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has-symbols
Determine if the JS environment has Symbol support. Supports spec, or shams.
Symbol symbols typeof sham polyfill native core-js ES6
rxjs
Reactive Extensions for modern JavaScript
Rx RxJS ReactiveX ReactiveExtensions Streams Observables Observable Stream ES6 ES2015
es-abstract
ECMAScript spec abstract operations.
ECMAScript ES abstract operation abstract operation JavaScript ES5 ES6 ES7
is-callable
Is this JS value callable? Works with Functions and GeneratorFunctions, despite ES6 @@toStringTag.
Function function callable generator generator function arrow arrow function ES6 toStringTag @@toStringTag
is-typed-array
Is this value a JS Typed Array? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.
array TypedArray typed array is typed Int8Array Uint8Array Uint8ClampedArray Int16Array Uint16Array Int32Array Uint32Array Float32Array Float64Array
which-typed-array
Which kind of Typed Array is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.
array TypedArray typed array which typed Int8Array Uint8Array Uint8ClampedArray Int16Array Uint16Array Int32Array Uint32Array Float32Array Float64Array
core-js
Standard library
ES3 ES5 ES6 ES7 ES2015 ES2016 ES2017 ES2018 ES2019 ES2020 ES2021 ES2022 ES2023 ES2024
object.assign
ES6 spec-compliant Object.assign shim. From https://github.com/es-shims/es6-shim
Object.assign assign ES6 extend $.extend jQuery _.extend Underscore es-shim API polyfill shim
is-boolean-object
Is this value a JS Boolean? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Boolean ES6 toStringTag @@toStringTag Boolean object true false is-boolean
is-date-object
Is this value a JS Date object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Date ES6 toStringTag @@toStringTag Date object
regexp.prototype.flags
ES6 spec-compliant RegExp.prototype.flags shim.
RegExp.prototype.flags regex regular expression ES6 shim flag flags regexp RegExp#flags polyfill es-shim API
function.prototype.name
An ES2015 spec-compliant `Function.prototype.name` shim
Function.prototype.name function name ES6 ES2015 shim polyfill es-shim API
is-string
Is this value a JS String object or primitive? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
String string ES6 toStringTag @@toStringTag String object
is-number-object
Is this value a JS Number object? This module works cross-realm/iframe, and despite ES6 @@toStringTag.
Number ES6 toStringTag @@toStringTag Number object
object-is
ES2015-compliant shim for Object.is - differentiates between -0 and +0
is Object.is equality sameValueZero ES6 ES2015 shim polyfill es-shim API
core-js-pure
Standard library
ES3 ES5 ES6 ES7 ES2015 ES2016 ES2017 ES2018 ES2019 ES2020 ES2021 ES2022 ES2023 ES2024
is-nan
ES2015-compliant shim for Number.isNaN - the global isNaN returns false positives.
is NaN not a number number isNaN ES6 ES2015 shim polyfill es-shim API
promise-polyfill
Lightweight promise polyfill. A+ compliant
promise promise-polyfill ES6 promises-aplus
has-symbol-support-x
Tests if ES6 Symbol is supported.
ES6 hasSymbolSupport module javascript nodejs browser
es6-object-assign
ECMAScript 2015 (ES6) Object.assign polyfill and ponyfill
Object assign ES6 ECMAScript 6 ES2015 ECMAScript 2015 polyfill ponyfill