const fruitRef = db.collection('fruits').doc('fruit_document'); 
// Remove the 'apple' field from the document 
const removeFruit = fruitRef.update({ apple: firebase.firestore.FieldValue.delete() }); 

import * as admin from 'firebase-admin';

// Create a document reference 
const fruitRef = db.collection('fruits').doc('fruit_document'); 
// Remove the 'fruit' field from the document 
const removeFruit = fruitRef.update({ apple: fieldValue.delete() }); 

import * as admin from 'firebase-admin`; 
const fieldValue = admin.firestore.FieldValue; 
// Create a document reference
const fruitRef = db.collection('fruits').doc('fruit_document');
// Remove the 'fruit' field from the document 
const removeFruit = fruitRef.update({ apple: fieldValue.delete() });