How to Utilize an Interface in a Type Definition File That is Not Publicly Exported (Storing Interface in @types/cache-manager)

The Definition file for @types/cache-manager includes the following definition:

interface Cache {
    del(key: string): Promise<any>;   
    // 11 other Method Signitures (removed for brevity)
}

Additionally, it contains:

declare namespace cacheManager {
    function caching(IConfig: StoreConfig): Cache;
    function multiCaching(Caches: Cache[]): Cache;
}

export = cacheManager;

I am interested in utilizing the Cache interface in my own code. However, because it is not being exported, I am unable to access it. This has led me to ponder the following questions:

  • Could there be a valid reason why the author chose not to export the Cache interface?
  • Is there any possible method by which I could forcefully export this interface?
typescripttypescript-typings

Answer №1

For the first question, I personally disagree, but everyone is entitled to their own opinion.

Regarding the second question, there isn't a straightforward way to access an unexported definition. However, by leveraging the return type of exported functions like Cache, you can retrieve it. Here's an example:

import * as CacheManager from "cache-manager";
type Cache = ReturnType<typeof CacheManager.caching>;

If you prefer another approach, you could consider cloning the @types/cache-manager package using a tool like Braid (full disclosure: I am a Braid contributor). After adding it as a relative-path dependency in your package.json, feel free to modify it as needed.

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