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Notice that the "lib" property contains a value for "webworker" among the values. This is important because it indicates to the TypeScript compiler that it should load the type definitions for the Worker APIs.
You can test the service worker by running your project locally with the http-server npm package. First make sure to compile the TypeScript service worker code by using the command npm run build-typecheck. Then, to install the http-server npm package run the command npm i http-server --save-dev. After installing run the command http-server in your project folder where the index.html and offline.html pages are. You should then see your website in the browser by navigating to the default http-server url localhost:8080. With browser dev tools you can inspect your website including managing service worker installation state and cache status.
In this example, TypeScript is used to create a service worker with a network first then cache, caching strategy, to support viewing previously visited pages when offline. When there is no network connection available and a previous page version is not cached, the service worker will display an offline page.