block10.ts

// For this example, we use `any` a lot. We will fully type this soon
    // This code is a little dense, but serves as a good abstraction
    function makeAction(type: string) {
      return (fn: (...args: any[]) => any) => { 
        const returnFn = (...args: any[]) => ({ ...fn(...args), type })
        (returnFn as any).__actionType = type;
        return returnFn;
      };
    }
    
    // Usage:
    const addToCart = makeAction('ADD_TO_CART')((productIds: string[]) => ({
      payload: {
        productIds: productIds,
        timeAdded: new Date(),
      },
    }));
    
    // Dispatch:
    myStore.dispatch(addToCart(['ABC123', 'DEFG56']));