Enumerating and analyzing 40 non-V8 JavaScript implementations

• ChakraCore

  15 9,031 5.3 JavaScript

  ChakraCore is an open source Javascript engine with a C API.

  

I am astonished at the omission of ChakraCore, open sourced by Microsoft but sadly abandoned by them after they switched Edge to Chromium: https://github.com/chakra-core/ChakraCore. But it looks like it’s still chugging along as a community effort rather than being completely abandoned.

• test262

  5 2,190 9.2 JavaScript

  Official ECMAScript Conformance Test Suite

  

I have used a few js engines in the past (nashorn, rhino, otto) and all had problems with missing edge cases in the APIs or really weird quirks in the interop with the host environment.

https://github.com/tc39/test262 is the ecma test suite.

rhino for example has extensive gaps:

• WorkOS

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  The modern identity platform for B2B SaaS. The APIs are flexible and easy-to-use, supporting authentication, user identity, and complex enterprise features like SSO and SCIM provisioning.

  

• rhino

  14 3,971 8.0 JavaScript

  Rhino is an open-source implementation of JavaScript written entirely in Java

  

https://github.com/mozilla/rhino/blob/master/testsrc/test262...

It is really frustrating that in the end, there aren't really that many actually compliant implementations. Especially implementing the exact regex behaviour.

• engine262

  9 774 6.3 TypeScript

  An implementation of ECMA-262 in JavaScript

  

Interesting to see a JS implementation written in JS:

https://github.com/engine262/engine262/

(The readme explains what the point of it is.)

• Jint

  24 3,910 9.1 C#

  Javascript Interpreter for .NET

• mjs

  2 123 0.0 C++

  ECMAScript Interpreter (by mras0)

I made a toy ECMAScript interpreter a couple of years ago: https://github.com/mras0/mjs

Not really notable, expect perhaps being the only one on the list with an ES1 mode? :) (Can't promise it's accurate though, as it was hard to find examples).

Otherwise pretty boring (C++, hand-written parser, AST interpreter, ES1/ES3/ES5.1 support minus some regexp/timezone/locale stuff).

• qtdeclarative

  4 194 9.9 C++

  Qt Declarative (Quick 2)

  

Ok sweet I see now. They used JavaScriptCore until 2011 or so, switched to V8 until 2013, and have been using their own implementation, q4, since then. The source code seems to be here: https://github.com/qt/qtdeclarative/tree/dev/src/qml/jsrunti....

Thanks! Will add and be live shortly.

• InfluxDB

  www.influxdata.com sponsored

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