fix: add thorough error message

patches/workbox-precaching+6.5.3.patch

@@ -1,16 +1,58 @@
 diff --git a/node_modules/workbox-precaching/PrecacheController.js b/node_modules/workbox-precaching/PrecacheController.js
-index e00975e..b67ba2b 100644
+index e00975e..bfee1cb 100644
 --- a/node_modules/workbox-precaching/PrecacheController.js
 +++ b/node_modules/workbox-precaching/PrecacheController.js
-@@ -164,7 +164,10 @@ class PrecacheController {
+@@ -150,6 +150,7 @@ class PrecacheController {
+         return waitUntil(event, async () => {
+             const installReportPlugin = new PrecacheInstallReportPlugin();
+             this.strategy.plugins.push(installReportPlugin);
++            const failedUrls = []
+             // Cache entries one at a time.
+             // See https://github.com/GoogleChrome/workbox/issues/2528
+             for (const [url, cacheKey] of this._urlsToCacheKeys) {
+@@ -164,12 +165,44 @@ class PrecacheController {
                      params: { cacheKey },
                      request,
                      event,
 -                }));
-+                })).catch(err => {
-+                    console.warn("Whoops! There was a precaching error. This app may be missing important assets.")
++                }))
++                // DHIS2: Catch precaching errors to provide a more thorough 
++                // error message
++                .catch(err => {
++                    failedUrls.push(url)
 +                    console.error(err)
 +                });
              }
              const { updatedURLs, notUpdatedURLs } = installReportPlugin;
              if (process.env.NODE_ENV !== 'production') {
+                 printInstallDetails(updatedURLs, notUpdatedURLs);
+             }
++            // DHIS2: Log failed requests to give clear feedback, and throw 
++            // error to abort installation
++            if (failedUrls.length > 0) {
++                const appVersion = process.env.REACT_APP_DHIS2_APP_VERSION
++                const appName = process.env.REACT_APP_DHIS2_APP_NAME
++                const errorMessage = 
++                    `Some assets were unable to be fetched and cached when ` +
++                    `installing ${appName} version ${appVersion}, so the ` +
++                    `installation has been aborted.\n\n` + 
++                    `If another version of the app is installed in the browser, ` +
++                    `you will continue to see that version. If not, you will ` +
++                    `see version ${appVersion}, but caching and offline ` +
++                    `features will be unavailable, and the app may not be ` +
++                    `fully functional due to the missing files. You can find ` +
++                    `the app version that's currently active at the bottom ` +
++                    `of the user profile menu.\n\n` +
++                    `[FOR TECHNICAL USERS]: If another version is installed ` +
++                    `and you would like to attempt to view version ` +
++                    `${appVersion} (knowing the above caveats), you may use ` +
++                    `your browser's developer tools to find the service worker ` +
++                    `that's currently active for this app and unregister it.\n\n` +
++                    `These are the files that were unable to be fetched and cached:\n` +
++                    `${failedUrls.reduce((acc, curr) => acc + ` * ${curr}\n`, '')}`
++                throw new Error(errorMessage)
++            }
++
+             return { updatedURLs, notUpdatedURLs };
+         });
+     }