SDKs

Every EvidentSource SDK covers three concerns:

1. Client — a typed gRPC client for issuing commands, reading state views, and subscribing to events.
2. Functions — the scaffolding to write State Change (decide) and State View (evolve) components that compile to WebAssembly.
3. Codegen — types generated from your project’s schemas (see Defining schemas).

Maturity

Language	Client	Functions	Notes
Rust	✅ stable	✅ stable	Reference implementation — most complete
Go	✅ stable	✅ stable	Requires TinyGo 0.40.1+ for WASM
TypeScript	✅ stable	✅ stable	ESM-only; uses jco for WASM
Python	✅ stable	🚧 beta	Uses componentize-py
.NET	✅ stable	✅ stable	.NET 10+; WASM compilation is Windows-only at time of writing

Picking a language

The programming model is identical everywhere — you write decide and evolve as pure functions of typed inputs. Pick the language your team already lives in. Rust has the deepest ergonomics; TypeScript and Python are fastest for exploratory work; Go is the most straightforward for server-side integration.

Getting started

• Connecting a client to the Sandbox: Connecting with an SDK
• Issuing commands: Issuing commands
• Generating code from Designer: Generating code

Source

Each SDK lives under evidentsource/sdks/<language>/ in the monorepo. Each has its own README with language-specific build and test instructions.