However, require() is not required because programs naturally load all the if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'sebhastian_com-large-mobile-banner-2','ezslot_5',136,'0','0'])};__ez_fad_position('div-gpt-ad-sebhastian_com-large-mobile-banner-2-0'); Sometimes, JavaScript may suddenly give you a require is not defined error when importing a module as follows:if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'sebhastian_com-medrectangle-3','ezslot_14',170,'0','0'])};__ez_fad_position('div-gpt-ad-sebhastian_com-medrectangle-3-0'); This usually happens because your JavaScript environment doesnt understand how to handle the call to require() function you defined in your code. At the time of using jQuery in pHtml file, you might have faced an error like Uncaught reference error requireJS is not defined in Magento 2. The function hello() is already loaded just like that. @Alessandro77, could you provide a content of requirejs-config.js file, or even a few lines of code around 356 line. After a