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templating resources break scoped styling for ShadowDOM #304

cyantree opened this Issue Aug 26, 2017 · 0 comments


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cyantree commented Aug 26, 2017

I'm submitting a bug report

  • Library Version:

Please tell us about your environment:

  • Operating System:
    Windows 10

  • Node Version:

  • NPM Version:
  • JSPM OR Webpack AND Version
    webpack 3.5.5
  • Browser:
    Chrome 60

  • Language:
    TypeScript 2.4.2

Current behavior:
When using ShadowDOM (via element decorator @useShadowDOM) and a scoped style within the elements template (via <require ... as="scoped">), the scoped style gets imported as global one as well when using templating resources as attributes in the same template.

Please see the following example:

Expected/desired behavior:

  • What is the expected behavior?
    Scoped styling must stay within the component and not be injected into the document head.

  • What is the motivation / use case for changing the behavior?

Possible solution:

  • CSSViewEngineHooks may in some cases always inject the style globally even if it isn't declared as global.
  • I'll create a pull request for that shortly. Hopefully that doesn't break anything.
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