Common Matchers in Vitest
From the Vitest cheat sheet · Assertions · verified Nov 2026
Common Matchers
Equality, truthiness, numbers, strings, collections, types, and errors
typescript
expect(2 + 2).toBe(4) // Object.is
expect(user).toEqual({ id: 1, name: 'Ada' }) // deep equality
expect(user).toMatchObject({ name: 'Ada' }) // subset
expect(list).toContain('apple')
expect(list).toHaveLength(3)
expect(0.1 + 0.2).toBeCloseTo(0.3)
expect(() => parse('')).toThrow('empty input')📌 toBe uses Object.is; use toEqual for objects and arrays
🔍 toStrictEqual also checks undefined props, sparse arrays and classes
⚠️ toThrow needs a function wrapper: expect(() => fn()).toThrow()
💡 toThrowError is a deprecated alias in v5; use toThrow
expectmatcherstoEqualtoThrow
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