pug realtime render

-demo https://codepen.io/gnjo/pen/mYJzKM?editors=1010
-api https://pugjs.org/api/reference.html

<script src="https://gnjo.github.io/pug/pug.js"></script>

//check 
console.log(window.pug)

 //core
 //default render
 var html=pug.render(str,{pretty:true})

 //debug hint mode
 let caller=(err)=>{console.log(err)} //null is ok
 pug.render(str,{compileDebug:true},caller)