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Instance member function becomes instance member property in mapped types
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**TypeScript Version:** `4.0.0-dev.20200512`
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- instance member function becomes instance member property
- mixin property of exported class expression may not be private or protected
**Code**
```ts
export class Application {
protected getState() {
return 'starting';
}
component(componentCtor: typeof Object) {
// mount the component
}
}
// Ideally, I'd like to write `function repositoryMixin(superClass: typeof Application)`, but that
// triggers "property of exported class expression may not be private or protected"
export function repositoryMixin<T extends MixinTarget<Application>>(superClass: T) {
return class extends superClass {
component(componentCtor: typeof Object) {
super.component(componentCtor);
// register repositories contributed by the component
}
}
}
// helpers to work around TypeScript limitations related to mixins
export type Constructor<T extends object> = new (...args: any[]) => T;
export type MixinTarget<T extends object> = Constructor<
{
// Enumerate only public members to avoid the following compiler error:
// Property '(some-name)' of…
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