问题
Please help me fix this compilation error.
Below you can see the compiler complaining that the Actions object on line 20 (I removed a few lines for clarity before posting this) is {}:
But below you can see in actions.ts that Actions is an object of type Actions, and it has the requested property (which is a function):
And in the base code you can see in the DefinitelyTyped Alt definition that createActions should return an object of type Actions:
So why is Typescript complaining that Actions is not of type Actions?
回答1:
You're using a module called "app/actions/actions". That module is actually not a module (a map of properties), but whatever's the result of flux.createACtions(Actions):
export = flux.createActions(Actions); // in actions.ts
What does that return? Because you're not specifying the generic for <T>, and because the params of createActions don't correctly include a T from which it could infer, it assumes that T is just {}. This was discussed here and ultimately declined. So, as mentioned, you need to specify the generic:
export = flux.createActions<Actions>(Actions);
But to avoid this, you could change your local (or remote) alt.d.ts to be something like:
class Alt {
createActions<T extends ActionsClass>(con: ActionsClassConstructor<T>, ...): T;
}
type ActionsClassConstructor<T extends ActionsClass> = new (alt:Alt) => T;
This adds the generic type info needed to correctly infer based on the constructor you supply.
来源：https://stackoverflow.com/questions/34179728/ts2339-property-does-not-exist-on-type