ljharb/es-abstract

Get the byte length of an ArrayBuffer, even in engines without a `.byteLength` method.

Returns an array of Typed Array names that are available in the current environment

Robustly `.call.bind()` a function

`Object.defineProperty`, but not IE 8's broken one.

A simple cache for a few of the JS Error constructors.

Get and robustly cache all JS language-level intrinsics at first require time

ECMAScript spec-compliant polyfill/shim for `globalThis`

`Object.getOwnPropertyDescriptor`, but accounts for IE's broken implementation.

Does the environment have full property descriptor support? Handles IE 8's broken defineProperty/gOPD.

Is this value a JS regex? Works cross-realm/iframe, and despite ES6 @@toStringTag

string representations of objects in node and the browser

ES6 spec-compliant Object.assign shim. From https://github.com/es-shims/es6-shim

ES6 spec-compliant RegExp.prototype.flags shim.

Robustly get the byte length of a Typed Array

Robustly get the byte offset of a Typed Array

Robustly get the length of a Typed Array

ES spec-compliant shim for ArrayBuffer.prototype.slice

Get the ArrayBuffer out of a DataView, robustly.

Get the byteLength out of a DataView, robustly.

Robust call-bound JavaScript intrinsics, using `call-bind` and `get-intrinsic`.

Get the byteOffset out of a DataView, robustly.

ES Object-related atoms: Object, ToObject, RequireObjectCoercible

A helper to optimistically set Symbol.toStringTag, when possible.

ECMAScript “ToPrimitive” algorithm. Provides ES5 and ES2015 versions.

Robustly get the [[Prototype]] of an object

Gets the description of a Symbol. Handles `Symbol()` vs `Symbol('')` properly when possible.

An ES2015 spec-compliant `Function.prototype.name` shim

Does this environment have the ability to get the [[Prototype]] of an object on creation with `__proto__`?

Determine if the JS environment has Symbol support. Supports spec, or shams.

A robust, ES3 compatible, "has own property" predicate.

ES spec-like internal slots

Is this value a JS ArrayBuffer?

Is this JS value callable? Works with Functions and GeneratorFunctions, despite ES6 @@toStringTag.

Is this value a JS DataView? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.

Is this value a JS SharedArrayBuffer?

Is this value a JS String object or primitive? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

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.

Is this value a JS WeakRef? This module works cross-realm/iframe, and despite ES6 @@toStringTag.

ES Math-related intrinsics and helpers, robustly cached.

An Object.keys replacement, in case Object.keys is not available. From https://github.com/es-shims/es5-shim

Robustly get an object's own property keys (strings and symbols), including non-enumerables when possible

`Array.prototype.concat`, but made safe by ignoring Symbol.isConcatSpreadable

Push an array of items into an array, while being robust against prototype modification

Give a regex, get a robust predicate function that tests it against a string.

Robustly set the [[Prototype]] of an object

ES5 spec-compliant shim for String.prototype.trim

ES2019 spec-compliant String.prototype.trimEnd shim.

ES2019 spec-compliant String.prototype.trimStart shim.

Get the ArrayBuffer out of a TypedArray, robustly.

Unbox a boxed JS primitive value.

An ES7/ES2016 spec-compliant `Array.prototype.includes` shim/polyfill/replacement that works as far down as ES3.

ES proposal-spec-compliant Object.fromEntries shim.

An ES2019 spec-compliant `Array.prototype.flatMap` shim/polyfill/replacement that works as far down as ES3.

Spec-compliant polyfill for String.prototype.matchAll

Dynamics Contract

An ES2019 spec-compliant `Array.prototype.flat` shim/polyfill/replacement that works as far down as ES3.

This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).

ES5 spec-compliant shim for String.prototype.trim

Gassefals

ES spec-compliant shim for Object.hasOwn

Zona X MOD

An ESnext spec-compliant `Array.prototype.toSorted` shim/polyfill/replacement that works as far down as ES3.

ES spec-compliant shim for ArrayBuffer.prototype.slice

An ES2015 mostly-spec-compliant `Reflect.getPrototypeOf` sham/polyfill/replacement that works in as many engines as possible

An ESnext spec-compliant iterator helpers 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.

ES2017 spec-compliant shim for `Object.getOwnPropertyDescriptors` that works in ES5.

ES Proposal spec-compliant shim for Promise.allSettled

An ESnext spec-compliant `Array.prototype.findLastIndex` shim/polyfill/replacement that works as far down as ES3.

An ESnext spec-compliant `Array.prototype.findLast` shim/polyfill/replacement that works as far down as ES3.

An ESnext spec-compliant `Array.prototype.toReversed` shim/polyfill/replacement that works as far down as ES3.

An ES5 spec-compliant `Array.prototype.map` shim/polyfill/replacement that works as far down as ES3.

An ES5 spec-compliant `Array.prototype.reduce` shim/polyfill/replacement that works as far down as ES3.

ES Proposal spec-compliant shim for Promise.prototype.finally

ES2017 spec-compliant String.prototype.padStart shim.

ES2017 spec-compliant String.prototype.padEnd shim.

An ES5 spec-compliant `Array.prototype.filter` shim/polyfill/replacement that works as far down as ES3.

Array.prototype.find ES6 polyfill.

A robust & optimized `String.prototype.repeat` polyfill, based on the ECMAScript 6 specification.

This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).

A robust & optimized `String.prototype.startsWith` polyfill, based on the ECMAScript 6 specification.

This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).

This is a [Next.js](https://nextjs.org/) project bootstrapped with [`create-next-app`](https://github.com/vercel/next.js/tree/canary/packages/create-next-app).

ES 2021 spec-compliant shim for Promise.any

Array.prototype.findIndex ES2015 polyfill.

Spec-compliant polyfill for String.prototype.replaceAll ESnext proposal