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Discussion on: Why I don't use web components

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Darien Maillet Valentine

7 is interesting to me. The lifecycle callbacks are stored at definition time, not accessed dynamically when the lifecycle events occur, despite being implemented on a prototype. In other words, CustomElementRegistry.prototype.define’s constructor argument is doing double-duty: it’s both the element constructor and an (unusually nested) options object.

From my POV, this seems like a ‘dishonest’ API. On the other hand, I think I understand the decision: it permits subclasses of custom elements to delegate to the lifecycle hooks of their super class. I wouldn’t have made the same design choice personally, but it is possible to delete the public-properties-that-are-really-private-config-options immediately after definition — the leak can be entirely closed.