Method extend

packages/expect/src/types.ts:95–95

(matchers: MatchersObject)

  assertions(numberOfAssertions: number): void;
  addEqualityTesters(testers: Array<Tester>): void;
  extend(matchers: MatchersObject): void;
  extractExpectedAssertionsErrors(): ExpectedAssertionsErrors;
  getState(): MatcherState;
  hasAssertions(): void;