💬 JAVASCRIPT - Firebase service worker with custom icon and "fallback icon", notification click_action and custom data.
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You can pass an icon through the Firebase interface, otherwise the default icon will be YOUR_APP_DOMAIN/icons/firebase-logo.png
click_action is an optional parameter that must be entered in the notification panel of firebase cloud messaging as shown below. When clicking on the notification, the user will be redirected to the link informed as the value of the click_action parameter, if the parameter is not informed the user will be redirected to the host of the application
