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Reviewer's Guide by SourceryThis pull request implements a Progressive Web App (PWA) setup. It includes adding Workbox dependencies, configuring meta tags and a manifest file, registering a service worker, and creating an offline page. The service worker caches static assets and serves them when the user is offline, providing a better user experience. Sequence diagram for service worker registrationsequenceDiagram
participant Browser
participant ServiceWorkerRegistration
participant ServiceWorker
Browser->>ServiceWorkerRegistration: register('/service-worker.js')
activate ServiceWorkerRegistration
ServiceWorkerRegistration-->>Browser: Registration object
deactivate ServiceWorkerRegistration
Browser->>ServiceWorker: Install event
activate ServiceWorker
ServiceWorker->>CacheStorage: Open cache
activate CacheStorage
CacheStorage-->>ServiceWorker: Cache object
deactivate CacheStorage
ServiceWorker->>Cache: Add static assets
activate Cache
Cache-->>ServiceWorker: Success
deactivate Cache
ServiceWorker-->>Browser: Installation complete
deactivate ServiceWorker
Browser->>ServiceWorker: Activate event
activate ServiceWorker
ServiceWorker->>CacheStorage: Get cache keys
activate CacheStorage
CacheStorage-->>ServiceWorker: Cache keys
deactivate CacheStorage
ServiceWorker->>CacheStorage: Delete old caches
activate CacheStorage
CacheStorage-->>ServiceWorker: Success
deactivate CacheStorage
ServiceWorker-->>Browser: Activation complete
deactivate ServiceWorker
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Dependency Review✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.OpenSSF ScorecardScorecard details
Scanned Manifest Filespackage-lock.json
package.json
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Deploying champion-trader with
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| Latest commit: |
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| Status: | ✅ Deploy successful! |
| Preview URL: | https://d1fd7912.champion-trader.pages.dev |
| Branch Preview URL: | https://spike-pwa.champion-trader.pages.dev |
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Hey @aum-deriv - I've reviewed your changes - here's some feedback:
Overall Comments:
- Consider using a build tool plugin like WorkboxWebpackPlugin to generate the service worker file instead of manually creating it.
- The service worker registration code includes a check for localhost, which might not be necessary in all environments.
Here's what I looked at during the review
- 🟢 General issues: all looks good
- 🟢 Security: all looks good
- 🟢 Testing: all looks good
- 🟡 Complexity: 1 issue found
- 🟢 Documentation: all looks good
Help me be more useful! Please click 👍 or 👎 on each comment and I'll use the feedback to improve your reviews.
| onUpdate?: (registration: ServiceWorkerRegistration) => void; | ||
| }; | ||
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| export function register(config?: Config): void { |
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issue (complexity): Consider refactoring the asynchronous logic using async/await and extracting common functionality to reduce nested control flow and improve readability.
Consider reducing the nested control flow by refactoring the asynchronous logic into async/await functions and extracting common functionality. For example, you can refactor the registration functions to avoid double branching and nested callbacks. One approach is:
async function registerValidSW(swUrl: string, config?: Config): Promise<void> {
try {
const registration = await navigator.serviceWorker.register(swUrl);
registration.onupdatefound = () => {
const installingWorker = registration.installing;
if (!installingWorker) return;
installingWorker.onstatechange = () => {
if (installingWorker.state !== "installed") return;
if (navigator.serviceWorker.controller) {
console.log(
"New content is available and will be used when all tabs are closed. See https://cra.link/PWA."
);
config?.onUpdate?.(registration);
} else {
console.log("Content is cached for offline use.");
config?.onSuccess?.(registration);
}
};
};
} catch (error) {
console.error("Error during service worker registration:", error);
}
}Similarly, refactor checkValidServiceWorker to reduce nesting:
async function checkValidServiceWorker(swUrl: string, config?: Config): Promise<void> {
try {
const response = await fetch(swUrl, { headers: { "Service-Worker": "script" } });
const contentType = response.headers.get("content-type");
if (
response.status === 404 ||
(contentType && contentType.indexOf("javascript") === -1)
) {
const registration = await navigator.serviceWorker.ready;
await registration.unregister();
window.location.reload();
} else {
// Found a valid service worker so proceed with registration.
await registerValidSW(swUrl, config);
}
} catch {
console.log("No internet connection found. App is running in offline mode.");
}
}Then, in your register function, the flow becomes simpler:
export function register(config?: Config): void {
if ("serviceWorker" in navigator) {
const publicUrl = new URL("", window.location.href);
if (publicUrl.origin !== window.location.origin) return;
window.addEventListener("load", () => {
const swUrl = "/service-worker.js";
if (isLocalhost) {
checkValidServiceWorker(swUrl, config);
navigator.serviceWorker.ready.then(() => {
console.log(
"This web app is being served cache-first by a service worker. To learn more, visit https://cra.link/PWA"
);
});
} else {
registerValidSW(swUrl, config);
}
});
}
}This approach reduces nesting, keeps the functionality intact, and makes maintenance easier.
…into spike-pwa
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Summary by Sourcery
Adds Progressive Web App (PWA) functionality to the application, enabling offline access and installability.
New Features: