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Fix/prerender urls esm #1667

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merged 9 commits into from Mar 22, 2022
Merged

Fix/prerender urls esm #1667

merged 9 commits into from Mar 22, 2022

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rschristian
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What kind of change does this PR introduce?

Bugfix

Did you add tests for your changes?

Yes

Summary

Closes #1662

As the linked issue mentions, we require() the user's prerender-urls.js file which disallows import/export keywords. I'm guessing this used to work due to ESM not really being solidified in Node? Not entirely sure.

Fixed this by mirroring the process we already use for the user's preact.config.js files.

Does this PR introduce a breaking change?

No

@rschristian rschristian requested a review from a team as a code owner February 25, 2022 08:03
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changeset-bot bot commented Feb 25, 2022

🦋 Changeset detected

Latest commit: 4412b7d

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package
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preact-cli Patch

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One thing that might also be worth bringing up: I noticed that if a user provides a prerender-urls file, and it cannot be found or is malformed, we give a warning and move on with the default values. If the same happens for the preact.config, we throw an error and exit immediately.

Do we want to change this behavior so they match? I can't say I really have a preference for which way we go.

"jest": "^27.0.1",
"jest": "^24.9.0",
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Chased down the weird config file hack I introduced in #1623, turns out to be an issue in esm (the package, not the format) in Jest > v25.

Issue filed at jestjs/jest#12493, but I needed to use ESM within Jest and that hack only worked for CJS config files in our test suite. Downgrading shouldn't be problematic, so I went this route.

Comment on lines -124 to +122
if (result instanceof Array) {
if (Array.isArray(result)) {
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Not sure why this stopped working, but probably shouldn't be using instanceof anyhow

Comment on lines -117 to -119
info(`Fetching URLs from ${config.prerenderUrls}`);
result = await result();
info(`Fetched URLs from ${config.prerenderUrls}`);
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I don't think these info messages really provided any useful information.

@rschristian rschristian marked this pull request as draft February 25, 2022 10:36
@rschristian rschristian marked this pull request as ready for review February 25, 2022 20:27
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rschristian commented Mar 6, 2022

I was looking to add similar file handling for the babelConfig in v4 and the difference in preact config vs prerender urls was bothering me so I fixed it up here by extracting out a reusable handler for such situations.

No longer will a missing preact.config.js file result in a broken build; instead, it will continue on using the default (but printing a warning).

@rschristian rschristian merged commit a56d904 into master Mar 22, 2022
@rschristian rschristian deleted the fix/prerender-urls-esm branch March 22, 2022 19:40
@preact-bot preact-bot mentioned this pull request Mar 22, 2022
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Unexpected token export when using prerenderUrls
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