vm: add support for import assertions in dynamic imports#40249

aduh95 · 2021-09-28T20:41:08Z

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doc/api/vm.md

aduh95 · 2021-10-01T08:54:17Z

Ping @nodejs/vm @nodejs/modules for reviews.

bmeck

Assert enforcement of spec for "type": "json" isn't in place but this is still experimental and I honestly don't have a clean way to enforce it even if we wanted to. We could treat this as a power/debugging tool which often lies outside of the spec? Seems fine for now but should revisit decision before unflagging.

nodejs-github-bot · 2021-10-01T14:18:00Z

CI: https://ci.nodejs.org/job/node-test-pull-request/40123/

GeoffreyBooth · 2021-10-01T17:04:17Z

In #40250 (comment) I asked if this could wait until that PR lands, or if this could land as part of that PR. There’s an unresolved discussion there about when and whether import assertions should be passed around between internal functions, which is what this PR adds; so it seems premature to land this until we’ve settled that question.

aduh95 · 2021-10-02T12:23:28Z

@GeoffreyBooth I've opened this PR to separate the changes in vm from the changes required to add support to the ESM loader. My reasoning was:

It avoids the discussion being limited to discussing loader implementation and JSON modules in particular. As a proof, the discussion in this thread has been productive, folks have made great suggestions that indeed improves the PR.
No matter what happens with the other PRs, we need to fix at some point the support in vm (currently it supports assertions only for static imports, not dynamic ones, which was almost certainly an oversight of vm: add import assertion support #37176).
Landing this would also simplify reviewing the other PRs.
If none of my other PRs land, I'd like to at least land this so all the work I put into it is not lost.
Landing this doesn't mean that no other changes can be made relative to import assertions support in vm, the ES modules support there is still experimental and behind a flag (well two flags even: --experimental-vm-modules --harmony-import-assertions).

That being said, of course I'm OK waiting if there are concerns, but if there are none, I'd rather have it landed, and a future PR can change the implementation again if it turns out being necessary.

guybedford

Seems like a nice simple change, and since VM doesn't relate to cache keying questions at all I don't see any reason not to land this.

devsnek · 2021-10-04T17:01:40Z

src/module_wrap.cc

+ Local<Object> assertions =
+Object::New(isolate, v8::Null(env->isolate()), nullptr, nullptr, 0);
+for (int i = 0; i < import_assertions->Length(); i += 2){
+ assertions
+ ->Set(env->context(),
+ Local<String>::Cast(import_assertions->Get(env->context(), i)),
+ Local<Value>::Cast(import_assertions->Get(env->context(), i + 1)))
+ .ToChecked();
+ }


if possible it might be good to dedupe this code with the static import path so they stay consistent

Done in adf6993.

nodejs-github-bot · 2021-10-05T20:33:19Z

CI: https://ci.nodejs.org/job/node-test-pull-request/40164/

GeoffreyBooth

I discussed with @aduh95; my concern about the function signature was whether the assertions would become part of the cache key. He tells me that he thinks that won’t be the case, in this PR at least. So I think this should be fine to land.

nodejs-github-bot · 2021-10-05T21:53:58Z

CI: https://ci.nodejs.org/job/node-test-pull-request/40168/

nodejs-github-bot · 2021-10-05T22:38:34Z

CI: https://ci.nodejs.org/job/node-test-pull-request/40170/

nodejs-github-bot · 2021-10-06T07:30:13Z

CI: https://ci.nodejs.org/job/node-test-pull-request/40175/

nodejs-github-bot · 2021-10-09T07:31:29Z

CI: https://ci.nodejs.org/job/node-test-pull-request/40226/

github-actions · 2021-10-09T08:44:55Z

Landed in 879ff77...08ffbd1

PR-URL: #40249 Reviewed-By: Bradley Farias <[email protected]> Reviewed-By: Guy Bedford <[email protected]> Reviewed-By: Gus Caplan <[email protected]> Reviewed-By: Geoffrey Booth <[email protected]>

Notable changes: deps: * upgrade npm to 8.1.0 (npm team) #40463 doc: * deprecate (doc-only) http abort related (dr-js) #36670 vm: * (SEMVER-MINOR) add support for import assertions in dynamic imports (Antoine du Hamel) #40249 PR-URL: #40504

Notable Changes: Experimental ESM Loader Hooks API: Node.js ESM Loader hooks have been consolidated to represent the steps involved needed to facilitate future loader chaining: 1. `resolve`: `resolve` [+ `getFormat`] 2. `load`: `getFormat` + `getSource` + `transformSource` For consistency, `getGlobalPreloadCode` has been renamed to `globalPreload`. A loader exporting obsolete hook(s) will trigger a single deprecation warning (per loader) listing the errant hooks. Contributed by Jacob Smith, Geoffrey Booth, and Bradley Farias - #37468 Other Notable Changes: deps: * upgrade npm to 8.1.0 (npm team) #40463 doc: * deprecate (doc-only) http abort related (dr-js) #36670 vm: * (SEMVER-MINOR) add support for import assertions in dynamic imports (Antoine du Hamel) #40249 PR-URL: #40504

Ashoat · 2022-05-20T21:48:32Z

Running Node 16.13.2, I see the following when I try to specify an import assertion on a dynamic import():

 const importedJSON = await import(`../../${path}`,{^ SyntaxError: Unexpected token ','

I think Node 16.3.2 includes this commit, but I'm guessing there's another one that's necessary in order for this to work?

Thanks in advance for any response, and sorry for pinging the PR like this.

aduh95 · 2022-05-20T22:25:49Z

You need to use the --harmony-import-assertions CLI flag, or even better update to Node.js v16.15+.

aduh95 requested a review from devsnek September 28, 2021 20:41

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aduh95 added 2 commits October 5, 2021 19:23

vm: add support for import assertions in dynamic imports
085b12c

fixup! vm: add support for import assertions in dynamic imports
adf6993

aduh95 force-pushed the vm-import-assertion-dynamic branch from 9c2964f to adf6993Compare October 5, 2021 17:31

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BethGriggs mentioned this pull request Oct 14, 2021
2021-10-19, Version 17.0.0 (Current) #40119
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richardlau mentioned this pull request Oct 18, 2021
v16.12.0 proposal #40504
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mischnic mentioned this pull request Apr 11, 2022
Drop Node 12 in tests and add Node 16 parcel-bundler/parcel#7935
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vm: add support for import assertions in dynamic imports#40249

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