npm run build doesn't build the files correctly

[dgobnto]

How can this bug be reproduced?

1. Build files for production with npm run build

What did you expect to happen?

Built files to work normally

What happened instead?

One of the js files throws a "ReferenceError: a is not defined". npm run dev builds the files correctly.

init-works.js

import $ from 'jquery';
import Cookies from 'js-cookie';

var loading = $('.work-loading');
function init_works() {
    loading.fadeToggle(400, 'linear');
    if (!Cookies.get('works-view') || 'list' === Cookies.get('works-view')) {
        $('.work-content').removeClass('works-view-grid').addClass('works-view-list');
        $('.work-thumbnail').addClass('dropdown-pane').removeAttr('style');
        Foundation.reInit('dropdown');
    } else if ('grid' === Cookies.get('works-view')) {
        $('.work-thumbnail').foundation('_destroy');
        $('.work-thumbnail').removeClass('dropdown-pane');
        $('.work-content').removeClass('works-view-list').addClass('works-view-grid');
    }
}

$(document).ready(function() {
    init_works();
});

$('#works-view-switch').click(function() {
    loading.toggle();
    if (!Cookies.get('works-view') || 'list' === Cookies.get('works-view')) {
        Cookies.set('works-view', 'grid');
    } else if ('grid' === Cookies.get('works-view')){
        Cookies.set('works-view', 'list');
    }
    init_works();
});

Please List the Following:

• OS & version: mac os 10.10.5
• Node version (node -v) [Node v6+ is required] : 10.15.0
• FoundationPress version (see line 3 in package.json): 2.10.6
• Foundation version (found in node_modules/foundation-sites/package.json) : 6.5.1