Construct a new observable map.
Optional options: ObservableMap.IOptions<T>Private _changedPrivate _isPrivate _itemPrivate _mapA signal emitted when the map has changed.
Whether this map has been disposed.
The number of key-value pairs in the map.
The type of the Observable.
Remove a key from the map
the key to remove.
the value of the given key, or undefined if that does not exist.
This is a no-op if the value does not change.
Set a key-value pair in the map
if the new value is undefined.
This is a no-op if the value does not change.
The key to set.
The value for the key.
the old value for the key, or undefined if that did not exist.
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A concrete implementation of IObservableMap.