AjaxLib.cmp

<aura:component implements="flexipage:availableForAllPageTypes,forceCommunity:availableForAllPageTypes" extensible="true">

	<aura:method name="execApex" action="{! c.execApex }">
		<aura:attribute name="callingComponent" type="Aura.Component" default="{! this }" />
		<aura:attribute name="method" type="String" />
		<aura:attribute name="params" type="Map" />
	</aura:method>


    {! v.body }
	
</aura:component>

AjaxLib.cmp-meta.xml

<?xml version="1.0" encoding="UTF-8"?>
<AuraDefinitionBundle xmlns="http://soap.sforce.com/2006/04/metadata">
    <apiVersion>43.0</apiVersion>
    <description>Library contains methods to work with server side (APEX).</description>
</AuraDefinitionBundle>

AjaxLibController.js

({

	execApex: function(cmd, event, helper) {
		return helper.execApex(event.getParam('arguments'));
	},

})

AjaxLibHelper.js

({

	execApex: function (eventParams) {

		var d = new Date;
		var log = console.log.bind(console, eventParams.callingComponent ? eventParams.callingComponent.getName() : '');

		log(`${d.getHours()}-${d.getMinutes()}-${d.getSeconds()}`, 'start exec');

		return new Promise($A.getCallback((resolve, reject) => {
            log(`${d.getHours()}-${d.getMinutes()}-${d.getSeconds()}`, 'start promise');

			let { callingComponent, method, params } = eventParams;
			let action = callingComponent.get('c.' + method);
			params && action.setParams(params);
			action.setCallback(this, function (response) {
				if ('SUCCESS' !== response.getState()) {
					console.error(response.getState(), response.getError());

                    log(`${d.getHours()}-${d.getMinutes()}-${d.getSeconds()}`, 'reject');
                    reject(response);
					return;
				}

                log(`${d.getHours()}-${d.getMinutes()}-${d.getSeconds()}`, 'resolve');
				resolve(response.getReturnValue());
			});
			$A.enqueueAction(action);

			log(`${d.getHours()}-${d.getMinutes()}-${d.getSeconds()}`, 'enqueueAction');
		}));
	},
	
})

Usage:

<c:AjaxLib aura:id="AjaxLib" />


init : function (component) {
    component.find('AjaxLib').execApex(component, "doAction", { 
                     paramId : component.get("v.recordId"), 
                 }).then(result => { 
                         console.log(result);
                 }).catch(result => {
		console.log(result.message);
                 });
      },