prefer-effect-vitest

Intent: tests hand their Effects to @effect/vitest instead of running them.

// ❌ no
test("…", async () => {
    await Effect.runPromise(authorize({ role: "Manager" }))
})

// ✅ yes: fakes as Layers
import { effect } from "@effect/vitest"

effect("…", () => authorize({ role: "Manager" }).pipe(Effect.provide(sheetWith(row))))

Trigger: the same references as run-only-in-runner, inside test files only.

Exemptions and blind spots: projects where @effect/vitest cannot be found in a node_modules from the test file up, since the remedy is out of reach there; scattered runs in their tests go unreported. Every file outside testFiles, test helpers such as src/testing/ included.

Why: the test runtime brings TestClock and a scope per test, and fixtures provided as Layers replace services where the code reads them.

Options:

• testFiles: shared setting, see Shared settings.

Fix: none