jintr

Jinter

A tiny JavaScript interpreter written in TypeScript

Note: This project is experimental and not all JavaScript features are implemented! ¹

Usage

Execute some JavaScript code:

// const Jinter = require('jintr').default;
import Jinter from 'jintr';

const code = `
  function sayHiTo(person) {
    console.log('Hi ' + person + '!');
  }
  
  sayHiTo('mom');
`

const jinter = new Jinter(code);
jinter.interpret();

---

Inject your own functions and variables into the interpreter;

// ...

jinter.visitor.on('println', (node: any, visitor: Visitor) => {
  const args = node.arguments.map((arg: any) => visitor.visitNode(arg));
  return console.log(...args);
});

// Ex: str.toArray();
jinter.visitor.on('toArray', (node: any, visitor: Visitor) => {
  const obj = visitor.visitNode(node.callee.object);
  return obj.split('');      
});

// Or you can just intercept access to specific nodes;
jinter.visitor.on('myFn', (node: any, visitor: Visitor) => {
  console.info('MyFn node just got accessed:', node);
  return 'proceed'; // tells the interpreter to continue execution 
});

jinter.interpret();

More examples are available in the test & examples folders.

License

Distributed under the MIT License.

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Footnotes

1. This project was originally developed for use in YouTube.js. ↩