Common UI Library for Polestar and Voyager.

To use vega-lite-ui, you need to install its dependencies and build the vlui.js and vlui.min.js scripts. We assume that you have npm installed.

1. Run npm install in the vega-lite-ui repository folder to install the dependencies needed to build vega-lite-ui

• Note: vega-lite-ui uses Bower for client-side dependency management. Bower will automatically run its own installation process once the npm install completes, but if you need to run additional bower commands, the bower command-line utility can be globally installed with npm install -g bower.

2. Run npm run build. This will use Gulp to concatenate the source files together into vlui.js, then use uglify-js to create the minified vlui.min.js.

• Since fieldDef in Vega-Lite is equivalent to encodingQuery in CompassQL but this project predates CompassQL, we use fieldDef to refer to both of them.