shim/node/engine.js
function registerHelper(name, helper) {
    var s = this;
    s.helpers = s.helpers || {};
    s.helpers[name] = helper;
    return s;
  }
function registerHelper(name, helper) {
    var s = this;
    s.helpers = s.helpers || {};
    s.helpers[name] = helper;
    return s;
  }
function registerHelper ( name , helper ) { var s = this ; s . helpers = s . helpers || { } ; s . helpers [ name ] = helper ; return s ; }
Register a helper.
@param {string} name - Name of the helper.
@param {function} helper - Helper function.
@returns {HandlebarsEngine} - Returns self.
Register a helper .