I wrote a custom matcher with expect.extend

expect.extend({
  toEqualIgnoringWhitespace(got: string, want: string) {
    return {
      pass: got.trim().replace(/s+/g, ``) === want.trim().replace(/s+/g, ``),
      message: () => `Even with whitespace removed, ${got} does not equal ${want}.`
    };
  }
});

And as recommended by the docs I added a vitest.d.env

interface CustomMatchers<R = unknown> {
  toEqualIgnoringWhitespace: () => R
}

declare module 'vitest' {
  type Assertion<T = any> = CustomMatchers<T>
  interface AsymmetricMatchersContaining extends CustomMatchers {}
}

And I followed the docs:

Don’t forget to include the ambient declaration file in your tsconfig.json.

  "include": ["vitest.d.ts","env.d.ts", "**/*.ts", "**/*.tsx"],

But now Typescript doesn’t know about the rest of vitest. Using test.extend, use and task implicitly have any type.

const it = test.extend<{ row: EventRow }>({
  row: async ({ task }, use) => {  // errors here
    ...

It got clearer when I tried to import stuff from vitest and TS didn’t recognize of the normal things like expect (I’m using globals for describe, it, etc; I tried these imports as a test). it only suggests the two things from the .d.env I pasted from the docs.

So it looks like I’m doing something wrong in either the tsconfig or the .d.env file but I don’t know how to fix it.