[SOLVED] Does Promise.resolve(1); involve microtask queue?

Does Promise.resolve(1); involve microtask queue?

I am searching whether Promise.resolve(1); includes any mcirotask queue or not? There is no .then() or .catch() handler attached to it. Only Promise.resolve(1); Example:

const v = Promise.resolve(1);

According to ECMA 2024 specs, I have read following algos:

27.2.4.7 Promise.resolve ( x )

This function returns either a new promise resolved with the passed argument, or the argument itself if the argument is a promise produced by this constructor.
1. Let C be the this value.
2. If C is not an Object, throw a TypeError exception.
3. Return ? PromiseResolve(C, x).
Note This function expects its this value to be a constructor function that supports the parameter conventions of the Promise constructor.

27.2.4.7.1 PromiseResolve ( C, x )

The abstract operation PromiseResolve takes arguments C (a constructor) and x (an ECMAScript language value) and returns either a normal completion containing an ECMAScript language value or a throw completion. It returns a new promise resolved with x. It performs the following steps when called:
1. If IsPromise(x) is true, then
a. Let xConstructor be ? Get(x, "constructor").
b. If SameValue(xConstructor, C) is true, return x.
2. Let promiseCapability be ? NewPromiseCapability(C).
3. Perform ? Call(promiseCapability.[[Resolve]], undefined, « x »).
4. Return promiseCapability.[[Promise]].
27.2.1.3.2 Promise Resolve Functions

A promise resolve function is an anonymous built-in function that has [[Promise]] and [[AlreadyResolved]] internal slots.

When a promise resolve function is called with argument resolution, the following steps are taken:
1. Let F be the active function object.
2. Assert: F has a [[Promise]] internal slot whose value is an Object.
3. Let promise be F.[[Promise]].
4. Let alreadyResolved be F.[[AlreadyResolved]].
5. If alreadyResolved.[[Value]] is true, return undefined.
6. Set alreadyResolved.[[Value]] to true.
7. If SameValue(resolution, promise) is true, then
a. Let selfResolutionError be a newly created TypeError object.
b. Perform RejectPromise(promise, selfResolutionError).
c. Return undefined.
8. If resolution is not an Object, then
a. Perform FulfillPromise(promise, resolution).
b. Return undefined.
9. Let then be Completion(Get(resolution, "then")).
10. If then is an abrupt completion, then
a. Perform RejectPromise(promise, then.[[Value]]).
b. Return undefined.
11. Let thenAction be then.[[Value]].
12. If IsCallable(thenAction) is false, then
a. Perform FulfillPromise(promise, resolution).
b. Return undefined.
13. Let thenJobCallback be HostMakeJobCallback(thenAction).
14. Let job be NewPromiseResolveThenableJob(promise, resolution, thenJobCallback).
15. Perform HostEnqueuePromiseJob(job.[[Job]], job.[[Realm]]).
16. Return undefined.
The "length" property of a promise resolve function is 1𝔽.
see step 8.a

27.2.1.4 FulfillPromise ( promise, value )

The abstract operation FulfillPromise takes arguments promise (a Promise) and value (an ECMAScript language value) and returns unused. It performs the following steps when called:
1. Assert: The value of promise.[[PromiseState]] is pending.
2. Let reactions be promise.[[PromiseFulfillReactions]].
3. Set promise.[[PromiseResult]] to value.
4. Set promise.[[PromiseFulfillReactions]] to undefined.
5. Set promise.[[PromiseRejectReactions]] to undefined.
6. Set promise.[[PromiseState]] to fulfilled.
7. Perform TriggerPromiseReactions(reactions, value).
8. Return unused.

Am I right in saying that Promise.resolve(1) does not include any microtask?

Solution

No, Promise.resolve(1) does not involve any microtasks. As you concluded correctly, it just returns a fulfilled promise: the promise is constructed and then resolved (in particular: immediately fulfilled) without any reactions to schedule, before Promise.resolve returns.