I need help with Template7 with registerHelper

I can’t use Template7.registerHelper with Framework7 v4 Core with webpack!

app.js file

import Framework7, { Template7 } from "framework7/framework7.esm.bundle.js";

Template7.registerHelper('callHelper', function() {
 return 'Mensaje!';

const app = new Framework7({ options });


module.exports = ['callHelper'];

my component file (index.f7.html)

        <div class="page">
        <div class="page-context">
        <div class="block-title">{{ callHelper }}</div>

But i can’t see “Mensaje!”.

Please help me

Пробел слева уберите

Helpers are functions and functions assume you will pass arguments there:

Template7.registerHelper('callHelper', function(name) {
  return `Hello ${name}!`;

And it must be called like: {{callHelper "John"}}

My mystake!.. Thanks!