jest → vitest

@omnimod/plugin-jest-to-vitest migrates Jest test files to Vitest. The two share most of their surface, so the change is mostly the jest global becoming vi plus the import source.

omnimod run jest-to-vitest "**/*.{test,spec}.{ts,tsx,js,jsx}" --write

The target project needs vitest installed.

Example

// before
const fn = jest.fn();
jest.spyOn(obj, "m");

// after
import { vi } from "vitest";
const fn = vi.fn();
vi.spyOn(obj, "m");

Automated

• jest.* → vi.* (fn, mock, spyOn, useFakeTimers, clearAllMocks, …).
• Prepends import { vi } from "vitest" when vi is used and not yet imported.
• Rewrites @jest/globals imports to vitest.

Flagged for follow-up

• Test globals (describe/it/test/expect) are left as-is with an info diagnostic — enable test: { globals: true } in your Vitest config or import them from vitest.
• Complex module mocks, setup files, and jest.requireActual need manual review.