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esm: remove erroneous context.parentURL property passed to load hook #41975

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merged 4 commits into from Feb 18, 2022
+76 −1
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esm: remove erroneous context.parentURL property passed to load hook #41975

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5a9bf22
esm: remove erroneous `context.parentURL` property passed to `load` hook
JakobJingleheimer Feb 14, 2022
f733c70
fixup: ensure custom hooks are called & clarify import name
JakobJingleheimer Feb 15, 2022
b008799
fixup: add comments explaining purpose of new test set
JakobJingleheimer Feb 16, 2022
f39a2ca
fixup: avoid undesirably bypassing implementation
JakobJingleheimer Feb 17, 2022
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1 change: 0 additions & 1 deletion lib/internal/modules/esm/loader.js
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Expand Up @@ -282,7 +282,6 @@ class ESMLoader {
} = await this.load(url, {
format,
importAssertions,
parentURL,
});

const translator = translators.get(finalFormat);
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73 changes: 73 additions & 0 deletions test/es-module/test-esm-loader-hooks.mjs
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@@ -0,0 +1,73 @@
// Flags: --expose-internals
import { mustCall } from '../common/index.mjs';
import esmLoaderModule from 'internal/modules/esm/loader';
import assert from 'assert';

const { ESMLoader } = esmLoaderModule;

{
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Why this big block?

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😅 #41975 (review)

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Okay, but until you have the other cases it doesn’t make much sense to have just one block. I would also argue that perhaps other cases should be in new files, as this one’s already pretty large.

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I was thinking it would make sense to keep them in the same file. There are already a lot of files in this directory, many of which SEEM redundant (which makes it difficult to figure out what might or should be where). If the file gets renamed at the same time as more cases are added, git will likely break the history.

I could see removing the block for now and add it back when the other cases are added.

I would prefer to keep them in the same file though, unless they differ a lot or become unruly. Could I persuade you to wait and see?

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I’ve already approved, so you can do whatever. Maybe just add a comment at the top of the block saying this is here because you anticipate adding more blocks in the future, and what this block is meant to test.

const esmLoader = new ESMLoader();

const originalSpecifier = 'foo/bar';
const importAssertions = { type: 'json' };
const parentURL = 'file:///entrypoint.js';
const resolvedURL = 'file:///foo/bar.js';
const suggestedFormat = 'test';

function resolve(specifier, context, defaultResolve) {
assert.strictEqual(specifier, originalSpecifier);
assert.deepStrictEqual(Object.keys(context), [
'conditions',
'importAssertions',
'parentURL',
]);
assert.ok(Array.isArray(context.conditions));
assert.strictEqual(context.importAssertions, importAssertions);
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assert.strictEqual(context.parentURL, parentURL);
assert.strictEqual(typeof defaultResolve, 'function');

return {
format: suggestedFormat,
url: resolvedURL,
};
}

function load(resolvedURL, context, defaultLoad) {
assert.strictEqual(resolvedURL, resolvedURL);
assert.ok(new URL(resolvedURL));
assert.deepStrictEqual(Object.keys(context), [
'format',
'importAssertions',
]);
Comment on lines +46 to +49
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Can you make it clear somewhere that what you’re testing in this file is the signatures of the hooks? Like maybe name the file something like test-esm-loader-hooks-signatures.mjs, and add some comments near these assertions that what we’re doing here is testing that the expected arguments/properties exist and that unexpected ones don’t exist?

And I assume that’s all you’re aiming to test in this file?

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Can you make it clear somewhere that what you’re testing in this file is the signatures of the hooks? […] add some comments near these assertions that what we’re doing here is testing that the expected arguments/properties exist and that unexpected ones don’t exist?

Sure!

And I assume that’s all you’re aiming to test in this file?

No, I'm planning (in the near future) to add more tests for hooks themselves in this file (hence the generic file name). Those aren't relevant to this PR, so I didn't add them yet.

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It’s much easier to debug failing tests when each test file is as close as possible to one test per file, since you can re-run a test file like ./node test/es-module/test-esm-loader-hooks.mjs etc. The loader hooks API is large enough that I can’t imagine testing all of it in one file; you could make a subfolder for it perhaps.

assert.strictEqual(context.format, suggestedFormat);
assert.strictEqual(context.importAssertions, importAssertions);
assert.strictEqual(typeof defaultLoad, 'function');

// This doesn't matter (just to avoid errors)
return {
format: 'module',
source: '',
};
}

const customLoader1 = {
resolve: mustCall(resolve),
load: mustCall(load),
};

esmLoader.addCustomLoaders(customLoader1);

esmLoader.resolve(
originalSpecifier,
parentURL,
importAssertions,
);
esmLoader.load(
resolvedURL,
{
format: suggestedFormat,
importAssertions,
},
function mockDefaultLoad() {},
);
}