acorn
https://github.com/acornjs/acorn
JavaScript
A small, fast, JavaScript-based JavaScript parser
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- Issues
- "use strict" directive is not recognized when the next line starts with `++`, `--` or `in`
- readWord deoptimizes on every keyword token under JavaScriptCore
- Register function id for Annex B.3.1 labeled function declaration
- currentVarScope/currentThisScope walk the scope stack per statement, so deeply nested blocks parse in quadratic time
- "Runtime Errors for Function Call Assignment Targets" Test262 tests fail
- Remove `expression` property from `Function{Declaration,Expression}`
- Replace keyword Regexps with Sets for improved performance
- [acorn] Missing `value` property in `Token` (TypeScript)
- Latest release is missing type definitions
- Add support for spec-compliant decorators
- Docs
- JavaScript not yet supported