Let's assume you have class decorator defined as follows:
const foo: ClassDecorator = (target) => {
return class FooBar extends (target as any as Constructor<any>) {
someProperty = true;
}
};
@foo
class Bar {}
(new Bar).someProperty; // TS2339: Property 'someProperty' does not exist on type 'Bar'.Well, ClassDecorator is defined by TypeScript as:
declare type ClassDecorator = <TFunction extends Function>(target: TFunction) => TFunction | void;ClassDecorator for mixins should probably look like:
declare type Mixin<TFunction extends Constructor<InstanceType>, InstanceType=any, MixedInstance={}, MixedStatic={}> = Constructor<InstanceType & MixedInstance> & MixedStaticHaving MethodDecorator and PropertyDecorator with explicit typing would be nice too, but writing them seems to be really complicated and likely to run in edge cases.
sindresorhus / type-fest
A collection of essential TypeScript types
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