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

string representations of objects in node and the browser

Object.prototype.hasOwnProperty.call shortcut

Implementation of Function.prototype.bind

Robustly `.call.bind()` a function

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

ECMAScript spec abstract operations.

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

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

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

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

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.

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

A better forEach

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

ES2017 spec-compliant Object.entries shim.

ES5 spec-compliant shim for String.prototype.trim

ECMAScript extensions and shims

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

Configuration and scripts for Create React App.

Give your JavaScript the ability to speak many languages.

Analytics utility functions used by 'analytics' module