file-cache

File-based cache for JSON-serializable data.

Install

Requires at least Node.js v14.14.0.

npm install @uwdata/file-cache

Usage

@uwdata/file-cache is an ESM-only module - you are not able to import it with require().

Standard Usage

import { fileCache, deleteCache } from '@uwdata/file-cache';

// create a new cache, writes to '.cache' in current working dir
// the cache directory will be created if it does not exist
const cache = await fileCache();

// set cache value writes both to in-memory map and to disk
await cache.set('key', { value: true });

// get cache value reads from disk if not found in-memory
const value = await cache.get('key');
// value = { value: true}

// delete cache value from both in-memory map and disk
await cache.delete('key');

// delete cache values and folder from disk
// subsequent use of existing cache instance is ill-advised
await deleteCache();

Custom Usage

import { fileCache, deleteCache } from '@uwdata/file-cache';

// create a new cache with custom directory and time-to-live
const cache = await fileCache({
  cacheDir: '.my-cache-dir', // custom cache directory
  defaultTTL: 60 * 1000, // default time-to-live before expiration (ms)
});

// set cache value along with a custom TTL value for the entry
await cache.set('key', { value: true }, 120 * 1000);

// delete cache values and folder from disk
// subsequent use of existing cache instance is ill-advised
await deleteCache('.my-cache-dir');