Service workers are also intended to be used for such things as:

Background data synchronization.
Responding to resource requests from other origins.
Receiving centralized updates to expensive-to-calculate data such as geolocation or gyroscope, so multiple pages can make use of one set of data.
Client-side compiling and dependency management of CoffeeScript, less, CJS/AMD modules, etc. for development purposes.
Hooks for background services.
Custom templating based on certain URL patterns.
Performance enhancements, for example pre-fetching resources that the user is likely to need in the near future, such as the next few pictures in a photo album.
In the future, service workers will be able to do a number of other useful things for the web platform that will bring it closer towards native app viability. Interestingly, other specifications can and will start to make use of the service worker context, for example:

Background synchronization: Start up a service worker even when no users are at the site, so caches can be updated, etc.
Reacting to push messages: Start up a service worker to send users a message to tell them new content is available.
Reacting to a particular time & date.
Entering a geo-fence.

Make sure that you specify a version when you use the unpkg cdn. If you do not your app could break when breaking changes are introduced to App Bridge.

Unpkg supports using a semver range to link to a major or minor version number. For example, https://unpkg.com/@shopify/app-bridge@1 resolves to the latest version of Shopify App Bridge version 1, but will not resolve to any version that begins with 2.

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