https://www.freshairstudios.co.uk/sw.js

1// SERVE ALL THE THINGS!!!
2/* global self */
3self.addEventListener("fetch", event => {
4    if (event.request.method === "GET") {
5        event.respondWith(
6            /* global caches */
7            caches
8                .match(event.request)
9                .then(response => {
10                    if (response) {
11                        console.log("SERVICE WORKER::CACHE    " + response.url);
12                        return response;
13                    } else {
14                        // console.log( 'SERVICE WORKER::LIVE     ' + event.request.url )
15                        return fetch(event.request);
16                    }
17                })
18                .catch(error => {
19                    if (event.request.method === "GET") {
20                        console.warn(
21                            "SERVICE WORKER::FAILED   fetch(" +
22                            event.request.url +
23                            ") failed",
24                            error
25                        );
26                        return caches.match("offline.html");
27                    } else {
28                        console.warn(
29                            "SERVICE WORKER::FAILED   " + event.request.method,
30                            error
31                        );
32                    }
33                })
34        );
35    }
36});