Firebase App named '[DEFAULT]' already exists (app/duplicate-app) [duplicate]

Answer 1

// config.js

let config = {
     apiKey: "***********",
    authDomain: "***********",
    databaseURL: "***********",
    projectId: "***********",
    storageBucket: "***********",
    messagingSenderId: "***********",
    appId: "",
    measurementId: "***********"
}

export default config;


// home.js 
import config from '../utils/config'; // import my config file
let db;
setTimeout(() => {
    if (!firebase.apps.length) {
        try {
            firebase.initializeApp(config)
        } catch (err) {
            console.log(err)
        }
    }
    db = firebase.firestore();
}, 1000)