test: refactor to avoid mutation of global by a loader #46220

targos · 2023-01-15T12:07:37Z

This makes the test compatible with off-thread loaders.

nodejs-github-bot · 2023-01-15T12:30:27Z

CI: https://ci.nodejs.org/job/node-test-pull-request/48991/

targos · 2023-01-15T12:43:41Z

test/fixtures/es-module-loaders/hook-resolve-type.mjs

+      // Artificial timeout to keep the event loop alive.
+      // https://bugs.chromium.org/p/v8/issues/detail?id=13238
+      // TODO(targos) Remove when V8 issue is resolved.
+      const timeout = setTimeout(() => {}, 1_000);
+      await Atomics.waitAsync(int32, 0, 0).value;
+      clearTimeout(timeout);


/cc @joyeecheung this is related to https://bugs.chromium.org/p/v8/issues/detail?id=13238 / #44409

FWIW the current implementation of #44710 relies on Atomics.waitAsync not keeping the event loop alive.

@aduh95 What would be your expectation? Should Atomics.waitAsync keep the event loop alive?

Ideally there would be a way to control it, like you can opt-out for setTimeout. My expectation was that it would not keep the event loop alive, but I could see how that can also be annoying for some (most?) use cases. Does it also not keep the event loop alive if you add a fourth timeout parameter?

The fourth timeout parameter doesn't change the behavior.

I think so far the vibes I got is that "this is host-defined" i.e. Node.js gets to decide if the timeout parameter keeps the event loop alive (neither the ES or the Web specs have this "shut down the loop on completion" concept, they just assume the agent runs forever until it gets told to shut down, so we are on our own here), but also if we want to implement that, V8 needs to provide a way in the platform API for canceling a delayed task (so that when it wakes up before the timeout, we get notified that there is no need to keep the event loop alive for it anymore), which is probably too much complexity, so to be lazy we can also just keep the things the way they are (not let the time out keep the event loop alive, which some may argue is also their expected behavior, like how an unresolved promise doesn't keep the thread alive).

GeoffreyBooth

LGTM. FYI in nodejs/loaders#124 (reply in thread) I’m discussing redesigning globalPreload, possibly by creating a new API to handle the communications port stuff and getting rid of the “sloppy mode script” aspect of globalPreload now that we have --import. I was thinking that that could come after we land off-thread, though, and possibly even after making loaders stable (I would keep globalPreload as experimental but mark resolve and load as stable).

nodejs-github-bot · 2023-01-15T21:13:00Z

CI: https://ci.nodejs.org/job/node-test-pull-request/48993/

GeoffreyBooth · 2023-01-15T21:19:10Z

@targos I assume this new version of this test passes both on main and in the off-thread branch?

This makes the test compatible with off-thread loaders. Co-Authored-By: Geoffrey Booth <webadmin@geoffreybooth.com>

targos · 2023-01-16T09:58:46Z

@GeoffreyBooth Yes, it passes on both branches.

nodejs-github-bot · 2023-01-17T12:13:12Z

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- Loading data for nodejs/node/pull/46220
✔  Done loading data for nodejs/node/pull/46220
----------------------------------- PR info ------------------------------------
Title      test: refactor to avoid mutation of global by a loader (#46220)
Author     Michaël Zasso  (@targos)
Branch     targos:fix-resolve-type -> nodejs:main
Labels     test, esm, author ready
Commits    1
 - test: refactor to avoid mutation of global by a loader
Committers 1
 - Michaël Zasso 
PR-URL: https://github.com/nodejs/node/pull/46220
Reviewed-By: Antoine du Hamel 
Reviewed-By: Geoffrey Booth 
------------------------------ Generated metadata ------------------------------
PR-URL: https://github.com/nodejs/node/pull/46220
Reviewed-By: Antoine du Hamel 
Reviewed-By: Geoffrey Booth 
--------------------------------------------------------------------------------
   ℹ  This PR was created on Sun, 15 Jan 2023 12:07:37 GMT
   ✔  Approvals: 2
   ✔  - Antoine du Hamel (@aduh95) (TSC): https://github.com/nodejs/node/pull/46220#pullrequestreview-1249340907
   ✔  - Geoffrey Booth (@GeoffreyBooth) (TSC): https://github.com/nodejs/node/pull/46220#pullrequestreview-1249358333
   ✔  Last GitHub CI successful
   ℹ  Last Full PR CI on 2023-01-15T21:13:00Z: https://ci.nodejs.org/job/node-test-pull-request/48993/
   ⚠  Commits were pushed after the last Full PR CI run:
   ⚠  - test: refactor to avoid mutation of global by a loader
- Querying data for job/node-test-pull-request/48993/
   ✔  Last Jenkins CI successful
--------------------------------------------------------------------------------
   ✔  Aborted `git node land` session in /home/runner/work/node/node/.ncu

https://github.com/nodejs/node/actions/runs/3939092857

test/fixtures/es-module-loaders/hook-resolve-type.mjs

Co-authored-by: Antoine du Hamel <duhamelantoine1995@gmail.com>

nodejs-github-bot · 2023-01-18T21:35:05Z

CI: https://ci.nodejs.org/job/node-test-pull-request/49059/

nodejs-github-bot · 2023-01-19T00:14:09Z

Landed in cf8c699

This makes the test compatible with off-thread loaders. Co-Authored-By: Geoffrey Booth <webadmin@geoffreybooth.com> PR-URL: #46220 Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com> Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>

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Move ESM loaders off-thread #44710

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test: refactor to avoid mutation of global by a loader

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This makes the test compatible with off-thread loaders. Co-Authored-By: Geoffrey Booth <webadmin@geoffreybooth.com>

targos force-pushed the fix-resolve-type branch from 1cc9f59 to 825261e Compare January 16, 2023 07:10

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Update test/fixtures/es-module-loaders/hook-resolve-type.mjs

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Co-authored-by: Antoine du Hamel <duhamelantoine1995@gmail.com>

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v19.5.0 proposal #46286

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juanarbol mentioned this pull request Jan 28, 2023

V18.14.0 proposal #46396

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esm: delete preload mock test #46402

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test: refactor to avoid mutation of global by a loader #46220

test: refactor to avoid mutation of global by a loader #46220

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test: refactor to avoid mutation of global by a loader #46220

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