Summary

By building a GitHub PWA, we learned how to create components that can be reused. We also looked at how to add props to let us pass data from a parent component to a child component. In the child component, we validate the props by checking the data type and specifying whether a prop is required. This way, we can easily see when a prop has a value that is unexpected.

We also looked at how to use watchers to watch for changes with reactive property values. Watchers can be added to watch for changes in any reactive property. We can watch the data that is being changed locally, and also the value of props. They are both reactive, so they will both trigger the watcher methods. We can run asynchronous code within a watcher, which is something that can't be done with computed properties.

Also, we had a look at lifecycle hooks of components. Each component also has its own lifecycle hooks. We can add our own code to the lifecycle methods, to run code when we want to run them. There are lifecycle hooks for all parts of a component lifecycle, including the beginning stage when it is loaded, through to when it is updated and destroyed.

Finally, we learned how to convert our Vue 3 web app into a PWA with a command-line plugin. We can add a plugin to our Vue project to create a PWA. With it, a service worker will be registered in our app to handle different connection types and caching.

In the next chapter, we will create a slider puzzle with Vue 3, with automated tests to test each part of our app.