with-file-cache

A filesystem-based caching library for JavaScript/TypeScript functions. Current stable version is 3.4.0, with a release cadence of roughly yearly major versions. It persists function results between restarts, supports waiting for in-progress results, works across workers, and allows custom serialization/deserialization. Unlike in-memory caches, it survives process restarts and can be shared among workers. It is ESM-only and ships TypeScript definitions.