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fix(testing): resolve jest utils in plugin from the @jest/core packag…
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…e location that jest uses (#27422)

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## Current Behavior
<!-- This is the behavior we have today -->

In the `@nx/jest/plugin` some jest utils are imported from the location
of the `jest` package to ensure the plugin uses the same utils the
`jest` package would use. This is not entirely correct because the
`jest` package doesn't directly depend on those utils, so they might not
be resolved correctly.

## Expected Behavior
<!-- This is the behavior we should expect with the changes in this PR
-->

The `@nx/jest/plugin` should import those jest utils from the location
of the `@jest/core` package resolved from the `jest` package location,
to ensure the plugin uses the same utils the `jest` package would use.

## Related Issue(s)
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merged. -->

Fixes #
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leosvelperez authored Aug 14, 2024
1 parent 8de36d7 commit 17f09bc
Showing 1 changed file with 12 additions and 1 deletion.
13 changes: 12 additions & 1 deletion packages/jest/src/plugins/plugin.ts
Original file line number Diff line number Diff line change
Expand Up @@ -436,6 +436,7 @@ function resolveJestPath(projectRoot: string, workspaceRoot: string): string {
return resolvedJestPaths[projectRoot];
}

let resolvedJestCorePaths: Record<string, string>;
/**
* Resolves a jest util package version that `jest` is using.
*/
Expand All @@ -446,5 +447,15 @@ function requireJestUtil<T>(
): T {
const jestPath = resolveJestPath(projectRoot, workspaceRoot);

return require(require.resolve(packageName, { paths: [dirname(jestPath)] }));
resolvedJestCorePaths ??= {};
if (!resolvedJestCorePaths[jestPath]) {
// nx-ignore-next-line
resolvedJestCorePaths[jestPath] = require.resolve('@jest/core', {
paths: [dirname(jestPath)],
});
}

return require(require.resolve(packageName, {
paths: [dirname(resolvedJestCorePaths[jestPath])],
}));
}

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