beating Acorn & Esprima in raw performance is very very impressive. But please consider that performance is not the only factor when building parsers. Extensi

beating Acorn & Esprima in raw performance is very very impressive. But please consider that performance is not the only factor when building parsers. Extensibility is a major concern. Afaik Babylon (used in babel) is a fork of Acorn partly driven by the need for greater extensibility. https://github.com/babel/babylon https://github.com/babel/babylon Another example is espree used in ESLint https://github.com/eslint/espree https://github.com/eslint/espree According to their readme.md espree was based on Esprima and is now using Acorn. Specifically for extensibility reasons. https://github.com/eslint/espree/issues/200 https://github.com/eslint/espree/issues/200