Function delegate

showcase/scripts/__tests__/create-integration.test.ts:696–705

(
      p: fs.PathOrFileDescriptor,
      ...rest: unknown[]
    )

    // validate-parity.test.ts / manifest.test.ts.
    const realRead = fs.readFileSync;
    const delegate = (
      p: fs.PathOrFileDescriptor,
      ...rest: unknown[]
    ): string | Buffer =>
      (
        realRead as unknown as (
          p: fs.PathOrFileDescriptor,
          ...rest: unknown[]
        ) => string | Buffer
      )(p, ...rest);

    // Case 1: ENOENT (file missing).
    {