Struggling with typing functions that return functions

I am relatively new to TypeScript and I have a function that returns an object with two functions. Even though I have defined a return interface for it, I encounter an issue when trying to use one of the returned functions.

TS2339: Property 'get' does not exist on type '() => { get: (url: string) => string | null; set: ({ url, body }: SetItemInterface) => void; }'.

Here's the code snippet:

import * as Express from "express";

interface StorageInterface {
  [url: string]: {
    body: string;
    date: number;
  };
}

// And so on...

What could be the solution?

Answer №1

Storage behaves like a storage unit:

const Storage = (): StorageInterface => { ...

and you interact with it as an object by attempting to invoke the .retrieve method on it.

Storage.retrieve(...

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