.demethodize

class Function {
  demethodize(): Function;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/function-demethodize
@devtea2025/quas-nobis-earum-officiis(-pure)/full/function/demethodize
@devtea2025/quas-nobis-earum-officiis(-pure)/full/function/virtual/demethodize

Examples:

const slice = Array.prototype.slice.demethodize();

slice([1, 2, 3], 1); // => [2, 3]

Modules esnext.function.is-callable, esnext.function.is-constructor

class Function {
  static isCallable(value: any): boolean;
  static isConstructor(value: any): boolean;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/function-is-callable-is-constructor
@devtea2025/quas-nobis-earum-officiis(-pure)/full/function/is-callable
@devtea2025/quas-nobis-earum-officiis(-pure)/full/function/is-constructor

Examples:

Function.isCallable(null);           // => false
Function.isCallable({});             // => false
Function.isCallable(function () {}); // => true
Function.isCallable(() => {});       // => true
Function.isCallable(class {});       // => false

Function.isConstructor(null);           // => false
Function.isConstructor({});             // => false
Function.isConstructor(function () {}); // => true
Function.isConstructor(() => {});       // => false
Function.isConstructor(class {});       // => true

Pre-stage 0 proposals

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/stage/pre

Modules esnext.reflect.define-metadata, esnext.reflect.delete-metadata, esnext.reflect.get-metadata, esnext.reflect.get-metadata-keys, esnext.reflect.get-own-metadata, esnext.reflect.get-own-metadata-keys, esnext.reflect.has-metadata, esnext.reflect.has-own-metadata and esnext.reflect.metadata.

namespace Reflect {
  defineMetadata(metadataKey: any, metadataValue: any, target: Object, propertyKey?: PropertyKey): void;
  getMetadata(metadataKey: any, target: Object, propertyKey?: PropertyKey): any;
  getOwnMetadata(metadataKey: any, target: Object, propertyKey?: PropertyKey): any;
  hasMetadata(metadataKey: any, target: Object, propertyKey?: PropertyKey): boolean;
  hasOwnMetadata(metadataKey: any, target: Object, propertyKey?: PropertyKey): boolean;
  deleteMetadata(metadataKey: any, target: Object, propertyKey?: PropertyKey): boolean;
  getMetadataKeys(target: Object, propertyKey?: PropertyKey): Array<mixed>;
  getOwnMetadataKeys(target: Object, propertyKey?: PropertyKey): Array<mixed>;
  metadata(metadataKey: any, metadataValue: any): decorator(target: Object, targetKey?: PropertyKey) => void;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/reflect-metadata
@devtea2025/quas-nobis-earum-officiis(-pure)/full/reflect/define-metadata
@devtea2025/quas-nobis-earum-officiis(-pure)/full/reflect/delete-metadata
@devtea2025/quas-nobis-earum-officiis(-pure)/full/reflect/get-metadata
@devtea2025/quas-nobis-earum-officiis(-pure)/full/reflect/get-metadata-keys
@devtea2025/quas-nobis-earum-officiis(-pure)/full/reflect/get-own-metadata
@devtea2025/quas-nobis-earum-officiis(-pure)/full/reflect/get-own-metadata-keys
@devtea2025/quas-nobis-earum-officiis(-pure)/full/reflect/has-metadata
@devtea2025/quas-nobis-earum-officiis(-pure)/full/reflect/has-own-metadata
@devtea2025/quas-nobis-earum-officiis(-pure)/full/reflect/metadata

Examples:

let object = {};
Reflect.defineMetadata('foo', 'bar', object);
Reflect.ownKeys(object);               // => []
Reflect.getOwnMetadataKeys(object);    // => ['foo']
Reflect.getOwnMetadata('foo', object); // => 'bar'

Web standards

self

Spec, module web.self

getter self: GlobalThisValue;

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/stable|actual|full/self

Examples:

self.Array === Array; // => true

structuredClone

Spec, module web.structured-clone

function structuredClone(value: Serializable, { transfer?: Sequence<Transferable> }): any;

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/stable|actual|full/structured-clone

