lib/runtime.js
function (fn) {
  return subscribe.call(this, fn, function (value) {
    return VM.createComment(value);
  }, function (value) {
    this.value.textContent = value;
  }).value;
}
function (fn) {
  return subscribe.call(this, fn, function (value) {
    return VM.createComment(value);
  }, function (value) {
    this.value.textContent = value;
  }).value;
}
function ( fn ) { return subscribe . call ( this , fn , function ( value ) { return VM . createComment ( value ) ; } , function ( value ) { this . value . textContent = value ; } ) . value ; }
Create a comment node and subscribe to any changes.

@param  {Function} fn
@return {Comment}
Create a comment node and subscribe to any changes .