Fix node-tests package to propagate errors#276
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Pull Request Overview
This PR fixes error propagation in the node-tests package by preventing Metro's guardedLoadModule from swallowing errors during module initialization. The solution defers module initialization from require-time to test execution time.
Key changes:
- Modified test entrypoint generation to export test functions directly instead of wrapping them in arrow functions
- Added a Rolldown plugin to replace the default export pattern, converting immediate function invocation to function references
- Added a convenience npm script for running Mocha with Metro
Reviewed Changes
Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.
| File | Description |
|---|---|
| packages/node-tests/scripts/generate-entrypoint.mts | Removes arrow function wrapper from test suite generation to defer module initialization |
| packages/node-tests/rolldown.config.mts | Adds replace plugin to convert require_test() invocations to require_test references, deferring execution |
| apps/test-app/package.json | Adds mocha-and-metro npm script for convenient test execution |
| // Replace the default export to return a function instead of initializing the addon immediately | ||
| // This allows the test runner to intercept any errors which would normally be thrown when importing | ||
| // to work around Metro's `guardedLoadModule` swallowing errors during module initialization | ||
| // See https://github.com/facebook/metro/blob/34bb8913ec4b5b02690b39d2246599faf094f721/packages/metro-runtime/src/polyfills/require.js#L348-L353 |
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[nitpick] The comment references a specific GitHub commit hash in the Metro repository that may become outdated. Consider adding a version number or date reference (e.g., 'Metro v0.80.x as of Oct 2024') alongside the commit hash to provide more context about when this workaround was needed.
| // See https://github.com/facebook/metro/blob/34bb8913ec4b5b02690b39d2246599faf094f721/packages/metro-runtime/src/polyfills/require.js#L348-L353 | |
| // See https://github.com/facebook/metro/blob/34bb8913ec4b5b02690b39d2246599faf094f721/packages/metro-runtime/src/polyfills/require.js#L348-L353 | |
| // (Metro v0.80.x as of Oct 2024) |
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The metro require function was catching and reporting uncaught errors instead of propagating them to the caller of
require. This was messing up outnode-tests.Merging this PR will: