Node inspector worker_threads + child_process

process.mjs

/*
 * Run as `node process.mjs` and open Chrome DevTools or similar debugging tool
*/
import { fork } from "node:child_process";
import { fileURLToPath } from "node:url";
import inspector from "node:inspector";

const filename = fileURLToPath(import.meta.url);

if (!process.env.SOME_FLAG) {
  fork(filename, {
    env: { SOME_FLAG: "true" }, // Just to indicate when running this file inside child_process
    execArgv: [/* Just to indicate that no --inspect-brk is passed to process */],
  });
} else {
  inspector.open();
  inspector.waitForDebugger();

  // Stopping in child process
  debugger;
}

threads.mjs

/*
 * Run as `node threads.mjs` and open Chrome DevTools or similar debugging tool
*/
import { isMainThread, Worker } from "node:worker_threads";
import { fileURLToPath } from "node:url";
import inspector from "node:inspector";

const filename = fileURLToPath(import.meta.url);

if (isMainThread) {
  new Worker(filename, {
    execArgv: [/* Just to indicate that no --inspect-brk is passed to worker */] });
} else {
  inspector.open();
  inspector.waitForDebugger();

  // Stopping in worker thread!
  debugger;
}