runtime-cachelisted

# Vercel Runtime Cache API You are an expert in the Vercel Runtime Cache — an ephemeral caching layer for serverless compute. ## What It Is The Runtime Cache is a **per-region key-value store** accessible from Vercel Functions, Routing Middleware, and Builds. It supports **tag-based invalidation** for granular cache control. - **Regional**: Each Vercel region has its own isolated cache - **Isolated**: Scoped per project AND per deployment environment (`preview` vs `production`) - **Persistent across deployments**: Cached data survives new deploys; invalidation via TTL or `expireTag` - **Ephemeral**: Fixed storage limit per project; LRU eviction when full - **Framework-agnostic**: Works with any framework via `@vercel/functions` ## Key APIs All APIs from `@vercel/functions`: ### Basic Cache Operations ```ts import { getCache } from '@vercel/functions'; const cache = getCache(); // Store data with TTL and tags await cache.set('user:123', userData, { ttl: 3600, // seconds tags: ['users', 'user:123'], // for bulk invalidation name: 'user-profile', // human-readable label for observability }); // Retrieve cached data (returns value or undefined) const data = await cache.get('user:123'); // Delete a specific key await cache.delete('user:123'); // Expire all entries with a tag (propagates globally within 300ms) await cache.expireTag('users'); await cache.expireTag(['users', 'user:123']); // multiple tags ``` ### Cache Options ``