fix(@angular/build): correct Vitest builder watch mode execution #30966
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The experimental Vitest-based unit test builder did not always correctly re-run tests in watch mode. This commit refactors the Vitest executor to provide more accurate watch mode behavior by: - Disabling Vitest's internal file watcher (`watch: null`) to make the Angular builder's watcher the single source of truth. - Triggering a test run via `vitest.rerunTestSpecifications()` within the `execute` method after each incremental build is complete.
The Vitest-based unit test builder created temporary output directories within `dist/test-out` for each run but did not remove them upon completion. This led to an accumulation of orphaned directories, consuming unnecessary disk space. This commit introduces robust cleanup logic to the `VitestExecutor` by: - Deleting the temporary output directory during graceful shutdown using the `asyncDispose` method. - Registering a `SIGINT` process handler to ensure the directory is also removed during forceful interruptions, such as when a user presses `Ctrl-C` in watch mode.
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The experimental Vitest-based unit test builder did not always correctly re-run tests in watch mode.
This commit refactors the Vitest executor to provide more accurate watch mode behavior by:
watch: null) to make the Angular builder's watcher the single source of truth.vitest.rerunTestSpecifications()within theexecutemethod after each incremental build is complete.