How to convert ES6 code to ES5 code on Run Time of Angular App

I am getting one angular module details from API. The module is in ES6 i want to convert that module code into ES5 syntax.

API Used for Module Response

i have tried import { transform } from 'babel-core'; after installing the babel run time. but it is throwing error.

load() {
    fetch(url) // making the get request for loading the module response
      .then(response => response.text())
      .then(source => {
// i want to convert this response to es5 standard. right now it is in es6
      });
  }

My expectation is to transpile es6 to es5 code, on run time of angular component function.

Do:

npm install --save-dev @babel/core @babel/preset-env

and then:

import * as babel  from '@babel/core';

load() {
    fetch(url)
      .then(response => response.text())
      .then((source) => {
         return babel.transform(source, {
           presets: ['@babel/preset-env']
         });
      });
  }