Option to disable the typecheck-worker

[NullVoxPopuli]

Please paste the output of ember -v here

$ ember -v
ember-cli: 3.16.2
node: 12.16.3
os: linux x64

Please paste the output of tsc -v here

$ tsc -v
Version 4.0.2

Please paste the version of ember-cli-typescript and ember-cli-typescript-blueprints here

├─ [email protected]

What are instructions we can follow to reproduce the issue?

construct a node test that spawns ember-build multiple times

// node-tests/build/worker.js
const { expose } = require('threads/worker');
const { createBuilder } = require('broccoli-test-helper');

async function build() {
  let createApp = require('../../ember-cli-build'); // addon's ember-cli-build

  let app = createApp();
  let output = createBuilder(app);

  try {
    await output.build();

    return output.read();
  } finally {
    await output.dispose();
  }
}

expose({ build });

// node-tests/build/index-test.js

const assert = require('assert');
const { spawn: _spawn, Thread, Worker } = require('threads');

function spawn() {
  return _spawn(new Worker('./worker.js'));
}

describe('Acceptance | Build | index', function() {
  this.timeout(4 * 60e3);

  let thread;

  afterEach(async function() {
    if (thread) {
      await Thread.terminate(thread);
    }
  });

  it('Scenario A', async function() {
    thread = await spawn();

    let { assets: { 'vendor.js': vendorJs } } = await thread.build();

    assert.ok(true);
  });

  it('Scenario B', async function() {
    thread = await spawn();

    let { assets: { 'vendor.js': vendorJs } } = await thread.build();

    assert.ok(true);
  });
});

Using Mocha,

mocha node-tests/**/*-test.js

Obverve that the tests never exit.

(NOTE: OS may matter)

$ lsb_release -a
No LSB modules are available.
Distributor ID:	Ubuntu
Description:	Ubuntu 18.04.5 LTS
Release:	18.04
Codename:	bionic

$ uname -a 
Linux my-vm 5.4.0-47-generic #51~18.04.1-Ubuntu SMP Sat Sep 5 14:35:50 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

How to fix temporarily:

In the root package.json, I added a script to delete the type-checking worker code:

    "postinstall": "> node_modules/ember-cli-typescript/js/lib/typechecking/worker/launch.js"

[dfreeman]

@NullVoxPopuli I'm going to close this out since we discussed in Discord that using ember-cli-typescript without the typecheck worker doesn't make sense now that ember-cli-babel can perform typechecking directly.