P3help wanted
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説明
A variable assignment with 2 @extends annotations gave this warning using NTI:
WARNING - Bad type annotation. type annotation incompatible with other annotations. See https://github.com/google/closure-compiler/wiki/Bad-Type-Annotation for more information.
That could be a lot better (more helpful).
/**
* @constructor
* @extends {Polymer.Element}
* @extends {ObservableModelsElement}
*/
const CardElement = observableModelsMixin(cardUtilsMixin(Polymer.GestureEventListeners(Polymer.Element)));