Custom jest matchers to test the state of the DOM

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

Read and peek from a readable stream

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

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

The one-liner node.js proxy middleware for connect, express, next.js and more

Types to work with Scalar packages

Import with sanity.

Command-line interface for mermaid

simple, flexible, fun test framework

request the caniuse data to check browsers compatibilities

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

A date range picker for your React app.

Implementation of Function.prototype.bind

Create binary artifacts hosted by github and install them without compiling.

a CSS selector compiler/engine

A modern tooling library for asynchronous operations using async/await, promises and async generators

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

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

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