sp webpart base.baseclientsidewebpart.renderedfrompersisteddata - microsoft/Viva-Connections-Extensibility-Beta GitHub Wiki
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This property indicates whether the web part was rendered from the persisted data (serialized state from the last time that the web part was saved) or not.
Signature:
protected get renderedFromPersistedData(): boolean;Example: When web part is added for the first time using toolbox then the value is false.