Utilize a service worker to automatically clear the app's cache whenever a new update is published

Currently, I am working on an ASP.Net Core App with Angular 8 for the front-end. However, I have encountered some issues with the cache when publishing a new version of my app. The DOM does not reflect the changes in the front end. To address this problem, I decided to install a service worker by using the following command:

ng add @angular/pwa@v8-lts

This installation process resulted in the creation of new files and modifications to existing ones as outlined below:

Modified Files:

  • angular.json
  • package-lock.json
  • package.json
  • index.html
  • app.module

Created Files:

  • manifest.webmanifest
  • ngsw-config.json

I researched how to clean the cache, and it was suggested that I add the following code snippet to the service worker:

constructor(updates: SwUpdate) {
    updates.available.subscribe(event => {
      if (promptUser(event)) {
        updates.activateUpdate().then(() => document.location.reload());
      }
    });
  }

My question now is, where exactly should I insert this code snippet? Do I need to create a new file for it? How do I bind it to my app effectively?

Answer №1

There's no need for it, all you have to do is hash the file names whenever you build your angular project. This way, with hashed file names, the browser won't be able to cache them. If that's the case, you can use this command:

ng build --output-hashing=all

Specify the mode for hashing output filenames to bust caches.

The generated files will look something like this:

main.62beb1fb93041eb44194.js

Answer №2

Developing a service that utilizes SwUpdate to scan for updates and perform forced reloads when necessary is essential. Utilizing APP_INITIALIZER, you can initiate this check upon app launch.

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