Opaque types for WebGL

WebGL types are included in the default lib.d.ts. However, most types are defined as empty interfaces, which means that the compiler doesn't catch many WebGL errors.

Consider the following code:

function foo(gl: WebGLRenderingContext, fbo: WebGLFramebuffer) {
  gl.bindFramebuffer(gl.FRAMEBUFFER, fbo); // Correct call
  gl.bindFramebuffer(gl.FRAMEBUFFER, "abc"); // This should be a compile error!

  fbo = gl.createFramebuffer(); // Correct call
  fbo = new WebGLFramebuffer; // This should be a compile error!
}

• The second parameter of gl.bindFramebuffer should be a WebGLFramebuffer object, but passing a string does not emit a compile error or warning.
• The type WebGLFramebuffer can only be constructed via WebGLRenderingContext.createFramebuffer, calling new throws an error at runtime

Ideally, Typescript would know that WebGLFramebuffer, even though it has no public properties, cannot be constructed or converted to any other type.
I assume that this is not easy to specify with structural typing, but having such opaque types could be useful for other libraries as well (e.g., for returning handles).

If that is not possible, can we find a workaround that at least helps catching the above mentioned bugs?

For reference, here's how the above types are currently defined in lib.d.ts:

interface WebGLFramebuffer extends WebGLObject {
}
declare var WebGLFramebuffer: {
    prototype: WebGLFramebuffer;
    new(): WebGLFramebuffer;
}
interface WebGLRenderingContext {
    bindFramebuffer(target: number, framebuffer: WebGLFramebuffer): void;
    // + many other methods
}

Beginne mit den in lib.d.ts gezeigten Definitionen von WebGLFramebuffer und WebGLRenderingContext und verfolge dann, wie der Compiler ihre strukturellen Typen und Konstruktordeklarationen verarbeitet. Das Issue ist erst abgeschlossen, wenn TypeScript über einen vereinbarten Mechanismus oder Workaround verfügt, der das ungültige bindFramebuffer-Argument und die direkte Konstruktion ablehnt, und das Verhalten durch geeignete Compiler-Tests abgedeckt ist.