Examples:

const structured = [{ a: 42 }];
const sclone = structuredClone(structured);
console.log(sclone);                      // => [{ a: 42 }]
console.log(structured !== sclone);       // => true
console.log(structured[0] !== sclone[0]); // => true

const circular = {};
circular.circular = circular;
const cclone = structuredClone(circular);
console.log(cclone.circular === cclone);  // => true

structuredClone(42);                                            // => 42
structuredClone({ x: 42 });                                     // => { x: 42 }
structuredClone([1, 2, 3]);                                     // => [1, 2, 3]
structuredClone(new Set([1, 2, 3]));                            // => Set{ 1, 2, 3 }
structuredClone(new Map([['a', 1], ['b', 2]]));                 // => Map{ a: 1, b: 2 }
structuredClone(new Int8Array([1, 2, 3]));                      // => new Int8Array([1, 2, 3])
structuredClone(new AggregateError([1, 2, 3], 'message'));      // => new AggregateError([1, 2, 3], 'message'))
structuredClone(new TypeError('message', { cause: 42 }));       // => new TypeError('message', { cause: 42 })
structuredClone(new DOMException('message', 'DataCloneError')); // => new DOMException('message', 'DataCloneError')
structuredClone(document.getElementById('myfileinput'));        // => new FileList
structuredClone(new DOMPoint(1, 2, 3, 4));                      // => new DOMPoint(1, 2, 3, 4)
structuredClone(new Blob(['test']));                            // => new Blob(['test'])
structuredClone(new ImageData(8, 8));                           // => new ImageData(8, 8)
// etc.

structuredClone(new WeakMap()); // => DataCloneError on non-serializable types

[!WARNING]

  • Many platform types cannot be transferred in most engines since we have no way to polyfill this behavior, however .transfer option works for some platform types. I recommend avoiding this option.
  • Some specific platform types can't be cloned in old engines. Mainly it's very specific types or very old engines, but here are some exceptions. For example, we have no sync way to clone ImageBitmap in Safari 14.0- or Firefox 83-, so it's recommended to look to the polyfill source if you wanna clone something specific.

Base64 utility methods

Specification, MDN. Modules web.atob, web.btoa.

function atob(data: string): string;
function btoa(data: string): string;

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/stable|actual|full/atob
@devtea2025/quas-nobis-earum-officiis(-pure)/stable|actual|full/btoa

Examples:

btoa('hi, @devtea2025/quas-nobis-earum-officiis');      // => 'aGksIGNvcmUtanM='
atob('aGksIGNvcmUtanM='); // => 'hi, @devtea2025/quas-nobis-earum-officiis'

setTimeout and setInterval

Module web.timers. Additional arguments fix for IE9-.

function setTimeout(callback: any, time: any, ...args: Array<mixed>): number;
function setInterval(callback: any, time: any, ...args: Array<mixed>): number;

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/stable|actual|full/set-timeout
@devtea2025/quas-nobis-earum-officiis(-pure)/stable|actual|full/set-interval
// Before:
setTimeout(log.bind(null, 42), 1000);
// After:
setTimeout(log, 1000, 42);

setImmediate

Module web.immediate. setImmediate polyfill.

function setImmediate(callback: any, ...args: Array<mixed>): number;
function clearImmediate(id: number): void;

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/stable|actual|full/set-immediate
@devtea2025/quas-nobis-earum-officiis(-pure)/stable|actual|full/clear-immediate

Examples:

setImmediate((arg1, arg2) => {
  console.log(arg1, arg2); // => Message will be displayed with minimum delay
}, 'Message will be displayed', 'with minimum delay');

clearImmediate(setImmediate(() => {
  console.log('Message will not be displayed');
}));

queueMicrotask

Spec, module web.queue-microtask

function queueMicrotask(fn: Function): void;

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/stable|actual|full/queue-microtask

Examples:

queueMicrotask(() => console.log('called as microtask'));

URL and URLSearchParams

URL standard implementation. Modules web.url, web.url.can-parse, web.url.parse, web.url.to-json, web.url-search-params, web.url-search-params.delete, web.url-search-params.has, web.url-search-params.size.

