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485 packages found
Get an iterator for any JS language value. Works robustly across all environments, all versions.
An ES-spec-compliant shim/polyfill/replacement for the `.cause` property on all Error types that works as far down as ES3
- javascript
- polyfill
- ecmascript
- error
- shim
- syntaxerror
- typeerror
- referenceerror
- aggregateerror
- rangeerror
- evalerror
- urierror
`[].map(f)` for older browsers
An ES5 mostly-spec-compliant `Object.getPrototypeOf` sham/polyfill/replacement that works in as many engines as possible
Given an object and a property, replaces a property descriptor (or deletes it), and returns a thunk to restore it.
An ES-spec-compliant (proposed) Array.prototype.at shim/polyfill/replacement that works as far down as ES3
- Array.prototype.at
- Array.prototype.item
- String.prototype.at
- String.prototype.item
- item
- at
- array
- shim
- polyfill
- es-shim
- API
An ES5 spec-compliant `Array.prototype.every` shim/polyfill/replacement that works as far down as ES3.
Koa web app framework
ES2015 spec-compliant shim for Reflect.ownKeys
Does the current environment have `import()` support?
ES spec-compliant `Date` shim/polyfill/replacement that works as far down as ES3
a through stream that starts paused and resumes on the next tick
An ES5 spec-compliant `Array.prototype.some` shim/polyfill/replacement that works as far down as ES3.
recursively transform key strings to camel-case
An ESnext spec-compliant `DisposableStack`, `AsyncDisposableStack`, `Symbol.dispose`, and `Symbol.asyncDispose` shim/polyfill/replacement that works as far down as ES3.
- javascript
- ecmascript
- polyfill
- shim
- DisposableStack
- AsyncDisposableStack
- dispose
- asyncDispose
- using
- resource
- management
- Symbol
- Symbol.dispose
- Symbol.asyncDispose
return the first argument that is `!== undefined`
A robust & optimized `Array.from` polyfill, based on the ECMAScript 6 specification.
Polyfill/shim for util.promisify in node versions < v8
Are these two values conceptually equal?