PWA Fire Codelabs are guided, tutorial, hands-on coding experience to step you through the process of building great Progressive Web Apps experiences.
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A web manifest is basically a json file, that is; JavaScript Object Notation. It includes a bunch of Meta information about your site, in this case, your progressive web app.
Your code will definitely become longer and more complex as you try to solve complex problems with Javascript. But there is an easy way to fix this. No need to giving up on JS code yet!