#ecmascript

Official ES spec-compliant polyfill for Object.fromEntries

ES6 spec-compliant RegExp.prototype.flags shim

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.

Which kind of boxed JS primitive is this?

Object.keys shim

Set a function's length property

Unbox a boxed JS primitive value.

ECMAScript 6 Symbol polyfill

esast utility to transform from estree

ES6-compliant shim for Number.isNaN - the global isNaN returns false positives.

What is the type of this builtin JS value?

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

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

A robust & optimized ES3-compatible polyfill for the `String.prototype.contains` method in ECMAScript 6.

Provides a list of reserved identifiers for JavaScript

esast (and estree) utility to visit nodes

micromark extension to support MDX or MDX JS expressions

Tiny and fast lodash alternative

Gets the description of a Symbol. Handles `Symbol()` vs `Symbol('')` properly when possible.

`Object.defineProperty`, but not IE 8's broken one.

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

utility to attach comments to estree nodes

unist utility to get a position from an estree node