vitest/prefer-import-in-mock

TypeScript doesn't check a path that's written as a string. With vi.mock(import("./api")) it knows which module is mocked, so a wrong path is a type error and importOriginal() in the factory has the module's type.

--fix wraps the string in import().

Configure

Off by default. To turn it on:

[lint.rules]
"vitest/prefer-import-in-mock" = "error" # or "warn"

Every option, set to its default:

[lint.rules]
"vitest/prefer-import-in-mock" = ["error", {
  fixable = true,
}]

Examples

Reported:

import { vi } from "vitest";

vi.mock("./api", async importOriginal => {
  const api = await importOriginal();
  return { ...api, fetchUser: vi.fn() };
});

Not reported:

import { vi } from "vitest";

vi.mock(import("./api"), async importOriginal => {
  const api = await importOriginal();
  return { ...api, fetchUser: vi.fn() };
});

Options

Option	Default	What it does
fixable	true	Set it to false to keep the report but leave the code alone with --fix.

import { vi } from "vitest";

vi.doMock("./api");