specification (rulebook) that defines the basic rules of JavaScript. When a new version of ECMAScript is released, new syntax and features become available in JavaScript. However, not all browsers can ...

A React + TypeScript single-page app that renders ECMAScript 2025 grammar railroad diagrams (SVG) and shows each rule's EBNF text underneath. The grammar is implemented as "diagram factories" that ...

# a space, named `source.js source.es`. # In order to prevent two syntaxes from appearing in the menu, we use # `hidden: true` on the nested `source.es` syntax.

TypeScript 5.5, now in a release candidate, also features inferred type predicates, regular expression syntax checking, and performance and size optimizations. TypeScript 5.5, the latest version of ...