Yggdrasil is a Rust project designed to create the core of the Unleash SDK domain logic in a single language (in this case Rust).

Easy enough - run cargo build from the root of the project. You'll need an up to date set of Rust tools to do this.

To run the client specs, you'll first need to clone them:

git clone --depth 5 --branch v4.2.2 https://github.com/Unleash/client-specification.git client-specification

The Node core is a special case, this doesn't use FFI like the other SDKs, instead this compiles the core down to WASM.

You'll need to build the core first, once that's compiled, from the root of the node-sdk project, run wasm-pack build. Once that's built, navigate to {root}/node-sdk/pkg and run npm link, which should make the node package available. Finally, from {root}/node-sdk/www run

npm link node-sdk
npm install
npm start

You can open a browser and head to http://localhost:8080 and inspect the console to see the Unleash engine evaluate a toggle.

The Python core uses PyO3 for its bindings.

Start by setting up and activating a virtual environment in the python-sdk folder:

python3 -m venv venv
source venv/bin/activate

Install maturin by executing pip install maturin in your shell. Then you can run maturin develop.