#ecmascript

ECMAScript "ToPrimitive" algorithm. Provides ES5 and ES6/ES2015 versions.

Check what’s defined in an estree scope

Broccoli plugin for Babel

Find and fix problems in your JavaScript code.

Out-of-box circular dependencies detector, support js, jsx, ts, tsx, mjs, cjs, vue.

ES6 spec-compliant Function.prototype.name sham.

ES5 spec-compliant shim for String.prototype.trim

Regular expressions processor in JavaScript

Robustly `.call.bind()` a function.

C's math functions in JavaScript

An ES-spec-compliant (proposed) `Array.prototype.at`shim/polyfill/replacement that works as far down as ES3.

Spec-compliant shim for `Object.getOwnPropertyDescriptors` that works in ES5.

ES2019 spec-compliant String.prototype.trimEnd shim

A robust, ES3 compatible, "has own property" predicate.

micromark extension to support MDX JS import/exports

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

Convert a string to a valid JavaScript identifier

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

Is this value a JS ArrayBuffer? This module works cross-realm/iframe, does not depend on `instanceof` or mutable properties, and despite ES6 Symbol.toStringTag.

Is this JS value callable? Works with Functions and GeneratorFunctions, despite ES6 @@toStringTag.

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.

micromark extension to support MDX or MDX.js JSX

An ESnext spec-compliant `Array.prototype.flat` shim/polyfill/replacement that works as far down as ES3.

An ESnext spec-compliant `Array.prototype.flatMap` shim/polyfill/replacement that works as far down as ES3.

The regular expression parser for ECMAScript.

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

ES spec-like internal slots.

Tiny JavaScript tokenizer.

regexpu’s core functionality, i.e. `rewritePattern(pattern, flag, options)`, which enables rewriting regular expressions that make use of the ES6 `u` flag into equivalent ES5-compatible regular expression patterns.

ES2017 spec-compliant shim for Object.entries