browserify/node-util

Browser-friendly inheritance fully compatible with standard node.js inherits()

Run TAP unit tests in 1789+ browsers

Standard library

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

Run an array of functions in series

Safer Node.js Buffer API

tap-producing test harness for node and browsers

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

Determine if a function is a native generator function.

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.

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

ES2017 spec-compliant Object.entries shim.