General type updates

[saschanaz]

Adds WebGLRenderingContextBase.canvas and self.requestAnimationFrame() for worker, and exposes External global constructor.

Had to modify the code to process the special same-named properties canvas. Not super pretty but should be good enough for now.

[sandersn]

Questions about the namesakes code. Also, would a name like duplicateProperties or aliasedProperties be more precise?

[sandersn]

this is just a bugfix right?

[saschanaz]

That was my intention but looks like this is completely redundant. I'll remove this.

[sandersn]

it looks like this can happen more than once, but the code in mergeNamesakes assumes there's only one entry in each namesakes in line 20: for (const [prop] of .... Is that correct?

[saschanaz]

Yup, because in line 20 the namesakes value is already filtered by exposure ([Exposed] in IDL).

[saschanaz]

Questions about the namesakes code. Also, would a name like duplicateProperties or aliasedProperties be more precise?

It's not precisely "duplicated" or "aliased" because those properties are mutually exclusive (only one property should be alive and others will be filtered out, for each lib target):

interface X {
  [Exposed=Window] attribute Foo x; // This one will be used in dom.generated.d.ts
  [Exposed=Worker] attribute Bar x; // This one will be used in worker.generated.d.ts
};

"duplicate" makes me think those are same properties but they are not really same, so 🤔

[sandersn]

sounds like evilTwin might be the most accurate name :). Namesake is a fine name for now, in any case.