Definition of a generator in Typescript using an interface

I am in the process of converting some code to TypeScript which currently looks like this:

const saga =  function* (action) {
        yield put({
            type: actions.SUCCESS,
            payload: action.payload
        });
    };


const sagaWatcher =  createDefaultSagaWatcher(actions, saga); 

To add type checking on the createDefaultSagaWatcher function, I need to create an interface for the generator function. How can I achieve this?

I attempted creating an interface like this:

interface ReduxSaga {
    (action: ReduxAction)* : any; 
}

However, the syntax used in the interface is incorrect.

Answer №1

In a similar way to how the async keyword functions, the * symbol serves as an internal technicality. What is crucial for the function's user is that it produces an iterable result, while the specific mechanics of that iteration process are irrelevant. If the goal is for the iteration to yield any type of value, the IterableIterator<any> can be utilized.

interface ReduxSaga {
    (action: ReduxAction): IterableIterator<any>; 
} 

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