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Check if config callbacks are defined before using them (next) #5368

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Check if config callbacks are defined before using them (next) #5368

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4 changes: 2 additions & 2 deletions packages/react-scripts/template/src/serviceWorker.js
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Original file line number Diff line number Diff line change
Expand Up @@ -68,7 +68,7 @@ function registerValidSW(swUrl, config) {
console.log('New content is available; please refresh.');

// Execute callback
if (config.onUpdate) {
if (config && config.onUpdate) {
config.onUpdate(registration);
}
} else {
Expand All @@ -78,7 +78,7 @@ function registerValidSW(swUrl, config) {
console.log('Content is cached for offline use.');

// Execute callback
if (config.onSuccess) {
if (config && config.onSuccess) {
config.onSuccess(registration);
}
}
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