To compile:
npm install
npm run build
For dev, you may want to watch:
Hit ⌘⇧B (Ctrl-Shift-B for Windows) in Visual Studio Code, then select tsc: watch - tsconfig.json. This tells Visual Studio Code to compile code.ts into code.js. It will watch for changes to code.ts and automatically re-generate code.js every time code.ts is saved.
You may need to install Typescript first:
npm install -g typescript
And you may need to install Node first.
Use the Figma desktop app and import the plugin via the plugins menu.
Then you can run the plugin via the plugins menu or the quick actions menu.