Function destroy

lib/internal/streams/iter/classic.js:294–308

(err, cb)

      }
    },
    destroy(err, cb) {
      done = true;
      // Wake up the pump if it's waiting on backpressure so it
      // can see done === true and exit cleanly.
      if (backpressure) {
        backpressure.resolve();
        backpressure = null;
      }
      if (typeof iterator.return === 'function') {
        PromisePrototypeThen(iterator.return(),
                             () => cb(err), (e) => cb(e || err));
      } else {
        cb(err);
      }
    },
  });

  if (signal) {