refactor(cache): add MapLike interface to loosen Map impls

thi-ng · Oct 31, 2024 · 603c76c · 603c76c
1 parent 8301254
commit 603c76c
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Showing 3 changed files with 16 additions and 5 deletions.
diff --git a/packages/cache/src/api.ts b/packages/cache/src/api.ts
@@ -98,7 +98,7 @@ export interface CacheOpts<K, V> {
 	 * Custom ES6 Map compatible implementation to use as the cache's backing
 	 * store.
 	 */
-	map: Fn0<Map<K, any>>;
+	map: Fn0<MapLike<K, any>>;
 	/**
 	 * Max number of items in the cache.
 	 */
@@ -115,3 +115,14 @@ export interface CacheEntry<K, V> {
 	v: V;
 	s: number;
 }
+
+/**
+ * Simplified subset of the ES6 Map API needed for cache implementations.
+ */
+export interface MapLike<K, V> {
+	has(key: K): boolean;
+	get(key: K): Maybe<V>;
+	set(key: K, val: V): void;
+	delete(key: K): void;
+	clear(): void;
+}
diff --git a/packages/cache/src/lru.ts b/packages/cache/src/lru.ts
@@ -1,10 +1,10 @@
 import type { Fn0, Maybe, Nullable } from "@thi.ng/api";
 import type { ConsCell } from "@thi.ng/dcons";
 import { DCons } from "@thi.ng/dcons/dcons";
-import type { CacheEntry, CacheOpts, ICache } from "./api.js";
+import type { CacheEntry, CacheOpts, ICache, MapLike } from "./api.js";
 
 export class LRUCache<K, V> implements ICache<K, V> {
-	protected map: Map<K, ConsCell<CacheEntry<K, V>>>;
+	protected map: MapLike<K, ConsCell<CacheEntry<K, V>>>;
 	protected items: DCons<CacheEntry<K, V>>;
 	protected opts: CacheOpts<K, V>;
 	protected _size: number;

diff --git a/packages/cache/src/tlru.ts b/packages/cache/src/tlru.ts
@@ -1,6 +1,6 @@
 import type { Fn0, Maybe, Nullable } from "@thi.ng/api";
 import type { ConsCell, DCons } from "@thi.ng/dcons";
-import type { CacheEntry, CacheOpts } from "./api.js";
+import type { CacheEntry, CacheOpts, MapLike } from "./api.js";
 import { LRUCache } from "./lru.js";
 
 export interface TLRUCacheOpts<K, V> extends CacheOpts<K, V> {
@@ -50,7 +50,7 @@ export interface TLRUCacheEntry<K, V> extends CacheEntry<K, V> {
  */
 export class TLRUCache<K, V> extends LRUCache<K, V> {
 	protected declare opts: TLRUCacheOpts<K, V>;
-	protected declare map: Map<K, ConsCell<TLRUCacheEntry<K, V>>>;
+	protected declare map: MapLike<K, ConsCell<TLRUCacheEntry<K, V>>>;
 	protected declare items: DCons<TLRUCacheEntry<K, V>>;
 
 	constructor(