WebComponent lifecycle methods should not be marked as unused
As the subject says, lifecycle methods for WebComponents should not be marked as unused. I also have the official `Polymer & Web Components` plugin installed which is not helping. More info here https://developer.mozilla.org/en-US/docs/Web/Web_Components/Using_custom_elements#using_the_lifecycle_callbacks
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Please feel free to file a request to youtrack, https://youtrack.jetbrains.com/issues/WEB
Note that the support for web component is currently very limited. See https://youtrack.jetbrains.com/issue/WEB-49361 and linked tickets