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module: package exports dot main support #29494

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guybedford
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This reintroduces the dot main in exports as discussed in the previous Node.js modules meeting.

The implementation includes both CommonJS and ES module resolution with the associated documentation and resolver specification changes.

In addition to the dot main, "exports" as a string or direct fallback array is supported as well.

Checklist
  • make -j4 test (UNIX), or vcbuild test (Windows) passes
  • tests and/or benchmarks are included
  • documentation is changed or added
  • commit message follows commit guidelines

@nodejs-github-bot nodejs-github-bot added the c++ Issues and PRs that require attention from people who are familiar with C++. label Sep 8, 2019
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//cc @nodejs/modules-active-members

@guybedford guybedford requested a review from jkrems September 8, 2019 17:09
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guybedford and others added 3 commits September 8, 2019 15:29
Co-Authored-By: Geoffrey Booth <GeoffreyBooth@users.noreply.github.com>
Co-Authored-By: Geoffrey Booth <GeoffreyBooth@users.noreply.github.com>
@benjamingr
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Random governance question - who is supposed to approve these changes? Modules team members or core collaborators?

Has the TSC chartered the module team to make changes to this area of the code on its own or something similar?

(I am asking because I see two approvals by non-collaborator members and I am a bit confused if those LGTMs are "I agree with this change and it can land" "I agree with this change" or "This is what the team said" and if regular collaborators are expected to review those or not)

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devsnek commented Sep 8, 2019

cc @MylesBorins ^

@guybedford
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@benjamingr the standard Node.js core approval process applies since the modules group is not chartered. We typically seek consensus from the modules group before landing non-patch changes to the module system though.

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Thanks for explaining @guybedford!

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LGTM in general but I'd prefer if we can remove the duplication between the code for . and other exports keys.

target =
exports_obj->Get(env->context(), dot_string).ToLocalChecked();
}
if (target->IsString()) {
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Is there a way to reuse the existing logic for string/array in PackageExportsResolve?

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@guybedford guybedford Sep 9, 2019

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That would be better, it's just a refactoring I haven't had the time for. Would you be ok with moving that to a follow-up?

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Works for me.

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It's worth noting here, that:

{
  "exports": "./esm-main.js"
}

is supported by this PR, but:

{
  "exports": "esm-main.js"
}

would not be supported and would throw an error that exports must start with ./.

This is based on various long-standing discussions, but still worth noting in how it deviates from "main".

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LGTM

@guybedford guybedford added the author ready PRs that have at least one approval, no pending requests for changes, and a CI started. label Sep 16, 2019
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jkrems commented Sep 16, 2019

🍏

@Trott
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Trott commented Sep 18, 2019

Landed in 3f3ad38

@Trott Trott closed this Sep 18, 2019
Trott pushed a commit that referenced this pull request Sep 18, 2019
This reintroduces the dot main in exports as discussed in the previous
Node.js modules meeting.

The implementation includes both CommonJS and ES module resolution with
the associated documentation and resolver specification changes.

In addition to the dot main, "exports" as a string or direct fallback
array is supported as well.

Co-Authored-By: Geoffrey Booth <GeoffreyBooth@users.noreply.github.com>
PR-URL: #29494
Reviewed-By: Jan Krems <jan.krems@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
targos pushed a commit that referenced this pull request Sep 20, 2019
This reintroduces the dot main in exports as discussed in the previous
Node.js modules meeting.

The implementation includes both CommonJS and ES module resolution with
the associated documentation and resolver specification changes.

In addition to the dot main, "exports" as a string or direct fallback
array is supported as well.

Co-Authored-By: Geoffrey Booth <GeoffreyBooth@users.noreply.github.com>
PR-URL: #29494
Reviewed-By: Jan Krems <jan.krems@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
@BridgeAR BridgeAR mentioned this pull request Sep 24, 2019
BridgeAR pushed a commit that referenced this pull request Sep 25, 2019
This reintroduces the dot main in exports as discussed in the previous
Node.js modules meeting.

The implementation includes both CommonJS and ES module resolution with
the associated documentation and resolver specification changes.

In addition to the dot main, "exports" as a string or direct fallback
array is supported as well.

Co-Authored-By: Geoffrey Booth <GeoffreyBooth@users.noreply.github.com>
PR-URL: #29494
Reviewed-By: Jan Krems <jan.krems@gmail.com>
Reviewed-By: Myles Borins <myles.borins@gmail.com>
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9 participants