@rust-it/es-module-lexer

A Rust version of es-module-lexer, and it supports parsing jsx / ts / tsx out of the box. Powered by oxc.

Install

npm install @rust-it/es-module-lexer

Usage

import { parse, parseAsync } from '@rust-it/es-module-lexer';

const source = 'export { foo } from "./foo.ts";';

// sync
const { imports, exports } = parse(source, 'index.ts');
// async
const { imports, exports } = await parseAsync(source, 'index.ts');

parse multiple files:

import { parseMultiple, parseMultipleAsync } from '@rust-it/es-module-lexer';

const inputs = [
  {
    sourceText: 'export { foo } from "./foo.ts";',
    filePath: 'index.ts',
  },
  {
    sourceText: 'import bar from "./bar.ts";',
    filePath: 'other.ts',
  },
];

// sync
const results = parseMultiple(inputs);
// async
const results = await parseMultipleAsync(inputs);

// > results:
// {
//   'index.ts': { imports, exports, ... },
//   'other.ts': { imports, exports, ... },
// }

Check out es-module-lexer for details of the parse results.

Benchmark

Parse sample files.

 ✓ __test__/index.bench.ts (9) 10778ms
     name                                     hz       mean
   · es-module-lexer                          36.7348  27.2221   fastest
   · @rust-it/es-module-lexer                  8.4034   119.00  
   · @rust-it/es-module-lexer async           24.6149  40.6257  
   · @rust-it/es-module-lexer multiple        26.4290  37.8372  
   · @rust-it/es-module-lexer multiple async  26.5319  37.6905  
   · rs-module-lexer                           5.7273   174.60   slowest
   · rs-module-lexer async                    15.8369  63.1438  
   · rs-module-lexer multiple                 18.3675  54.4440  
   · rs-module-lexer multiple async           17.8458  56.0355  


 BENCH  Summary

  es-module-lexer - __test__/index.bench.ts > 
    1.38x faster than @rust-it/es-module-lexer multiple async
    1.39x faster than @rust-it/es-module-lexer multiple
    1.49x faster than @rust-it/es-module-lexer async
    2.00x faster than rs-module-lexer multiple
    2.06x faster than rs-module-lexer multiple async
    2.32x faster than rs-module-lexer async
    4.37x faster than @rust-it/es-module-lexer
    6.41x faster than rs-module-lexer