Add default values to TypeScript declaration files

Description of the problem

Having definitions helps a lot but they are lacking the proper setting of the default value. It is usually in the comment just above each property so is there any blocker to include them as well.

See for instance:

https://github.com/mrdoob/three.js/blob/4a8c4ae51943f04ba94d04339e671bfe075c41ca/src/renderers/WebGLRenderer.d.ts#L128-L141

could be:

export class WebGLRenderer implements Renderer {
// ...
 	autoClearColor: boolean = true; 
 	autoClearDepth: boolean = true; 
 	autoClearStencil: boolean = true; 
// ...
}

It shouldn’t be an issue since types are actually exporting classes and not just declareing them and could help parsing the codebase and monitor default allocations.

Three.js version

N/A

Browser

N/A

OS

N/A

Hardware Requirements (graphics card, VR Device, …)

N/A

[dmnsgn]

Alright @mrdoob, I have opened the PR here: https://github.com/mrdoob/three.js/pull/20036. For maintaining it, I guess you can tag me in the future if defaults changes and these needs to be updated?

[dmnsgn]

I might be able to update the initial comment definitions and PR, then I assume if defaults are changed for some reason in the js source files, the ts declaration files should be checked in parallel with the PR or when merging.

---

@donmccurdy just tried in VSCode and it does: if I update WebGLRenderer.d.ts in node_modules/three with @default true:

        /**
	 * If autoClear is true, defines whether the renderer should clear the color buffer. Default is true.
         * @default true
	 */
	autoClearColor: boolean;

it will appear: