bun.sh/test/js/node/test/parallel/test-timers-immediate-queue-throw.js

'use strict';

const common = require('../common');
const assert = require('assert');
const domain = require('domain');

// setImmediate should run clear its queued cbs once per event loop turn
// but immediates queued while processing the current queue should happen
// on the next turn of the event loop.

// In addition, if any setImmediate throws, the rest of the queue should
// be processed after all error handling is resolved, but that queue
// should not include any setImmediate calls scheduled after the
// processing of the queue started.

let threw = false;
let stage = -1;

const QUEUE = 10;

const errObj = {
  name: 'Error',
  message: 'setImmediate Err'
};

process.once('uncaughtException', common.mustCall((err, errorOrigin) => {
  assert.strictEqual(errorOrigin, 'uncaughtException');
  assert.strictEqual(stage, 0);
  common.expectsError(errObj)(err);
}));

// The domain part of this test is commented out because it's not planned to be
// supported in Bun. The rest of this test is untouched and still tests the behavior
// of throwing errors in setImmediate callbacks exactly like Node.js.

// const d1 = domain.create();
// d1.once('error', common.expectsError(errObj));
// d1.once('error', () => assert.strictEqual(stage, 0));

const run = common.mustCall((callStage) => {
  assert(callStage >= stage);
  stage = callStage;
  if (threw)
    return;

  setImmediate(run, 2);
}, QUEUE * 3);

for (let i = 0; i < QUEUE; i++)
  setImmediate(run, 0);
setImmediate(() => {
  threw = true;
  process.nextTick(common.mustCall(() => assert.strictEqual(stage, 1)));
  throw new Error('setImmediate Err');
});
// d1.run(() => setImmediate(() => {
//   throw new Error('setImmediate Err');
// }));
for (let i = 0; i < QUEUE; i++)
  setImmediate(run, 1);