Disable AMD when requiring a file.

example.js

const safeRequire = require('./safe-require');
const umdStyleMod = safeRequire('umd-style-mod', () => require('umd-style-mod'));

safe-require.js

'use strict';

/* global define */

const cache = {};

module.exports = function (name, req) {
    if (cache.hasOwnProperty(name)) {
        return cache[name];
    }

    if (typeof define === 'function' && define.amd) {
        const temp = define.amd;
        define.amd = false;
        cache[name] = req();
        define.amd = temp;
    } else {
        cache[name] = req();
    }

    return cache[name];
};