feat: add support for nip44

extension/utils.js

@@ -0,0 +1,38 @@
+export class LRUCache {
+  constructor(maxSize) {
+    this.maxSize = maxSize;
+    this.map = new Map();
+    this.keys = [];
+  }
+
+  clear() {
+    this.map.clear();
+  }
+
+  has(k) {
+    return this.map.has(k);
+  }
+
+  get(k) {
+    const v = this.map.get(k);
+
+    if (v !== undefined) {
+      this.keys.push(k);
+
+      if (this.keys.length > this.maxSize * 2) {
+        this.keys.splice(-this.maxSize);
+      }
+    }
+
+    return v;
+  }
+
+  set(k, v) {
+    this.map.set(k, v);
+    this.keys.push(k);
+
+    if (this.map.size > this.maxSize) {
+      this.map.delete(this.keys.shift());
+    }
+  }
+}