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@webcomponents/scoped-custom-element-registry
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This polyfill explores implementation of a non-finalized spec proposal and is currently a work in progress.
Scoped CustomElementRegistry polyfill based on Scoped Custom Element Registries WICG proposal.
Technique: uses native CustomElements to register stand-in classes that
delegate to the constructor in the registry for the element's scope; this
avoids any manual treewalks to identify custom elements that need upgrading.
Constructor delegation is achieved by constructing a bare HTMLElement
,
inspecting its tree scope (or the tree scope of the node it was created via) to
determine its registry, and then applying the "constructor call trick" to
upgrade it.
Notes/limitations:
observedAttributes
handling
must be simulated by patching setAttribute
/getAttribute
to call
attributeChangedCallback
manually, since while we can delegate constructors,
the observedAttributes
respected by the browser are fixed at define time.
This means that native reflecting properties are not observable when set via
properties.Reflect.construct
may need to be modified in those casesOutstanding TODOs:
FAQs
Scoped CustomElementRegistry Polyfill
The npm package @webcomponents/scoped-custom-element-registry receives a total of 21,472 weekly downloads. As such, @webcomponents/scoped-custom-element-registry popularity was classified as popular.
We found that @webcomponents/scoped-custom-element-registry demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 4 open source maintainers collaborating on the project.
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