ECMA-262 is the official specification repository for the ECMAScript language standard.
The repository maintains the authoritative source document for ECMAScript, the standardized specification that defines the JavaScript language. The specification is written in a source format that is processed to generate a human-readable version accessible online. Developers and standards committee members can explore the specification's evolution through its version history using searchable tools. The repository serves as the central coordination point for the TC39 standards committee's work on the language.
This repository is essential for anyone involved in JavaScript language development, including engine implementers, tool authors, and those proposing new language features. It functions as both the living specification document and the process hub for standardization. The TC39 process for language proposals is documented here, with proposals tracked across multiple stages from initial ideas through finished features. Contributors interested in proposing new language features should consult the contribution guidelines provided in the repository.
Development of the specification follows a structured workflow. Contributors clone the repository and use npm commands to build the specification locally or set up continuous builds during development. The build system generates output in a designated directory, with cleanup tools available for resetting the build environment. The project maintains active community engagement through dedicated discussion forums and chat channels for ECMAScript-related questions and collaboration.
