ES2016 File Upload With Progress

upload.js

  sendFile(fileInput) {
      let percentCompleted = 0;
      let endpoint = '/store/uploads/here';
    
      const config = {
          'Content-Type': 'multipart/form-data',
          onUploadProgress: function(progressEvent) {
              percentCompleted = Math.round((progressEvent.loaded * 100) / progressEvent.total);
              console.log(percentCompleted);
          }
      };

      let data = new FormData();
      data.append('file', fileInput.files[0);

      axios.post(endpoint, data, config)
           .then(response => console.log(response))
           .catch(error => console.log(error));
  }