The TypeSpec VS Code extension can be installed from the VS Code marketplace or directly on the command line:

1. Run npm i to install required packages.
2. Run npm run compile to compile the code, check the package.json for compile step info.
3. Compiled code is located at tsp-output/@typespec/openapi3/openapi.yaml
4. Create tspconfig.yaml file for the additional configuration, check the documentation for more info.