@tangelo/tangelo-configuration-toolkit/src/lib/worker-with-spinner.js

Tangelo Configuration Toolkit is a command-line toolkit which offers support for developing a Tangelo configuration.

const {Worker}  = require('worker_threads');
const {Spinner} = require('cli-spinner');


module.exports = function workerWithSpinner (spinnerTxt, workerFn, postMsg, onMessageFn) {

  const spinner = new Spinner(`  ${spinnerTxt} %s`).setSpinnerDelay(150).start();

  const wFnWrap = (wFn) => {
    const {parentPort} = require('worker_threads');
    parentPort.once('message', postMsg => {
      parentPort.postMessage(wFn(postMsg));
    });
  };

  return new Promise((resolve) => {
    const worker = new Worker(`(${wFnWrap.toString()})(${workerFn.toString()})`, {eval: true});
    worker.on('message', msg => {
      spinner.stop(true);
      onMessageFn(msg);
      resolve();
    });
    worker.on('error', err => _error('\n' + err.stdout));
    worker.postMessage(postMsg);
  });

};