es-shims/iterator-helpers

Robustly `.call.bind()` a function

Robust call-bound JavaScript intrinsics, using `call-bind` and `get-intrinsic`.

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.

Implementation of Function.prototype.bind

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

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

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

`Array.prototype.concat`, but made safe by ignoring Symbol.isConcatSpreadable

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

My shareable eslint config

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

Convert encodings, uses iconv-lite

Fixtures of ES values, for testing purposes

Import with sanity.

Evaluates javascript code blocks from markdown files.

A better forEach

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

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

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

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

Returns an arbitrary generator function, or undefined if generator syntax is unsupported.

Given an object and a property, replaces a property descriptor (or deletes it), and returns a thunk to restore it.

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

A helper to optimistically set Symbol.toStringTag, when possible.

ECMAScript spec-compliant polyfill/shim for `globalThis`

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

Does this environment have the ability to get the [[Prototype]] of an object on creation with `__proto__`?

ES spec-like internal slots

`Iterator.prototype`, or a shared object to use.

Iterate any JS iterator. Works robustly in all environments, all versions.