microsoft / microsoft/TypeScript
Convert HTMLElement and friends to classes to support Web Components/Custom elements
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Description
Please model HTMLElement and its subclasses as classes instead of interfaces in lib.d.ts to make it possible to subclass them.
My motivation is custom elements and web components. To create a custom element you need to create a subclass of HTMLElement and register it with the browser. Currently, HTMLElement etc are interfaces and can't be subclassed. I've been using a hacked lib.d.ts in my pet TypeScript project which uses web components.
Tutorial and info about how to use custom elements is here: http://www.html5rocks.com/en/tutorials/webcomponents/customelements/
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start in lib.d.ts, where HTMLElement and its subclasses are currently declared as interfaces. Read the custom-elements motivation and inspect the surrounding DOM declarations to understand the affected hierarchy. Done means the declarations support subclassing HTMLElement and related elements for web components without breaking existing usage.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- frontend
- Issue type
- Feature
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100