Upgrade Angular from 9.0.1 to 20.3.4 with comprehensive testing #70
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Major Changes: - Upgraded Angular incrementally through all major versions (10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20) - Final versions: Angular 20.3.4, CLI 20.3.5, TypeScript 5.8.3, RxJS 7.8.2, zone.js 0.15.1 - Migrated from TSLint to ESLint (Angular 11 upgrade) - Fixed all RxJS import paths (Observable, Subscription from 'rxjs' instead of 'rxjs/Observable') - Updated zone.js imports in test.ts - Renamed browserslist to .browserslistrc (Angular 12+ requirement) Testing: - Created comprehensive unit tests for 11 components (AppComponent, HeaderComponent, FooterComponent, SettingsComponent, FeedComponent, ItemComponent, ItemDetailsComponent, CommentComponent, UserComponent, LoaderComponent, ErrorMessageComponent) - Created unit tests for 2 services (HackerNewsAPIService, SettingsService) - Updated Karma configuration for ChromeHeadless testing - All tests use Jasmine with proper TestBed patterns and mock dependencies Visual Verification Completed: - All 5 feed types working (News, Newest, Show, Ask, Jobs) - Pagination (forward and backward) working correctly - Item details with nested comments and collapse/expand functionality - User profile viewing with error handling - Settings panel with theme switching (Default, Night, Black AMOLED) - Theme persistence via localStorage across navigation and reload - Mobile responsive design tested and working - All features visually verified in browser Configuration Updates: - Updated angular.json for Angular 20 build system - Updated tsconfig.json for TypeScript 5.8 - Updated karma.conf.js for headless Chrome testing - Maintained Service Worker PWA functionality - All existing features preserved Link to Devin run: https://app.devin.ai/sessions/c2504bbca0bb4fb989f0a8f492ad5bab Requested by: @kevintang513 Co-Authored-By: Kevin Tang <[email protected]>
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Upgrade Angular from 9.0.1 to 20.3.4 with comprehensive testing
Summary
This PR performs a major Angular upgrade from version 9.0.1 to 20.3.4 (spanning 11 major versions) while adding comprehensive unit test coverage that was previously missing. The upgrade was performed incrementally through each major Angular version to handle breaking changes properly.
Key Changes:
rxjs/ObservabletorxjsTesting Added:
Configuration Updates:
angular.jsonfor Angular 20 build systembrowserslist→.browserslistrc(Angular 12+ requirement)Review & Testing Checklist for Human
npm run build+ serve from dist/)npm run buildsucceeds and app runs correctly from production build with reasonable bundle sizesNotes
Risk Assessment: This is a high-risk change due to the massive version jump. While I performed comprehensive visual testing and all features appeared to work correctly, there may be subtle regressions or edge cases that only surface with real usage patterns.
Screenshots available: I have browser screenshots of the visual testing process showing all major features working, which can be shared if needed.
Session Details: