René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"AOT builds with TypeScript 5.6 or later are slower in Angular 19","articleBody":"### Command\n\nserve\n\n### Is this a regression?\n\n- [x] Yes, this behavior used to work in the previous version\n\n### The previous version in which this bug was not present was\n\n18.0.1\n\n### Description\n\nAfter upgrading my project from Angular 18 to Angular 19 using ng update, I've noticed a significant performance degradation with ng serve. Previously, rebuilds were much faster, but now they take up to 10 seconds or more.\n![Image](https://github.com/user-attachments/assets/46a12f96-f48c-4f42-93e3-e4fe4a2bfcab)\n\n![Image](https://github.com/user-attachments/assets/d4edeed7-f77f-44a9-828f-279da77eddd9)\n\n\n### Minimal Reproduction\n\nhttps://github.com/Oussemasahbeni/saha-meter-frontend\n\nI made the repo public until the issue got resolved, its a close source project for my company\nPlease check the clean-up branch\n\n### Exception or Error\n\n```text\n\n```\n\n### Your Environment\n\n```text\nAngular CLI: 19.0.2\nNode: 22.11.0\nPackage Manager: npm 10.9.0\nOS: win32 x64\n\nAngular: 19.0.1\n... animations, cdk, common, compiler, compiler-cli, core, forms\n... material, material-luxon-adapter, platform-browser\n... platform-browser-dynamic, router, service-worker\n... youtube-player\n\nPackage                         Version\n---------------------------------------------------------\n@angular-devkit/architect       0.1900.2\n@angular-devkit/build-angular   19.0.2\n@angular-devkit/core            19.0.2\n@angular-devkit/schematics      19.0.2\n@angular/build                  19.0.2\n@angular/cli                    19.0.2\n@schematics/angular             19.0.2\nrxjs                            7.8.1\ntypescript                      5.6.3\nzone.js                         0.15.0\n```\n\n### Anything else relevant?\n\nI managed to make it a little bit faster by disabling aot in development\n```\n\"development\": {\n                            \"optimization\": false,\n                            \"extractLicenses\": false,\n                            \"aot\":false,\n                            \"sourceMap\": true\n                        }\n```\nbut still a lot of people told that is not a solution but a workaround and it can hurt the project in the long term","author":{"url":"https://github.com/Oussemasahbeni","@type":"Person","name":"Oussemasahbeni"},"datePublished":"2024-12-04T08:13:07.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":19},"url":"https://github.com/59040/angular/issues/59040"}