feature/cache: Add lru-cache wrapper

Author: Intellicode

src/lru-cache.js

@@ -0,0 +1,25 @@
+const lru = require('lru-cache');
+
+module.exports = class LRU {
+  constructor({ maxItems }) {
+    this.cache = lru(maxItems);
+  }
+
+  get(key) {
+    return Promise.resolve(this.cache.get(key));
+  }
+
+  set(key, value, options) {
+    const { maxAge } = options || {};
+    this.cache.set(key, value, maxAge);
+    return Promise.resolve(key);
+  }
+
+  values() {
+    return Promise.resolve(this.cache.values());
+  }
+
+  length() {
+    return this.cache.length;
+  }
+};