forked from hero/www_hero
98 lines
2.0 KiB
TypeScript
98 lines
2.0 KiB
TypeScript
declare namespace QuickLRU {
|
|
interface Options<KeyType, ValueType> {
|
|
/**
|
|
The maximum number of items before evicting the least recently used items.
|
|
*/
|
|
readonly maxSize: number;
|
|
|
|
/**
|
|
Called right before an item is evicted from the cache.
|
|
|
|
Useful for side effects or for items like object URLs that need explicit cleanup (`revokeObjectURL`).
|
|
*/
|
|
onEviction?: (key: KeyType, value: ValueType) => void;
|
|
}
|
|
}
|
|
|
|
declare class QuickLRU<KeyType, ValueType>
|
|
implements Iterable<[KeyType, ValueType]> {
|
|
/**
|
|
The stored item count.
|
|
*/
|
|
readonly size: number;
|
|
|
|
/**
|
|
Simple ["Least Recently Used" (LRU) cache](https://en.m.wikipedia.org/wiki/Cache_replacement_policies#Least_Recently_Used_.28LRU.29).
|
|
|
|
The instance is [`iterable`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Iteration_protocols) so you can use it directly in a [`for…of`](https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Statements/for...of) loop.
|
|
|
|
@example
|
|
```
|
|
import QuickLRU = require('quick-lru');
|
|
|
|
const lru = new QuickLRU({maxSize: 1000});
|
|
|
|
lru.set('🦄', '🌈');
|
|
|
|
lru.has('🦄');
|
|
//=> true
|
|
|
|
lru.get('🦄');
|
|
//=> '🌈'
|
|
```
|
|
*/
|
|
constructor(options: QuickLRU.Options<KeyType, ValueType>);
|
|
|
|
[Symbol.iterator](): IterableIterator<[KeyType, ValueType]>;
|
|
|
|
/**
|
|
Set an item.
|
|
|
|
@returns The list instance.
|
|
*/
|
|
set(key: KeyType, value: ValueType): this;
|
|
|
|
/**
|
|
Get an item.
|
|
|
|
@returns The stored item or `undefined`.
|
|
*/
|
|
get(key: KeyType): ValueType | undefined;
|
|
|
|
/**
|
|
Check if an item exists.
|
|
*/
|
|
has(key: KeyType): boolean;
|
|
|
|
/**
|
|
Get an item without marking it as recently used.
|
|
|
|
@returns The stored item or `undefined`.
|
|
*/
|
|
peek(key: KeyType): ValueType | undefined;
|
|
|
|
/**
|
|
Delete an item.
|
|
|
|
@returns `true` if the item is removed or `false` if the item doesn't exist.
|
|
*/
|
|
delete(key: KeyType): boolean;
|
|
|
|
/**
|
|
Delete all items.
|
|
*/
|
|
clear(): void;
|
|
|
|
/**
|
|
Iterable for all the keys.
|
|
*/
|
|
keys(): IterableIterator<KeyType>;
|
|
|
|
/**
|
|
Iterable for all the values.
|
|
*/
|
|
values(): IterableIterator<ValueType>;
|
|
}
|
|
|
|
export = QuickLRU;
|