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

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

Define a data property on an object. Will fall back to assignment in an engine without descriptors.

Ensure that reserved words are quoted in object property keys

Match a Unicode property or property alias to its canonical property name per the algorithm used for RegExp Unicode property escapes in ECMAScript.

This plugin transforms checks for a private property in an object

Allow parsing of '#foo in obj' brand checks

Compile Unicode property escapes in Unicode regular expressions to ES5.

Match a Unicode property or property alias to its canonical property name per the algorithm used for RegExp Unicode property escapes in ECMAScript.

Unicode property alias mappings in JavaScript format for property names that are supported in ECMAScript RegExp property escapes.

Info on the properties and attributes of the web platform

The set of canonical Unicode property names supported in ECMAScript RegExp property escapes.

Define a non-enumerable property on an object. Uses Reflect.defineProperty when available, otherwise Object.defineProperty.

Transcend MCP Server — Assessments tools.

A fast, efficient Node.js Worker Thread Pool implementation

PostCSS plugin postcss-page-break to fallback `break-` properties with `page-break-` alias

Parse JSON with more helpful errors

hast utility to check if a node has a property

Define a lazily evaluated property on an object

Returns an array of all enumerable symbol properties found directly upon a given object