Method use

packages/testlab/should-as-function.d.ts:198–198

(fn: (should: Internal, Assertion: Assertion) => void)

  // Simple utility function for a bit more easier should assertion extension
  use(fn: (should: Internal, Assertion: Assertion) => void): Internal;

  // node.js's assert functions
  fail(actual: any, expected: any, message: string, operator: string): void;