The semantic version parser used by npm.

RFC4122 (v1, v4, and v5) UUIDs

Array#isArray for older browsers

A querystring parser that supports nesting and arrays, with a depth limit

babel's modular runtime helpers

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

Implementation of Function.prototype.bind

Robustly `.call.bind()` a function

string representations of objects in node and the browser

Fast deep equal

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

Returns true if the value is an object and not an array or null.

Store information about any JS value in a side channel. Uses WeakMap if available.

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

ECMAScript spec abstract operations.

Define multiple non-enumerable properties at once. Uses `Object.defineProperty` when available; falls back to standard assignment in older engines.

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

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

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

ES6 spec-compliant RegExp.prototype.flags shim.

Standard library

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

ES spec-like internal slots

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

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

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

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

Does this JS environment support the `name` property on functions?

ES2017 spec-compliant Object.values shim.

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

Object.prototype.hasOwnProperty.call shortcut

Cooperative scheduler for the browser environment.

ECMAScript spec-compliant polyfill/shim for `globalThis`

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

Runtime type checking for React props and similar objects.

Is this an arguments object? It's a harder question than you think.

React is a JavaScript library for building user interfaces.

ES proposal-spec-compliant Object.fromEntries shim.

ES2017 spec-compliant Object.entries shim.

Spec-compliant polyfill for String.prototype.matchAll

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

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

Event names used in storybook core

Get an iterator for any JS language value. Works robustly across all environments, all versions.

Merge longhand properties into shorthand with PostCSS.

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

Utility package to determine if an `Array.prototype` method properly boxes the callback's receiver and third argument.

ECMAScript extensions and shims

Lodash exported as ES modules.

Core Storybook Router

timers module for browserify

Like lodash isEqualWith but for shallow equal.

TypeScript package which smartly trims and strips indentation from multi-line strings

Throttle and debounce functions.

ES2017 spec-compliant String.prototype.padEnd shim.

is that thing a function? Use this module to find out

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

Iterate any JS iterator. Works robustly in all environments, all versions.

ES Proposal spec-compliant shim for Promise.allSettled

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

ES2017 spec-compliant String.prototype.padStart shim.

Resize event emitter for elements.

Batch processing in JS

Make your React Components aware of their width and/or height!