SampleAuraHelper.js Lightning Component

SampleAuraHelper.js

({
  /**
   * Call Apex Server-Side method in Promise
   */
  sendRequest : function(cmp, methodName, params){
    return new Promise($A.getCallback(function(resolve, reject) {
      var action = cmp.get(methodName);
      action.setParams(params);
      action.setCallback(self, function(res) {
        var state = res.getState();
        if(state === 'SUCCESS') {
          resolve(res.getReturnValue());
        } else if(state === 'ERROR') {
          reject(action.getError())
        }
      });
      $A.enqueueAction(action);
    }));
  }

})