make async equality collections sync iterables

src/equality-map.ts

@@ -1,5 +1,4 @@
 import { Equater, MaybeAsyncEquater } from "./types.js";
-import { asAsyncGenerator } from "./utils.js";
 
 export interface EqualityMap<K, V> extends Iterable<[K, V]> {
   readonly size: number;
@@ -149,12 +148,12 @@ export function createEqualityMap<K, V>(keyComparer?: Equater<K>): EqualityMap<K
   return keyComparer ? new CustomEqualityMap<K, V>(keyComparer) : new NativeEqualityMap<K, V>();
 }
 
-export interface AsyncEqualityMap<K, V> extends AsyncIterable<[K, V]> {
+export interface AsyncEqualityMap<K, V> extends Iterable<[K, V]> {
   get(key: K): Promise<V | undefined>;
   set(key: K, value: V): Promise<V | undefined>;
   contains(key: K): Promise<boolean>;
   remove(key: K): Promise<V | undefined>;
-  clear(): Promise<void>;
+  clear(): void;
 }
 
 class NativeAsyncEqualityMap<K, V> implements AsyncEqualityMap<K, V> {
@@ -180,12 +179,12 @@ class NativeAsyncEqualityMap<K, V> implements AsyncEqualityMap<K, V> {
     return existing;
   }
 
-  async clear() {
+  clear() {
     this.#map.clear();
   }
 
-  [Symbol.asyncIterator]() {
-    return asAsyncGenerator(this.#map[Symbol.iterator]());
+  [Symbol.iterator]() {
+    return this.#map[Symbol.iterator]();
   }
 }
 
@@ -242,12 +241,14 @@ class CustomAsyncEqualityMap<K, V> implements AsyncEqualityMap<K, V> {
     return undefined;
   }
 
-  async clear() {
+  clear() {
     this.#list.length = 0;
   }
 
-  [Symbol.asyncIterator]() {
-    return asAsyncGenerator(this.#list[Symbol.iterator]());
+  *[Symbol.iterator]() {
+    for (const entry of this.#list) {
+      yield [entry[0], entry[1]] as [K, V]; // no entry mutation allowed!
+    }
   }
 }