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esm: fix esm load bug #25491

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esm: fix esm load bug #25491

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ZYSzys
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@ZYSzys ZYSzys commented Jan 14, 2019

If module.reflect is undefined, just run into else condition.

Fixes: #25482

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • commit message follows commit guidelines

@guybedford
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Unfortunately we can't just override the module map - it has to be treated as an immutable map otherwise we can possibly get race conditions in loading / different instances.

The fix here has to be to ensure the onReady function is available as soon as the moduleMap entry is set.

@guybedford
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(or change the architecture to not need an onReady)

@ZYSzys
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ZYSzys commented Jan 14, 2019

So how should this to be fixed specifically ?Can you please give me some more guides ?

I've changed it like we previously did: https://github.com/nodejs/node/pull/24560/files#diff-76195ce57689942222a27f0dbda6d3b7L641

Sincerely /cc @devsnek who actual implement the refactor in #24560 (comment)

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devsnek commented Jan 14, 2019

lite ci run to see if this fix passes https://ci.nodejs.org/job/node-test-pull-request-lite-pipeline/2243/

@guybedford
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One thing to try might be checking if reflect is available once module.modulePromise has resolved. It would be good to get a test case that captures what is happening in #25482 as well.

Thanks @ZYSzys for your efforts here.

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devsnek commented Jan 14, 2019

the current change passes all tests, so maybe we're on to something?

cc @bmeck for some hopeful insight

@targos targos added the esm Issues and PRs related to the ECMAScript Modules implementation. label Apr 25, 2019
@guybedford
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So the problem here is that the CJS cache injects into the ESM loader so they share the same instances, but in the case where the ESM loader has already loaded the module, the CJS version should not override the existing ESM version.

So the fix is correct.

I've merged the test case from #27443 into this PR, and can confirm it is fully resolved.

Please lets land this soon and backport the patch as well.

@guybedford guybedford added python PRs and issues that require attention from people who are familiar with Python. and removed python PRs and issues that require attention from people who are familiar with Python. labels May 12, 2019
@devsnek devsnek added the experimental Issues and PRs related to experimental features. label May 12, 2019
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LGTM, but I'd prefer we cherry-pick or am in the test to preserve authorship for the contributor who wrote it, unless there's a good reason not to do that.

ZYSzys and others added 3 commits May 13, 2019 17:37
This test shows the regression introduced in v11.4.0: clearing out the
require.cache crashes node when using the `--experimental-modules` flag.
Refs: nodejs#25482
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ZYSzys commented May 13, 2019

@Trott I've cherry-pick the test and will squash the last fixup when landed, is it ok now ?

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Thanks @ZYSzys for updating that - of course we should retain the original commit.

ZYSzys added a commit that referenced this pull request May 14, 2019
Fixes: #25482

PR-URL: #25491
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
ZYSzys pushed a commit that referenced this pull request May 14, 2019
This test shows the regression introduced in v11.4.0: clearing out the
require.cache crashes node when using the `--experimental-modules` flag.
Refs: #25482

PR-URL: #25491
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
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ZYSzys commented May 14, 2019

Landed in 523a9fb...ac3b98c

@aduh95 Thanks and congratulate for your first(Oh, it's not your first time 😅, but still congratulate) contribution to Node.js core 🎉.

@ZYSzys ZYSzys closed this May 14, 2019
@ZYSzys ZYSzys deleted the fix-esm-bug branch May 14, 2019 08:57
targos pushed a commit that referenced this pull request May 14, 2019
Fixes: #25482

PR-URL: #25491
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
targos pushed a commit that referenced this pull request May 14, 2019
This test shows the regression introduced in v11.4.0: clearing out the
require.cache crashes node when using the `--experimental-modules` flag.
Refs: #25482

PR-URL: #25491
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
@BridgeAR BridgeAR mentioned this pull request May 21, 2019
4 tasks
BethGriggs pushed a commit that referenced this pull request Jun 6, 2019
Fixes: #25482

Backport-PR-URL: #27874
PR-URL: #25491
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
BethGriggs pushed a commit that referenced this pull request Jun 6, 2019
This test shows the regression introduced in v11.4.0: clearing out the
require.cache crashes node when using the `--experimental-modules` flag.
Refs: #25482

Backport-PR-URL: #27874
PR-URL: #25491
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
@BethGriggs BethGriggs mentioned this pull request Jul 17, 2019
abhishekumar-tyagi pushed a commit to abhishekumar-tyagi/node that referenced this pull request May 5, 2024
Fixes: nodejs/node#25482

PR-URL: nodejs/node#25491
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
abhishekumar-tyagi pushed a commit to abhishekumar-tyagi/node that referenced this pull request May 5, 2024
This test shows the regression introduced in v11.4.0: clearing out the
require.cache crashes node when using the `--experimental-modules` flag.
Refs: nodejs/node#25482

PR-URL: nodejs/node#25491
Reviewed-By: Guy Bedford <guybedford@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>
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esm: Bug in dynamic modules refactoring
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