index.html

<!DOCTYPE html>
<html lang="ja">
  <head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <link rel="manifest" href="./manifest.json" />
    <title>Markdown Editor</title>
  </head>

  <body>
    <div id="app"></div>
    <script src="./dist/index.js"></script>
    <script type="text/javascript">
      if ("serviceWorker" in navigator) {
        window.addEventListener("load", () => {
          navigator.serviceWorker.register("./sw.js").then(
            (registration) => {
              console.log(
                "ServiceWorker registration successful with scope: ",
                registration.scope
              );
            },
            (err) => {
              console.log("ServiceWorker registration failed: ", err);
            }
          );
        });
      }
    </script>
  </body>
</html>