ServiceWorkerRegistration.update() can raise exceptions, so we need to
catch and handle them, otherwise it will crash redux sagas and the app
will stop responding.
Fixes: https://github.com/pybricks/pybricks-code/issues/1299
- registration is moved from top-level index to app/sagas.
- mock implementation is provided for tests
- actions are renamed to include "app" prefix
- actions are changed to not use non-serializable arguments
- reducers are changed to not use non-serializable state
This removed passing the BeforeInstallPromptEvent as an action argument
(action arguments should be serializable). Instead the saga just keeps
a reference to the event and actions are used only to resolve the state
of the UI.
The pattern we were using for actions required actions to be defined in
three places, an enum member containing the type string, an type
definition and a function. This combines all three of these into one by
using a helper function based on the ideas from [1].
[1]: https://phryneas.de/redux-typescript-no-discriminating-union
David Lechner