Function afterWrite

lib/internal/streams/writable.js:699–720

(stream, state, count, cb)

}

function afterWrite(stream, state, count, cb) {
  state[kState] &= ~kAfterWritePending;

  const needDrain = (state[kState] & (kEnding | kNeedDrain | kDestroyed)) === kNeedDrain && state.length === 0;
  if (needDrain) {
    state[kState] &= ~kNeedDrain;
    stream.emit('drain');
  }

  while (count-- > 0) {
    state.pendingcb--;
    cb(null);
  }

  if ((state[kState] & kDestroyed) !== 0) {
    errorBuffer(state);
  }

  if ((state[kState] & kEnding) !== 0) {
    finishMaybe(stream, state, true);
  }
}

// If there's something in the buffer waiting, then invoke callbacks.
function errorBuffer(state) {