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485 packages found
Is this value a JS Map? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Spec-compliant polyfill for String.prototype.matchAll
Is this value a JS WeakSet? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Which kind of Collection (Map, Set, WeakMap, WeakSet) is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.
Is this value a JS WeakMap? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
An ESnext spec-compliant `Array.prototype.findLastIndex` shim/polyfill/replacement that works as far down as ES3.
An ESnext spec-compliant `Object.groupBy` shim/polyfill/replacement that works as far down as ES3.
ES spec-compliant shim for Object.hasOwn
A simple list of possible Typed Array names.
- typed
- array
- typedarray
- Float32Array
- Float64Array
- Int8Array
- Int16Array
- Int32Array
- Uint8Array
- Uint8ClampedArray
- Uint16Array
- Uint32Array
- BigInt64Array
- BigUint64Array
An ESnext spec-compliant `Array.prototype.toSorted` shim/polyfill/replacement that works as far down as ES3.
Store information about any JS value in a side channel. Uses WeakMap if available.
An ESnext spec-compliant iterator helpers shim/polyfill/replacement that works as far down as ES3.
- javascript
- ecmascript
- polyfill
- shim
- es-shims
- es-shim API
- Iterator
- helpers
- from
- map
- filter
- take
- drop
- flatMap
- View more
An ES2015 mostly-spec-compliant `Reflect.getPrototypeOf` sham/polyfill/replacement that works in as many engines as possible
- Reflect.getPrototypeOf
- Object.getPrototypeOf
- proto
- __proto__
- [[Prototype]]
- getPrototypeOf
- ES5
- shim
- polyfill
- es-shim API
- browser
Helper package to shim a method into `Array.prototype[Symbol.unscopables]`
An ES2015 spec-compliant `Function.prototype.name` shim
AST utility module for statically analyzing JSX
`Iterator.prototype`, or a shared object to use.
Get the byteLength out of a DataView, robustly.
Get the byteOffset out of a DataView, robustly.