Inference for Object.isPrototypeOf()

Hi, I am wondering would be possible to infer types for isPrototypeOf() function same way as it's done with instanceof operator? So we could narrow type of argument if it's been created using Object.create(proto) function and its type would be something like typeof proto if check is fulfilled.

Search Terms

isPrototypeOf

Examples

if (object instanceof HTMLAnchorElement) {
    console.log(object.href);
}

if (HTMLAnchorElement.prototype.isPrototypeOf(object)) {
   console.log(object.href);
}

Checklist

My suggestion meets these guidelines:

• This wouldn't be a breaking change in existing TypeScript/JavaScript code
• This wouldn't change the runtime behavior of existing JavaScript code
• This could be implemented without emitting different JS based on the types of the expressions
• This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, etc.)
• This feature would agree with the rest of TypeScript's Design Goals.

En el issue no se identifica ningún archivo de implementación, prueba ni punto de entrada. Empieza localizando el estrechamiento de tipos existente para instanceof y, después, evalúa cómo deberían estrecharse los objetos creados con Object.create(proto) en los ejemplos de Object.isPrototypeOf(); se considera terminado cuando el comportamiento propuesto está especificado y cubierto por pruebas de compilador adecuadas.