This is a quick and dirty example of how you can use @converse/headless.
While working on this example I've made changes to @converse/headless that are not yet released. You'll therefore need a source checkout of converse.js available.
git clone git@github.com:conversejs/converse.js.git
cd converse.js/src/headless
npm link
Now that you've created a link for @converse/headless, you can link it in your checkout of this repo:
git clone git@github.com:conversejs/headless-example.git
cd headless-example
npm link @converse/headless
You can run make watchjs to build the distribution file.
Then run make serve and open https://localhost:7080 in your browser.