es-shims/set.prototype.symmetricdif...

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.

A simple cache for a few of the JS Error constructors.

An ES-spec-compliant Set shim/polyfill/replacement that works as far down as ES3

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

Firefox 17-26 iterators throw a StopIteration object to indicate "done". This normalizes it.

Loosely test a package's compliance with the es-shim API

My shareable eslint config

Use `npx aud` instead of `npm audit`, whether you have a lockfile or not!

Command line tool for generating a changelog from git tags and commit history

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

An ES-spec-compliant Map shim/polyfill/replacement that works as far down as ES3

Fixtures of ES values, for testing purposes

Evaluates javascript code blocks from markdown files.

A better forEach

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

`Object.getOwnPropertyDescriptor`, but accounts for IE's broken implementation.

Does the current JS environment have strict mode? ES5+ should; but let's not assume.

Detect if we were run as a result of `npm publish`

Command line tool for creating or updating a .npmignore file based on .gitignore.

the Istanbul command line interface

string representations of objects in node and the browser

Ensure that when you `npm publish`, the "latest" tag is only set for the truly latest version.

tap-producing test harness for node and browsers