inspector

index.js

const util = require('util');
const inspector = require('inspector');
const session = new inspector.Session();

const post = util.promisify(session.post).bind(session);

function test() {
    console.log('hello');
    console.log('world');
    return 12345;
}

(async () => {
    session.connect();
    try {
        let scripts = {};

        session.on('Debugger.scriptParsed', ({params}) => {
            scripts[params.url] = params.scriptId;
        });

        session.on('Debugger.paused', ({params}) => {
            console.log(params);
        });

        await post('Debugger.enable');
        let scriptId = Object.keys(scripts).reduce(
            (id, url) => id || (url == `file://${__filename}` && scripts[url]),
            0
        );
        await post('Debugger.setBreakpoint', {location: {scriptId, lineNumber: 9}});

        console.log(test());
    } finally {
        session.disconnect();
    }
})().catch(err => console.error(err));