class URL {
  constructor(url: string, base?: string);
  attribute href: string;
  readonly attribute origin: string;
  attribute protocol: string;
  attribute username: string;
  attribute password: string;
  attribute host: string;
  attribute hostname: string;
  attribute port: string;
  attribute pathname: string;
  attribute search: string;
  readonly attribute searchParams: URLSearchParams;
  attribute hash: string;
  toJSON(): string;
  toString(): string;
  static canParse(url: string, base?: string): boolean;
  static parse(url: string, base?: string): URL | null;
}

class URLSearchParams {
  constructor(params?: string | Iterable<[key, value]> | Object);
  append(name: string, value: string): void;
  delete(name: string, value?: string): void;
  get(name: string): string | void;
  getAll(name: string): Array<string>;
  has(name: string, value?: string): boolean;
  set(name: string, value: string): void;
  sort(): void;
  toString(): string;
  forEach(callbackfn: (value: any, index: number, target: any) => void, thisArg: any): void;
  entries(): Iterator<[key, value]>;
  keys(): Iterator<key>;
  values(): Iterator<value>;
  @@iterator(): Iterator<[key, value]>;
  readonly attribute size: number;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis/proposals/url
@devtea2025/quas-nobis-earum-officiis(-pure)/stable|actual|full/url
@devtea2025/quas-nobis-earum-officiis(-pure)/stable|actual|full/url/can-parse
@devtea2025/quas-nobis-earum-officiis/stable|actual|full/url/to-json
@devtea2025/quas-nobis-earum-officiis(-pure)/stable|actual|full/url-search-params

Examples:

URL.canParse('https://login:password@example.com:8080/?a=1&b=2&a=3&c=4#fragment'); // => true
URL.canParse('https'); // => false

URL.parse('https://login:password@example.com:8080/?a=1&b=2&a=3&c=4#fragment'); // => url
URL.parse('https'); // => null

const url = new URL('https://login:password@example.com:8080/foo/bar?a=1&b=2&a=3#fragment');

console.log(url.href);       // => 'https://login:password@example.com:8080/foo/bar?a=1&b=2&a=3#fragment'
console.log(url.origin);     // => 'https://example.com:8080'
console.log(url.protocol);   // => 'https:'
console.log(url.username);   // => 'login'
console.log(url.password);   // => 'password'
console.log(url.host);       // => 'example.com:8080'
console.log(url.hostname);   // => 'example.com'
console.log(url.port);       // => '8080'
console.log(url.pathname);   // => '/foo/bar'
console.log(url.search);     // => '?a=1&b=2&a=3'
console.log(url.hash);       // => '#fragment'
console.log(url.toJSON());   // => 'https://login:password@example.com:8080/foo/bar?a=1&b=2&a=3#fragment'
console.log(url.toString()); // => 'https://login:password@example.com:8080/foo/bar?a=1&b=2&a=3#fragment'

for (let [key, value] of url.searchParams) {
  console.log(key);   // => 'a', 'b', 'a'
  console.log(value); // => '1', '2', '3'
}

url.pathname = '';
url.searchParams.append('c', 4);

console.log(url.search); // => '?a=1&b=2&a=3&c=4'
console.log(url.href);   // => 'https://login:password@example.com:8080/?a=1&b=2&a=3&c=4#fragment'

const params = new URLSearchParams('?a=1&b=2&a=3');

params.append('c', 4);
params.append('a', 2);
params.delete('a', 1);
params.sort();

console.log(params.size); // => 4

for (let [key, value] of params) {
  console.log(key);   // => 'a', 'a', 'b', 'c'
  console.log(value); // => '3', '2', '2', '4'
}

console.log(params.has('a')); // => true
console.log(params.has('a', 3)); // => true
console.log(params.has('a', 4)); // => false

console.log(params.toString()); // => 'a=3&a=2&b=2&c=4'

[!WARNING]

  • IE8 does not support setters, so they do not work on URL instances. However, URL constructor can be used for basic URL parsing.
  • Legacy encodings in a search query are not supported. Also, @devtea2025/quas-nobis-earum-officiis implementation has some other encoding-related issues.
  • URL implementations from all of the popular browsers have significantly more problems than @devtea2025/quas-nobis-earum-officiis, however, replacing all of them does not look like a good idea. You can customize the aggressiveness of polyfill by your requirements.
DOMException:

The specification. Modules web.dom-exception.constructor, web.dom-exception.stack, web.dom-exception.to-string-tag.

class DOMException {
  constructor(message: string, name?: string);
  readonly attribute name: string;
  readonly attribute message: string;
  readonly attribute code: string;
  attribute stack: string; // in engines that should have it
  @@toStringTag: 'DOMException';
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/stable|actual|full/dom-exception
@devtea2025/quas-nobis-earum-officiis(-pure)/stable|actual|full/dom-exception/constructor
@devtea2025/quas-nobis-earum-officiis/stable|actual|full/dom-exception/to-string-tag

