[actions]: https://github.com/LuanRT/Jinter/actions

Jinter

A tiny JavaScript interpreter written in TypeScript

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

Table of Contents

- Installation
- Usage
- API
- evaluate(input: string)
- visitor
- scope
- License

Installation

``sh
npm install jintr
`

Usage

Execute some JavaScript code:
`ts
// 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:
`ts
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.

API


* Jinter()
* evaluate(input: string)
* visitor
* scope`

$3

Evaluates the given JavaScript code.

$3

The node visitor. This is responsible for walking the AST and executing the nodes.

$3

Represents the global scope of the program.

License

Distributed under the MIT License.

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