sleep function Null safety

void sleep(
  1. Duration duration

Sleep for the duration specified in duration.

Use this with care, as no asynchronous operations can be processed in a isolate while it is blocked in a sleep call.


void sleep(Duration duration) {
  int milliseconds = duration.inMilliseconds;
  if (milliseconds < 0) {
    throw new ArgumentError("sleep: duration cannot be negative");
  if (!_EmbedderConfig._maySleep) {
    throw new UnsupportedError(
        "This embedder disallows calling dart:io's sleep()");