ljharb/es-abstract

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

ES spec-compliant shim for ArrayBuffer.prototype.slice

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

Robustly `.call.bind()` a function

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

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

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

ECMAScript spec-compliant polyfill/shim for `globalThis`

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

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

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.

string representations of objects in node and the browser

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

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

My shareable eslint config

A robust & optimized `Array.from` polyfill, based on the ECMAScript 6 specification.

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

ES Object-related atoms: Object, ToObject, RequireObjectCoercible

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

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

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

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

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.

ES6 spec-compliant RegExp.prototype.flags shim.

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

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

ES5 spec-compliant shim for String.prototype.trim

Which kind of Typed Array is this JavaScript value? Works cross-realm, without `instanceof`, and despite Symbol.toStringTag.

Robustly get the byte length of a Typed Array

Robustly get the byte offset of a Typed Array

Unbox a boxed JS primitive value.

Get the ArrayBuffer out of a TypedArray, robustly.

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.

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

Get the byteOffset out of a DataView, robustly.

ES2019 spec-compliant String.prototype.trimEnd shim.

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

ES2019 spec-compliant String.prototype.trimStart shim.

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

Get the byteLength out of a DataView, robustly.

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

Robustly get the length of a Typed Array

Is this value negative zero? === will lie to you

Get the ArrayBuffer out of a DataView, robustly.

Is this value a JS SharedArrayBuffer?

JavaScript-compatible Unicode data. Arrays of code points, arrays of symbols, and regular expressions for Unicode v15.0.0’s categories, scripts, blocks, bidi, and other properties.