[bd82]

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

Another example is espree used in ESLint 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

[z3t4]

How do they compare in extensibility ?

[bd82]

Acorn has a plugin system: https://github.com/ternjs/acorn#plugins

But as far as I know Esprima does not: https://github.com/jquery/esprima/issues/1168

I have no idea about Cherow...