@remcostoeten/fync/dist/src/core/cache/lru.js

A unified TypeScript library for easy access to popular APIs (GitHub, Spotify, GitLab, etc.)

export function createLruCache(options = {}) {
    const cache = new Map();
    const { ttl: defaultTTL, maxSize = 100 } = options;
    function isExpired(entry) {
        if (!entry.expiry)
            return false;
        return Date.now() > entry.expiry;
    }
    function evictExpired() {
        const now = Date.now();
        for (const [key, entry] of cache.entries()) {
            if (entry.expiry && now > entry.expiry) {
                cache.delete(key);
            }
        }
    }
    function evictLru() {
        if (cache.size <= maxSize)
            return;
        const oldestKey = cache.keys().next().value;
        if (oldestKey) {
            cache.delete(oldestKey);
        }
    }
    function get(key) {
        const entry = cache.get(key);
        if (!entry || isExpired(entry)) {
            cache.delete(key);
            return undefined;
        }
        cache.delete(key);
        cache.set(key, entry);
        return entry.value;
    }
    function set(key, value, ttl) {
        evictExpired();
        const effectiveTTL = ttl ?? defaultTTL;
        const entry = {
            value,
            timestamp: Date.now(),
            expiry: effectiveTTL ? Date.now() + effectiveTTL : undefined,
        };
        cache.set(key, entry);
        evictLru();
    }
    function deleteKey(key) {
        return cache.delete(key);
    }
    function clear() {
        cache.clear();
    }
    function has(key) {
        const entry = cache.get(key);
        if (!entry || isExpired(entry)) {
            cache.delete(key);
            return false;
        }
        return true;
    }
    function size() {
        evictExpired();
        return cache.size;
    }
    return {
        get,
        set,
        delete: deleteKey,
        clear,
        has,
        size,
    };
}
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