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Migration Guide
Migrating from Jest
Vitest has been designed with a Jest compatible API, in order to make the migration from Jest as simple as possible. Despite those efforts, you may still run into the following differences:
Globals as a Default
Jest has their globals API enabled by default. Vitest does not. You can either enable globals via the globals configuration setting or update your code to use imports from the vitest module instead.
If you decide to keep globals disabled, be aware that common libraries like testing-library will not run auto DOM cleanup.
Auto-Mocking Behaviour
Unlike Jest, mocked modules in <root>/__mocks__ are not loaded unless vi.mock() is called. If you need them to be mocked in every test, like in Jest, you can mock them inside setupFiles.
Jasmine API
Jest exports various jasmine globals (such as jasmine.any()). Any such instances will need to be migrated to their Vitest counterparts.