@testing-library/jest-dom/types/jest.d.ts

Custom jest matchers to test the state of the DOM

/// <reference types="jest" />

import {type TestingLibraryMatchers} from './matchers'

declare global {
  namespace jest {
    interface Matchers<R = void, T = {}>
      extends TestingLibraryMatchers<
        ReturnType<typeof expect.stringContaining>,
        R
      > {}
  }
}