esprima-next

Todo: Coverage does not work atm.

Esprima (esprima.org, BSD license) is a high performance, standard-compliant ECMAScript parser written in ECMAScript (also popularly known as JavaScript). Esprima is created and maintained by Ariya Hidayat, with the help of many contributors.

esprima-next

A fork of esprima (https://github.com/jquery/esprima), cause esprima has no new releases and many not merged pull req. if development/maintenance at jquery will start again, we maybe remove this fork.

Changes to original Esprima:

• Rename to esprima-next
• generate a ESM build
• update npm packages
• disable npm run static-analysis && npm run dynamic-analysis, seem not to work after package update
• we don't need to support node <= 12
• ES2022 Class Properties & Privates
• Support numeric seperator and BigInt
• import assertions

following Pull reqs are merged from @esprima github:

• Export Esrpima Nodes type #2045
• Fix super() in non derived class #2047
• Support for ES2020 import.meta #2052
• Support for ES2020 export ns from #2055
• Fix parsing error in exponent expressions with unary left-hand sides. #2070
• bugfix import() #2076
• Support ES2021 Logical Assignment #2082
• ESM release support #2081

Features

• Full support for ECMAScript 2022 (ECMA-262 13th Edition)
• Sensible syntax tree format as standardized by ESTree project
• Experimental support for JSX, a syntax extension for React
• Optional tracking of syntax node location (index-based and line-column)
• Heavily tested (~1600 unit tests with full code coverage)

API

Esprima can be used to perform lexical analysis (tokenization) or syntactic analysis (parsing) of a JavaScript program.

A simple example on Node.js REPL:

> import { esprima } from 'esprima-next';
> var program = 'const answer = 42';

> esprima.tokenize(program);
[ { type: 'Keyword', value: 'const' },
  { type: 'Identifier', value: 'answer' },
  { type: 'Punctuator', value: '=' },
  { type: 'Numeric', value: '42' } ]

> esprima.parseScript(program);
{ type: 'Program',
  body:
   [ { type: 'VariableDeclaration',
       declarations: [Object],
       kind: 'const' } ],
  sourceType: 'script' }

For more information, please read the complete documentation.