Source https://jsbin.com/daromoquha/1/edit?js,output

component.js

void function(m) {
  
  function closure(fn) {
      var component = {
          controller : function(options) {
              component.view = fn(options);
          }
      };

      return component;
  }

  m.mount(document.body, closure(function() {
      var count = 1;

      function increment() {
          count++;
      }

      return function() {
          return m("div",
              count,
              m("button",
                  { onclick : increment },
                  "increment"
               )
          );
      }
  }));
  
  
}(m)