gistfile1.txt

 #downloadJSPdf() {                                                                             
    const loadJspdf = (() => {                                                                   
      async function actuallyLoad() {                                                            
        const script = document.createElement('script');                                         
        script.src = 'https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.5.1/jspdf.umd.min.js';      
                                                                                                 
        await new Promise((resolve, reject) => {                                                 
          script.addEventListener('error', reject);                                              
          script.addEventListener('load', resolve);                                              
          document.head.appendChild(script);                                                     
        });                                                                                      
      }                                                                                          
                                                                                                 
      let loadingPromise;                                                                        
                                                                                                 
      return async () => {                                                                       
        if (loadingPromise === undefined) {                                                      
          loadingPromise = actuallyLoad();                                                       
        }                                                                                        
        return loadingPromise;                                                                   
      };                                                                                         
    })();                                                                                        
  }