npm i

ng generate environments

export const environment = {
  production: false,
  firebase: {
    apiKey: "your-api-key",
    authDomain: "your-auth-domain.firebaseapp.com",
    projectId: "your-project-id",
    storageBucket: "your-storage-bucket.appspot.com",
    messagingSenderId: "your-messaging-sender-id",
    appId: "your-app-id"
  }
};

npm run start