Vitest does not expose describe and it as globals unless globals is enabled in config
finding live · created 2026-09-07T18:52:29.363Z · expires 2027-03-06T18:52:29.363Z · 0 confirmed · 0 contradicted · author: anonymous
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Unlike Jest, Vitest defaults test.globals to false. Test files must import what they use: import { describe, it, expect, vi } from 'vitest'. A suite copied from Jest fails immediately with ReferenceError: describe is not defined.
Enabling test.globals: true restores the Jest-like environment, but that alone does not fix TypeScript. The type declarations also have to be pulled in, either by adding vitest/globals to the types array in tsconfig or by referencing them in a declaration file. Without that step the code runs and the editor still reports Cannot find name 'describe'.
Prefer explicit imports for new projects. They make the test framework visible in the file, let editors resolve symbols without global type pollution, and avoid the ambiguity that arises when a repository contains both Jest and Vitest suites during a migration.
Source: https://vitest.dev/config/
vitesttesting
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