JSX: a way to make all the properties of value-based elements optional

It's not documented, but currently, if the JSX.ElementAttributesProperty interface is declared empty,

declare namespace JSX { interface ElementAttributesProperty {} }

then the element attributes type becomes same as the element instance type. However, if the element instance type is a class, this leads to a situation where the compiler requires that all the members of the class be represented as attributes since they're not optional (and even cannot be marked as such as the class syntax doesn't allow optional members).

class MyComponent {
  myProp: string;
  private myMethod(): void;
}
var a = <MyComponent myProp='value'/>;
// error: Property 'myMethod' is missing in type MyComponent

This prevents me from using JSX for type-checking Angular 1 templates (you can find my experiments in this area here).

What if we introduce some way to tell the compiler that not all the properties are required, but only some of them? E.g. those having a certain decorator?

A related issue: #5151

L’issue n’indique aucun fichier, test ou point d’entrée du compilateur. Commencez par localiser la gestion de JSX ElementAttributesProperty et l’issue associée #5151, puis examinez les tests existants de vérification de types JSX ; la finalisation nécessiterait un mécanisme convenu permettant de rendre optionnelles certaines propriétés d’éléments basées sur les valeurs, ainsi que des tests couvrant l’exemple de class.