fix(core): update

ts/smartnpm.classes.registrycache.ts

@@ -0,0 +1,30 @@
+import { NpmRegistry } from './smartnpm.classes.npmregistry';
+import * as plugins from './smartnpm.plugins';
+
+export class RegistryCache {
+  npmregistryRef: NpmRegistry;
+  public levelCache: plugins.levelcache.LevelCache;
+
+  constructor(npmRegistryRefArg: NpmRegistry) {
+    this.npmregistryRef = npmRegistryRefArg;
+    this.levelCache = new plugins.levelcache.LevelCache({
+      cacheId: encodeURIComponent(this.npmregistryRef.options.npmRegistryUrl),
+      
+    });
+  }
+
+  public async getCachedFile (fileId: string): Promise<plugins.smartfile.Smartfile> {
+    const cacheEntry = await this.levelCache.retrieveCacheEntryByKey(fileId);
+    if (cacheEntry) {
+      return plugins.smartfile.Smartfile.fromFoldedJson(cacheEntry.contents.toString());
+    }
+    return null;
+  }
+
+  public async cacheSmartFile (fileIdArg: string, smartfileArg: plugins.smartfile.Smartfile) {
+    await this.levelCache.storeCacheEntryByKey(fileIdArg, new plugins.levelcache.CacheEntry({
+      contents: Buffer.from(smartfileArg.foldToJson()),
+      ttl: 60000
+    }));
+  }
+}