The frontend tool is in the frontend folder
To test this tool, do the setup dance once
cd frontend
npm install
node_modules/.bin/tsc convert.ts
Then run it and give it a Polymer JS file as the only argument
node convert.js in/grid-columns.js
This will convert in/grid-columns.js into a Lit element and place the output in in/grid-columns.out.js
The Java tool is in the java folder
To test this tool, do the setup dance once
cd java
mvn package
Then run it and give it a PolymerTemplate Java file
mvn exec:exec -Dfile=/my/project/src/main/java/my/package/MyTemplate.java