src/v8/test/mjsunit/async-hooks/execution-order.js

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// Flags: --expose-async-hooks

// Check for correct execution of available hooks and asyncIds
(function() {
  let calledHooks = [];
  let rootAsyncId = 0;

  let ah = async_hooks.createHook({
    init: function init(asyncId, type, triggerAsyncId, resource) {
      if (type !== 'PROMISE') {
        return;
      }
      if (triggerAsyncId === 0) {
        rootAsyncId = asyncId;
      }
      calledHooks.push(['init', asyncId]);
    },
    promiseResolve: function promiseResolve(asyncId) {
      calledHooks.push(['resolve', asyncId]);
    },
    before: function before(asyncId) {
      calledHooks.push(['before', asyncId]);
    },
    after: function after(asyncId) {
      calledHooks.push(['after', asyncId]);
    },
  });
  ah.enable();

  new Promise(function(resolve) {
    resolve(42);
  }).then(function() {
    // [hook type, async Id]
    const expectedHooks = [
      ['init', rootAsyncId],  // the promise that we create initially
      ['resolve', rootAsyncId],
      ['init', rootAsyncId + 1],  // the chained promise with the assertions
      ['init', rootAsyncId + 2],  // the chained promise from the catch block
      ['before', rootAsyncId + 1],
      // ['after', rootAsyncId + 1] will get called after the assertions
    ];

    assertArrayEquals(expectedHooks, calledHooks,
      'Mismatch in async hooks execution order');
  }).catch((err) => {
    setTimeout(() => {
      throw err;
    }, 0);
  });
})();