Jintr NPM | npm.io

Note: This project was originally developed for use in YouTube.js.

Installation

npm install jintr

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();
jinter.evaluate(code);

Inject your own functions, objects, etc:

import { Jinter } from 'jintr';

const jinter = new Jinter();

const code = `
  console.log(new SomeClass().a);
  console.log('hello'.toArray());

  function myFn() {
    console.log('[myFn]: Who called me?');
  }

  myFn();
`;

class SomeClass {
  constructor() {
    this.a = 'this is a test';
  }
}

jinter.defineObject('SomeClass', SomeClass);

// Ex: str.toArray();
jinter.visitor.on('toArray', (node, visitor) => {
  if (node.type === 'CallExpression' && node.callee.type === 'MemberExpression') {
    const obj = visitor.visitNode(node.callee.object);
    return obj.split('');
  }
});

// Intercept function calls
jinter.visitor.on('myFn', (node) => {
  if (node.type == 'CallExpression')
    console.info('myFn was called!');
  return '__continue_exec';
});

jinter.evaluate(code);

For more examples see /test and /examples.