firestore.js

// Import only what you need
const admin = require('firebase-admin');

process.env['FIRESTORE_EMULATOR_HOST'] = 'localhost:8081';

var serviceAccount = require('./curso_inicio.json')
admin.initializeApp({
    credential: admin.credential.cert(serviceAccount),
    projectId: "curso-de-inicio",
});

var database = admin.firestore();

(async () => {
    const docRef = database.collection('campo').doc('alovelace122/campo/12');
    await docRef.set({
        first: 'Ada modif11',
        last: 'Lovelace122',
        born: 18152
    });
})()