A tiny JavaScript interpreter written in TypeScript
Note: This project was originally developed for use in YouTube.js.
npm install jintrExecute 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, visitor) => {
if (node.type === 'CallExpression' && node.callee.type === 'MemberExpression') {
const args = node.arguments.map((arg) => visitor.visitNode(arg));
return console.log(...args);
}
});
// 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('');
}
});
// Or you can just intercept access to specific nodes;
jinter.visitor.on('myFn', (node, visitor) => {
console.info('MyFn node just got accessed:', node);
return 'proceed'; // tells the interpreter to continue execution
});
jinter.interpret();For more examples see /test and /examples.
- Jinter(code: string)
Interprets the code passed to the constructor.
The node visitor. This is responsible for walking the AST and executing the nodes.
Represents the global scope of the program.
Distributed under the MIT License.