avoid facebook/create-react-app#5299

peterbe · peterbe · commit 1b5b573fc507 · 2018-10-04T21:10:59.000-04:00
diff --git a/src/serviceWorker.js b/src/serviceWorker.js
@@ -69,7 +69,7 @@ function registerValidSW(swUrl, config) {
               window.location.reload();
 
               // Execute callback
-              if (config.onUpdate) {
+              if (config && config.onUpdate) {
                 config.onUpdate(registration);
               }
             } else {
@@ -79,7 +79,7 @@ function registerValidSW(swUrl, config) {
               console.log("Content is cached for offline use.");
 
               // Execute callback
-              if (config.onSuccess) {
+              if (config && config.onSuccess) {
                 config.onSuccess(registration);
               }
             }

Original file line number	Diff line number	Diff line change
`@@ -69,7 +69,7 @@ function registerValidSW(swUrl, config) {`
`69`	`69`	`window.location.reload();`
`70`	`70`
`71`	`71`	`// Execute callback`
`72`		`- if (config.onUpdate) {`
	`72`	`+ if (config && config.onUpdate) {`
`73`	`73`	`config.onUpdate(registration);`
`74`	`74`	`}`
`75`	`75`	`} else {`
`@@ -79,7 +79,7 @@ function registerValidSW(swUrl, config) {`
`79`	`79`	`console.log("Content is cached for offline use.");`
`80`	`80`
`81`	`81`	`// Execute callback`
`82`		`- if (config.onSuccess) {`
	`82`	`+ if (config && config.onSuccess) {`
`83`	`83`	`config.onSuccess(registration);`
`84`	`84`	`}`
`85`	`85`	`}`