Vitest 50 Drills: TypeScript Unit Testing from the Ground Up

I can copy Jest's syntax. But I can't explain why it's written that way. — This course exists to get you out of exactly that state.Vitest is a test runner that reuses Vite's transform pipeline directly to execute your tests. Once you grasp this single fact, everything connects on one line: why TypeScript runs with zero config, why `vi.mock` takes effect before your imports, why Promises don't res…