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Vitest · Function

assertType

assertType<T>(value) checks that a value has the expected TypeScript type. It only matters during Vitest type checking, not during normal runtime tests.

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Syntax

<T>(value: T): void

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  • expectTypeOf
  • typecheck.include
  • *.test-d.ts
  • --typecheck

Source: assertType | Vitest. Checked 2026-11-03.