fix(@angular/build): disable Vitest test isolation by default #31826
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Disables test isolation in Vitest by setting `isolate: false` in the default Vitest configuration. This change aligns the default test isolation behavior with the existing Karma/Jasmine experience, promoting standardization across testing frameworks within the Angular CLI. This also provides significant performance improvements, especially in browser mode, by reducing the overhead associated with test isolation. All known issues related to disabling isolation have been addressed.
clydin
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target: rc
dgp1130
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Nov 15, 2025
clydin
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action: merge
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Disables test isolation in Vitest by setting
isolate: falsein the default Vitest configuration. This change aligns the default test isolation behavior with the existing Karma/Jasmine experience, promoting standardization across testing frameworks within the Angular CLI.This also provides significant performance improvements, especially in browser mode, by reducing the overhead associated with test isolation. All known issues related to disabling isolation have been addressed.