Where to Find Esprima Documentation, Source Code, and Community Resources

Esprima's official site, esprima.org, is the central hub for all of its resources. From there you can reach the complete documentation, the GitHub source repository, the issue tracker, the mailing list, and supporting materials such as unit tests, benchmarks, and videos. The sections below map each resource to what it gives you.

Documentation and API Reference

The site links to the complete documentation, which covers the API and usage. Esprima performs two core kinds of analysis on a JavaScript program:

• Lexical analysis (tokenization) — esprima.tokenize(program) returns a flat list of tokens with type and value.
• Syntactic analysis (parsing) — esprima.parse(program) returns a full syntax tree.

A simple example from the documentation, run in a Node.js REPL:

> var esprima = require('esprima');
> var program = 'const answer = 42';
> esprima.tokenize(program);
[ { type: 'Keyword', value: 'const' },
  { type: 'Identifier', value: 'answer' },
  { type: 'Punctuator', value: '=' },
  { type: 'Numeric', value: '42' } ]
> esprima.parse(program);
{ type: 'Program',
  body: [ { type: 'VariableDeclaration', declarations: [Object], kind: 'const' } ],
  sourceType: 'script' }

The documentation is the place to go for the full API surface, including options such as node location info in the syntax tree.

Source Code and Issue Tracking

• Git Repository — the project is hosted on GitHub, where you can read the source, follow changes, and clone it.
• Issue Tracker — for bug reports and feature requests.
• Mailing List — for discussion and questions.

Testing, Benchmarks, and Other Resources

The site also points to materials useful if you want to verify behavior or compare performance:

What Esprima Supports

Knowing the scope helps you decide whether it fits your task. According to the site, Esprima is a high-performance, standard-compliant ECMAScript parser written in ECMAScript (JavaScript), created and maintained by Ariya Hidayat. Its stated features include:

• Full support for ECMAScript 2019 (ECMA-262 10th Edition)
• A sensible syntax tree format, with optional node location info
• Experimental support for JSX, the syntax extension for React
• Heavy testing (~1600 tests with full code coverage)

What You Can Build With the Syntax Tree

Once you have the full syntax tree, the site notes that various static code analyses become possible, including syntax visualization, code validation, and editing autocomplete with type inferencing. Regenerating code from the syntax tree enables code transformation, ranging from simple rewriting with specific formatting to more complicated minification.

If you need the parser itself, start at esprima.org and follow the documentation link; if you want to inspect or contribute to the implementation, go to the GitHub repository; and if you have a question or a bug, use the mailing list or issue tracker.