Is it possible to create a higher order function (HOF) that modifies or adds a property to the prototype of a given class?
interface IStore {
new (): {};
}
interface IWatchable {
new() : {
watch: boolean;
};
}
const Store = <T extends IStore>(clazz: T): T & IWatchable => {
return class extends clazz {
watch = true;
};
};
class X extends Store(class {})
// ^^^^^^^^^^^^^^
// All base constructors must have the same return type.
To utilize mixins, follow this pattern that has been proven to work (referencing this PR):
interface IStore {
new(...a: any[]): {};
}
const Store = <T extends IStore>(clazz: T) => {
return class extends clazz {
watch = true;
};
};
class X extends Store(class { }) { }
This approach will provide you with the desired outcome. You can define the IWatchable interface, and even if the result of the Store function does not explicitly implement the interface, mixin classes will still be compatible with it thanks to structural typing.
interface IWatchable {
new(): {
watch: boolean;
};
}
let w : IWatchable = X //ok
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