Some global symbols not available on globalThis

[kitsonk]

This issue isn't fixed for other symbols declared with declare class, which I think we decided to favour in the past. Seems like only declare var is accessible on globalThis, I think we need an upstream solution: microsoft/TypeScript#39504. cc @caspervonb @kitsonk

Originally posted by @nayeemrmn in #5666 (comment)

[sandersn]

In microsoft/TypeScript#39504, @ExE-Boss points out that declare class can't be accessible on globalThis because it contradicts JS semantics. Experimentation with V8 shows that it implements the semantics the same way.

[nayeemrmn]

@sandersn As similarly discussed in that issue we are looking for some other way to declare a class object which is accessible from globalThis e.g. declare var Foo: typeof class Foo {} doesn't work. A var class Foo {} syntax is proposed there.

Note that we specifically want to use class instead of

interface Foo {}
declare var Foo: {
  prototype: Foo;
  new(): Foo;
}

(even for web APIs where it isn't accurate) because it looks better in our generated docs.