Automatically check billing address same as shipping in Magento 2

billing-address-mixin.js

define([
  'jquery',
  'Magento_Checkout/js/checkout-data',
  'Magento_Checkout/js/model/quote'
],function ($, checkoutData, quote) {
  'use strict';

  return function (Component) {
    return Component.extend({

      initObservable: function () {
        this._super()
          .observe({
            isAddressSameAsShipping: !(quote.billingAddress() === undefined || checkoutData.getSelectedBillingAddress() === 'new-customer-address')
          });

        return this;
      }
    });
  };
});

requirejs-config.js

var config = {
    config: {
        mixins: {
            'Magento_Checkout/js/view/billing-address': {
                'Magento_Checkout/js/view/billing-address-mixin': true
            }
        }
    }
};