add types from ajayyyy/lru-diskcache

- added existing types
- disbled no-unused-vars since there is no other way

src/utils/diskCache.ts

@@ -8,6 +8,7 @@ if (config.diskCache) {
     DiskCache.init();
 } else {
     DiskCache = {
+        /* eslint-disable @typescript-eslint/no-unused-vars */
         // constructor(rootPath, options): {};
 
         init(): void { return; },
@@ -16,16 +17,17 @@ if (config.diskCache) {
 
         has(key: string): boolean { return false; },
 
-        get(key: string, opts): string { return null; },
+        get(key: string, opts?: {encoding?: string}): string { return null; },
 
         // Returns size
-        set(key: string, dataOrSteam): Promise<number> { return new Promise(() => 0); },
+        set(key: string, dataOrSteam: string): Promise<number> { return new Promise(() => 0); },
 
         del(key: string): void { return; },
 
         size(): number { return 0; },
 
         prune(): void {return; },
+        /* eslint-enable @typescript-eslint/no-unused-vars */
     };
 }