Lightweight, framework-agnostic in-app onboarding toolkit: product tours, tooltips, hotspots, checklists, modals and banners — pure JavaScript, no dependencies.

Array#isArray for older browsers

Get the command from a shebang

ECMAScript AST recursive visitor

Run a function exactly one time

deterministic `JSON.stringify()` - a faster version of substack's json-stable-strigify without jsonify

JSON parse & stringify that supports binary via bops & base64

Resolve the path of a module like `require.resolve()` but from a given path

Light ECMAScript (JavaScript) Value Notation - human written, concise, typed, flexible

Callback wrapping utility

Buffers events from a stream until you are ready to handle them.

Fast (and loose) selective `process.env` replacer using js-tokens instead of an AST

Returns true if a string has an extglob.

deterministic JSON.stringify() with custom sorting to get deterministic hashes from stringified results, with no public domain dependencies

Allows users to use generators in order to write common functions that can be both sync or async.

type-check allows you to check the types of JavaScript values at runtime with a Haskell like type syntax.

A small polyfill for Object.setprototypeof

The Node.js `util.deprecate()` function with browser support

Safer Node.js Buffer API

Fast deep equal