All Strict mode

A JavaScript Runtime implement in JavaScript.

Inspired by QuickJS.

• Provide a easy way to learning JavaScript engine. No needs to learn C.
• Only support strict mode and modern JavaScript feature.
  • Such as let, const, async, await, arrow function, class, etc.
  • Not implement with, eval, var, label etc.
• Please do not using this project for your production without any tested.
• Flexable, you can only use the part of JavaScript.
• Some prototype function of Builtin Object depends on the host environmnet.
  • For example, if you want to use Array.prototype.at in vm, you need make sure it can been used in host vm. Or you need to load ployfill.

# instal as global
npm install @xgheaven/jsscript -g

It's like Node.js cli without special module.

jsscript run your-file.js

# install
npm install @xgheaven/jsscript

import { Runtime, Features, parseScript, parseBytecode, toHostValue } from 'jsscript'
const runtime = new Runtime({
 features: [
 // inject builtin features
 new Features.ECMA262Feature(), // inject All ECMA262 Spec object, like `Promise`/`RegExp`/...
 // you can write your self feature
 ],
})
const context = runtime.newContext()
const script = `<your-script>`;
// parse it to function object
const fn = parseScript(context, script)
// or compile it bytecode then parse it
const bc = compileToBytecode(script)
const fn = parseBytecode(context, bc)
// run it
const ret = context.run(fn)
// convert js value of vm to host vm
console.log(toHostValue(ret))

TODO

TODO

The performance is not the core of jsscript. But It's still important for using. Using v8-7 version benchmark test. (It's so old, only support es5. I will find more newer test cases in the future to replace it)

I want to use jsscript as package name. But it too similar to the package js-script which published 10+ years ago. I have to add the personal scope in the package name.

• engine262