global: snapshot

website/scripts/utils/cache.js

@@ -0,0 +1,32 @@
+/**
+ * @template V
+ * @param {number} [maxSize]
+ */
+export function createMapCache(maxSize = 100) {
+  /** @type {Map<string, V>} */
+  const map = new Map();
+
+  return {
+    /** @param {string} key @returns {V | undefined} */
+    get(key) {
+      return map.get(key);
+    },
+    /** @param {string} key @returns {boolean} */
+    has(key) {
+      return map.has(key);
+    },
+    /** @param {string} key @param {V} value */
+    set(key, value) {
+      if (map.size >= maxSize && !map.has(key)) {
+        const first = map.keys().next().value;
+        if (first !== undefined) map.delete(first);
+      }
+      map.set(key, value);
+    },
+  };
+}
+
+/**
+ * @template V
+ * @typedef {{ get: (key: string) => V | undefined, has: (key: string) => boolean, set: (key: string, value: V) => void }} MapCache
+ */