Examples:

const exception = new DOMException('error', 'DataCloneError');
console.log(exception.name);                            // => 'DataCloneError'
console.log(exception.message);                         // => 'error'
console.log(exception.code);                            // => 25
console.log(typeof exception.stack);                    // => 'string'
console.log(exception instanceof DOMException);         // => true
console.log(exception instanceof Error);                // => true
console.log(exception.toString());                      // => 'DataCloneError: error'
console.log(Object.prototype.toString.call(exception)); // => '[object DOMException]'

Iterable DOM collections

Some DOM collections should have iterable interface or should be inherited from Array. That means they should have forEach, keys, values, entries and @@iterator methods for iteration. So add them. Modules web.dom-collections.iterator and web.dom-collections.for-each.

class [
  CSSRuleList,
  CSSStyleDeclaration,
  CSSValueList,
  ClientRectList,
  DOMRectList,
  DOMStringList,
  DataTransferItemList,
  FileList,
  HTMLAllCollection,
  HTMLCollection,
  HTMLFormElement,
  HTMLSelectElement,
  MediaList,
  MimeTypeArray,
  NamedNodeMap,
  PaintRequestList,
  Plugin,
  PluginArray,
  SVGLengthList,
  SVGNumberList,
  SVGPathSegList,
  SVGPointList,
  SVGStringList,
  SVGTransformList,
  SourceBufferList,
  StyleSheetList,
  TextTrackCueList,
  TextTrackList,
  TouchList,
] {
  @@iterator(): Iterator<value>;
}

class [DOMTokenList, NodeList] {
  forEach(callbackfn: (value: any, index: number, target: any) => void, thisArg: any): void;
  entries(): Iterator<[key, value]>;
  keys(): Iterator<key>;
  values(): Iterator<value>;
  @@iterator(): Iterator<value>;
}

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis(-pure)/stable|actual|full/dom-collections/iterator
@devtea2025/quas-nobis-earum-officiis/stable|actual|full/dom-collections/for-each

Examples:

for (let { id } of document.querySelectorAll('*')) {
  if (id) console.log(id);
}

for (let [index, { id }] of document.querySelectorAll('*').entries()) {
  if (id) console.log(index, id);
}

document.querySelectorAll('*').forEach(it => console.log(it.id));

Iteration helpers

Helpers for checking iterability / get iterator in the pure version or, for example, for arguments object:

function isIterable(value: any): boolean;
function getIterator(value: any): Object;
function getIteratorMethod(value: any): Function | void;

CommonJS entry points:

@devtea2025/quas-nobis-earum-officiis-pure/es|stable|actual|full/is-iterable
@devtea2025/quas-nobis-earum-officiis-pure/es|stable|actual|full/get-iterator
@devtea2025/quas-nobis-earum-officiis-pure/es|stable|actual|full/get-iterator-method

Examples:

import isIterable from '@devtea2025/quas-nobis-earum-officiis-pure/actual/is-iterable';
import getIterator from '@devtea2025/quas-nobis-earum-officiis-pure/actual/get-iterator';
import getIteratorMethod from '@devtea2025/quas-nobis-earum-officiis-pure/actual/get-iterator-method';

let list = (function () {
  return arguments;
})(1, 2, 3);

console.log(isIterable(list)); // true;

let iterator = getIterator(list);
console.log(iterator.next().value); // 1
console.log(iterator.next().value); // 2
console.log(iterator.next().value); // 3
console.log(iterator.next().value); // undefined

getIterator({}); // TypeError: [object Object] is not iterable!

let method = getIteratorMethod(list);
console.log(typeof method);         // 'function'
let iterator = method.call(list);
console.log(iterator.next().value); // 1
console.log(iterator.next().value); // 2
console.log(iterator.next().value); // 3
console.log(iterator.next().value); // undefined

console.log(getIteratorMethod({})); // undefined

Missing polyfills

  • ES BigInt can't be polyfilled since it requires changes in the behavior of operators, you can find more info here. You could try to use JSBI.
  • ES Proxy can't be polyfilled, you can try to use proxy-polyfill which provides a very small subset of features.
  • ES String#normalize is not a very useful feature, but this polyfill will be very large. If you need it, you can use unorm.
  • ECMA-402 Intl is missed because of the size. You can use those polyfills.
  • window.fetch is not a cross-platform feature, in some environments, it makes no sense. For this reason, I don't think it should be in @devtea2025/quas-nobis-earum-officiis. Looking at a large number of requests it might be added in the future. Now you can use, for example, this polyfill.

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