1. Dart
2. dart:html
3. UnderlyingSourceBase
4. start method

##### UnderlyingSourceBase class

1. Properties
2. hashCode
3. runtimeType
4. Methods
5. cancel
6. noSuchMethod
7. notifyLockAcquired
8. notifyLockReleased
9. pull
10. start
11. toString
12. Operators
13. operator ==

description

# start method Null safety

Future start (

1. Object stream

)

## Implementation

    Future start(Object stream) =>
        promiseToFuture(JS("", "#.start(#)", this, stream));