componentDidMount Next.js SWprecache

index.js

componentDidMount() {
    if ("serviceWorker" in navigator) {
      navigator.serviceWorker
        .register("/service-worker.js")
        .then(registration => {
          console.log("service worker registration successful");
        })
        .catch(err => {
          console.warn("service worker registration failed", err.message);
        });
    }
  }