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.

Nell’issue non sono identificati alcun file di implementazione, test o punto di ingresso. Inizia individuando il restringimento di tipo esistente per instanceof, quindi valuta come dovrebbero essere ristretti gli oggetti creati con Object.create(proto) negli esempi di Object.isPrototypeOf(); il lavoro è completo quando il comportamento proposto è specificato e coperto da test appropriati del compilatore.