Require Node.js 18

Fixes #46

.github/workflows/main.yml

@@ -10,11 +10,11 @@ jobs:
       fail-fast: false
       matrix:
         node-version:
-          - 14
-          - 12
+          - 20
+          - 18
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-node@v1
+      - uses: actions/checkout@v3
+      - uses: actions/setup-node@v3
         with:
           node-version: ${{ matrix.node-version }}
       - run: npm install

.gitignore

@@ -1,3 +1,4 @@
 node_modules
 yarn.lock
 .nyc_output
+coverage

index.d.ts

@@ -1,4 +1,4 @@
-export interface Options<KeyType, ValueType> {
+export type Options<KeyType, ValueType> = {
 	/**
 	The maximum number of milliseconds an item should remain in the cache.
 
@@ -22,14 +22,10 @@ export interface Options<KeyType, ValueType> {
 	Useful for side effects or for items like object URLs that need explicit cleanup (`revokeObjectURL`).
 	*/
 	onEviction?: (key: KeyType, value: ValueType) => void;
-}
-
-export default class QuickLRU<KeyType, ValueType> extends Map implements Iterable<[KeyType, ValueType]> {
-	/**
-	The stored item count.
-	*/
-	readonly size: number;
+};
 
+// eslint-disable-next-line @typescript-eslint/naming-convention
+export default class QuickLRU<KeyType, ValueType> extends Map<KeyType, ValueType> implements Iterable<[KeyType, ValueType]> {
 	/**
 	Simple ["Least Recently Used" (LRU) cache](https://en.m.wikipedia.org/wiki/Cache_replacement_policies#Least_Recently_Used_.28LRU.29).
 
@@ -101,6 +97,11 @@ export default class QuickLRU<KeyType, ValueType> extends Map implements Iterabl
 	*/
 	resize(maxSize: number): void;
 
+	/**
+	The stored item count.
+	*/
+	get size(): number;
+
 	/**
 	Iterable for all the keys.
 	*/