development environment

We put a Redis server inside our runtime

a month ago

Encore enables running identical backend code across local development, testing, and production environments, with infrastructure declared directly in the code and provisioned per environment.
For local development, Encore's runtime includes an in-memory Redis server built directly into the process, avoiding external dependencies like Docker containers or mocks that might behave differently.
Originally implemented in Go using alicebob/miniredis for Go applications, Encore ported this to Rust to embed within the Rust runtime for TypeScript apps, totaling around 25,000 lines and supporting key Redis data types and protocols.
The embedded server mimics real Redis behavior, including time-based expiry via a mock clock and key pruning to prevent unlimited growth, ensuring local development closely matches production behavior.