How to trigger Firestore ?

In this story we will cover trigger on firestore .We will use JavaScript for trigger firestore.

const functions = require('firebase-functions');

const admin = require('firebase-admin');
admin.initializeApp();
const db = admin.firestore();

exports.getData = functions.https.onRequest((req, res) => {
 const docRef = db.collection('collectionName).doc('document')
 const getDoc = docRef.getData()
   .then(doc => {
     if (!doc.exists) {
       console.log('No such document!');
       return res.send('Not Found')
     }
       console.log(doc.data());
//        res.status(200).json(doc.data())
       return res.send(doc.data());

   })
   .catch(err => {
     console.log('Error getting document', err);
   });
});
exports.storageChanges = functions.storage.object().onArchive(event => {
 return res.send(event.getData());
});

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