#ecmascript

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.

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

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.

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.

micromark extension to support MDX or MDX.js JSX

ES2017 spec-compliant shim for Object.entries

ES2017 spec-compliant shim for Object.values

ES6 spec-compliant RegExp.prototype.flags shim

Is this an ES BigInt value?

Which kind of boxed JS primitive is this?

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

ES spec-like internal slots.

Official ES spec-compliant polyfill for Object.fromEntries

ECMAScript AST query library.

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

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

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

What is the type of this builtin JS value?

ECMAScript Abstract Operations for "getting properties" (Get, GetV, GetMethod)

Object.keys shim

Regular expression for matching JavaScript identifiers

Transform JSX in estrees to function calls (for react, preact, and most hyperscript interfaces)