function monitorUpload()

in storage/upload-files.js [117:154]

• 28 lines of code
• 3 McCabe index (conditional complexity)

function monitorUpload(file) {
  const storageRef = firebase.storage().ref();

  // [START storage_monitor_upload]
  var uploadTask = storageRef.child('images/rivers.jpg').put(file);

  // Register three observers:
  // 1. 'state_changed' observer, called any time the state changes
  // 2. Error observer, called on failure
  // 3. Completion observer, called on successful completion
  uploadTask.on('state_changed', 
    (snapshot) => {
      // Observe state change events such as progress, pause, and resume
      // Get task progress, including the number of bytes uploaded and the total number of bytes to be uploaded
      var progress = (snapshot.bytesTransferred / snapshot.totalBytes) * 100;
      console.log('Upload is ' + progress + '% done');
      switch (snapshot.state) {
        case firebase.storage.TaskState.PAUSED: // or 'paused'
          console.log('Upload is paused');
          break;
        case firebase.storage.TaskState.RUNNING: // or 'running'
          console.log('Upload is running');
          break;
      }
    }, 
    (error) => {
      // Handle unsuccessful uploads
    }, 
    () => {
      // Handle successful uploads on complete
      // For instance, get the download URL: https://firebasestorage.googleapis.com/...
      uploadTask.snapshot.ref.getDownloadURL().then((downloadURL) => {
        console.log('File available at', downloadURL);
      });
    }
  );
  // [END storage_monitor_upload]
}