Activate offline storage for Cloud Firestore

Question

Activate offline storage for Cloud Firestore

I am seeking to implement offline persistence using the Cloud Firestore Javascript SDK in my app. My architecture involves storing firestore as a property for Server-Side Rendering (SSR).

import firebase from "firebase/app";

export class GetFirebase {
private firestore: firebase.firestore.Firestore;
private firebaseApp: firebase.app.App;
private firebaseConfig = {} // contains Firebase configuration

 private constructor() {
  this.firebaseApp = firebase.initializeApp(this.firebaseConfig);
  this.firestore = firebase.firestore();
 }
}

When I try to utilize the enablePersistence() method, it returns void.

  this.firestore = firebase.firestore().enablePersistence();

Furthermore, I encounter an issue when attempting:

  this.firestore = firebase.firestore();
  this.firestore.enablePersistence() // error - cannot adjust settings after initialization of firestore.

I have been searching for a TypeScript or JavaScript equivalent of Dart's cascade operator (Dart Documentation) without success.

javascript typescript firebase google-cloud-firestore

Answer 1

Answer №1

There are several factors that can result in a void return for the persistence call:

If there is an incompatible version with offline data, certain services may not be implemented for this feature, such as Node.js. It's essential to ensure compatibility with your server before enabling persistence. Additionally, having multiple tabs open can lead to errors as persistence can only be enabled in one tab at a time. Offline persistence is currently supported by Chrome, Safari, and Firefox browsers.
When making an asynchronous call using promises, the initial value returned may be void until the response is received. Once the promise resolves, the value will no longer be void. For more information on how promises work, refer to the promise documentation.
Failing to handle promises properly can cause issues, leading to warnings like UnhandledPromiseRejectionWarning. Ensure that promises are handled correctly, either by using catch blocks or proper error handling methods. Refer to Firebase's guide on enabling offline mode for more details.


    firebase.firestore().enablePersistence()
      .catch((err) => {
          if (err.code == 'failed-precondition') {
              // Handle multiple tabs open
              // ...
          } else if (err.code == 'unimplemented') {
              // Browser does not support required features
              // ...
          }
      });
    // Subsequent queries will use persistence if successfully enabled

Using server-side rendering without care could lead to mistakes. To address this, utilize process.browser as demonstrated in this example of process browser usage. This method has been successful with Next.js, Node, and Vue projects.

    if (process.browser) {
      console.log('this code will only run on the browser')
    }

Cascade Operator Consider starting a new discussion thread to explore the cascade operator concept further, as it is a separate topic which may benefit from additional insights. A blog post detailing how to simulate the cascade operator in JavaScript can be found here. While there isn't an exact equivalent, alternative methods exist to achieve similar functionality.

Answer 2

There are several factors that can result in a void return for the persistence call:

If there is an incompatible version with offline data, certain services may not be implemented for this feature, such as Node.js. It's essential to ensure compatibility with your server before enabling persistence. Additionally, having multiple tabs open can lead to errors as persistence can only be enabled in one tab at a time. Offline persistence is currently supported by Chrome, Safari, and Firefox browsers.
When making an asynchronous call using promises, the initial value returned may be void until the response is received. Once the promise resolves, the value will no longer be void. For more information on how promises work, refer to the promise documentation.
Failing to handle promises properly can cause issues, leading to warnings like UnhandledPromiseRejectionWarning. Ensure that promises are handled correctly, either by using catch blocks or proper error handling methods. Refer to Firebase's guide on enabling offline mode for more details.


    firebase.firestore().enablePersistence()
      .catch((err) => {
          if (err.code == 'failed-precondition') {
              // Handle multiple tabs open
              // ...
          } else if (err.code == 'unimplemented') {
              // Browser does not support required features
              // ...
          }
      });
    // Subsequent queries will use persistence if successfully enabled

Using server-side rendering without care could lead to mistakes. To address this, utilize process.browser as demonstrated in this example of process browser usage. This method has been successful with Next.js, Node, and Vue projects.

    if (process.browser) {
      console.log('this code will only run on the browser')
    }

Cascade Operator Consider starting a new discussion thread to explore the cascade operator concept further, as it is a separate topic which may benefit from additional insights. A blog post detailing how to simulate the cascade operator in JavaScript can be found here. While there isn't an exact equivalent, alternative methods exist to achieve similar functionality.

Answer 3

Answer №2

Here is my approach for implementing the latest version (v9):

import {
  connectFirestoreEmulator,
  enableIndexedDbPersistence,
  getFirestore,
} from 'firebase/firestore';

export const getInitializedFirestore = () => {
  const firestore = getFirestore();

  // Checking and enabling emulator only in development mode, if not already enabled
  if (
    process.env.NODE_ENV === 'development' &&
    (firestore as any)._getSettings().host === 'firestore.googleapis.com'
  ) {
    connectFirestoreEmulator(getFirestore(), '127.0.0.1', 8080);
    console.log('Firestore emulator attached!');
  }

  // Enabling indexeddb only if firestore client hasn't been fully initialized
  if (!(firestore as any)._firestoreClient) {
    enableIndexedDbPersistence(firestore)
      .then(() => console.log('Persistence enabled!'))
      .catch((err) => console.error(err.message));
  }
  return firestore;
};

Make sure to replace all instances of getFirestore() with getInitializedFirestore().

This implementation ensures Hot Module Replacement (HMR) and page refresh safety in development mode to prevent errors. It can also be seamlessly deployed to production without any additional adjustments needed.

By leveraging the type system, we are able to access hidden properties in the Firebase SDK that indicate whether the emulator or persistence has been enabled.

Answer 4

Here is my approach for implementing the latest version (v9):

import {
  connectFirestoreEmulator,
  enableIndexedDbPersistence,
  getFirestore,
} from 'firebase/firestore';

export const getInitializedFirestore = () => {
  const firestore = getFirestore();

  // Checking and enabling emulator only in development mode, if not already enabled
  if (
    process.env.NODE_ENV === 'development' &&
    (firestore as any)._getSettings().host === 'firestore.googleapis.com'
  ) {
    connectFirestoreEmulator(getFirestore(), '127.0.0.1', 8080);
    console.log('Firestore emulator attached!');
  }

  // Enabling indexeddb only if firestore client hasn't been fully initialized
  if (!(firestore as any)._firestoreClient) {
    enableIndexedDbPersistence(firestore)
      .then(() => console.log('Persistence enabled!'))
      .catch((err) => console.error(err.message));
  }
  return firestore;
};

Make sure to replace all instances of getFirestore() with getInitializedFirestore().

This implementation ensures Hot Module Replacement (HMR) and page refresh safety in development mode to prevent errors. It can also be seamlessly deployed to production without any additional adjustments needed.

By leveraging the type system, we are able to access hidden properties in the Firebase SDK that indicate whether the emulator or persistence has been enabled.

Activate offline storage for Cloud Firestore

Answer №1

Answer №2

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