startSync method Null safety

void startSync(
  1. String name,
  2. {Map? arguments,
  3. Flow? flow}
)

Start a synchronous operation labeled name. Optionally takes a Map of arguments. This slice may also optionally be associated with a Flow event. This operation must be finished before returning to the event queue.

Implementation

static void startSync(String name, {Map? arguments, Flow? flow}) {
  if (!_hasTimeline) return;
  // TODO: When NNBD is complete, delete the following line.
  ArgumentError.checkNotNull(name, 'name');
  if (!_isDartStreamEnabled()) {
    // Push a null onto the stack and return.
    _stack.add(null);
    return;
  }
  var block = new _SyncBlock._(name, _getNextTaskId(),
      arguments: arguments, flow: flow);
  _stack.add(block);
  block._startSync();
}