{"id":1210,"date":"2026-03-11T15:51:41","date_gmt":"2026-03-11T18:51:41","guid":{"rendered":"https:\/\/maurobernal.com.ar\/blog\/?p=1210"},"modified":"2026-03-11T16:12:27","modified_gmt":"2026-03-11T19:12:27","slug":"angular-migracion-19-20-a-21-guia-practica","status":"publish","type":"post","link":"https:\/\/maurobernal.com.ar\/blog\/angular-migracion-19-20-a-21-guia-practica\/","title":{"rendered":"Gu\u00eda pr\u00e1ctica: c\u00f3mo migr\u00e9 un proyecto de Angular 19\/20 a Angular 21.2 sin morir en el intento"},"content":{"rendered":"\n

Migrar un proyecto Angular de v19\/20 a v21 puede sonar intimidante. En la pr\u00e1ctica, si segu\u00eds el proceso correcto, es incremental: cada paso es reversible y el proyecto sigue funcionando en todo momento. Esta es la gu\u00eda que apliqu\u00e9 en proyectos reales.<\/p>\n\n\n\n

Antes de empezar: el inventario<\/h2>\n\n\n\n
# Ver versi\u00f3n actual y dependencias desactualizadas\nng version\nng update\n\n# Verificar compatibilidad antes de actualizar\nnpx npm-check-updates -u --target minor<\/code><\/pre>\n\n\n\n
Paso 1: Actualizar el core<\/h2>\n\n\n\n
# Siempre de a una versi\u00f3n mayor a la vez\n# Si est\u00e1s en v19, primero actualizar a v20, luego a v21\n\n# De v20 a v21:\nng update @angular\/core@21 @angular\/cli@21\n\n# El comando aplica schematics autom\u00e1ticos:\n# - Actualiza imports deprecated\n# - Adapta APIs que cambiaron\n# - Avisa sobre cambios manuales necesarios\n\n# Verificar que compila\nng build --configuration production<\/code><\/pre>\n\n\n\n
Paso 2: Adoptar Zoneless<\/h2>\n\n\n\n
\/\/ app.config.ts\nimport { provideZonelessChangeDetection } from '@angular\/core';\n\nexport const appConfig: ApplicationConfig = {\n  providers: [\n    provideZonelessChangeDetection(),\n    provideRouter(routes)\n  ]\n};\n\n\/\/ angular.json: \"polyfills\": []  \/\/ eliminar zone.js\n\/\/ npm uninstall zone.js<\/code><\/pre>\n\n\n\n
Paso 3: Migrar de Karma a Vitest<\/h2>\n\n\n\n
ng generate @angular\/build:vitest\nng test  # verificar que los tests pasan\nnpm uninstall karma karma-chrome-launcher karma-coverage karma-jasmine karma-jasmine-html-reporter<\/code><\/pre>\n\n\n\n
Paso 4: Standalone components<\/h2>\n\n\n\n
# Angular 21 asume standalone por defecto\n# Migraci\u00f3n autom\u00e1tica:\nng generate @angular\/core:standalone --mode=convert-to-standalone\nng generate @angular\/core:standalone --mode=prune-ng-modules\nng generate @angular\/core:standalone --mode=standalone-bootstrap<\/code><\/pre>\n\n\n\n
Checklist completo<\/h2>\n\n\n\n
\n
Paso<\/th>Acci\u00f3n<\/th>Obligatorio<\/th><\/tr><\/thead>
1<\/td>ng update @angular\/core@21 @angular\/cli@21<\/code><\/td>✅ S\u00ed<\/td><\/tr>\n
2<\/td>Verificar que la app compila y los tests pasan<\/td>✅ S\u00ed<\/td><\/tr>\n
3<\/td>Activar provideZonelessChangeDetection()<\/code><\/td>Recomendado<\/td><\/tr>\n
4<\/td>Eliminar Zone.js de polyfills<\/td>Con paso 3<\/td><\/tr>\n
5<\/td>Migrar a Vitest<\/td>Recomendado<\/td><\/tr>\n
6<\/td>Nuevos formularios con Signal Forms<\/td>Gradual<\/td><\/tr>\n
7<\/td>Componentes de nav con funciones standalone del Router<\/td>Gradual<\/td><\/tr>\n
8<\/td>Configurar ng mcp<\/code> para integraci\u00f3n con IA<\/td>Opcional<\/td><\/tr>\n<\/tbody><\/table><\/figure>\n\n\n\n
Errores comunes y c\u00f3mo resolverlos<\/h2>\n\n\n\n
\/\/ ERROR: El componente no se actualiza despu\u00e9s de activar Zoneless\n\/\/ \u2192 Convertir estado a Signals o llamar markForCheck()\n\n\/\/ ERROR: Tests fallan con \"No current Angular test\" despu\u00e9s de Vitest\n\/\/ \u2192 Verificar imports de @angular\/core\/testing\n\n\/\/ ERROR: \"Cannot find module zone.js\"\n\/\/ \u2192 Buscar y eliminar import 'zone.js' en el proyecto:\n\/\/ grep -r \"import 'zone.js'\" src\/\n\n\/\/ ERROR: ExpressionChangedAfterItHasBeenCheckedError en Zoneless\n\/\/ \u2192 Usar signal.update() o signal.set() en lugar de mutaci\u00f3n directa<\/code><\/pre>\n\n\n\n
Mi experiencia: cu\u00e1nto tard\u00f3 la migraci\u00f3n<\/h2>\n\n\n\n
En un proyecto de tama\u00f1o medio (45 componentes, 12 servicios, 80 tests): el ng update<\/code> tard\u00f3 10 minutos. Revisar avisos y corregir deprecaciones: media jornada. Migraci\u00f3n a Zoneless con todos los tests adaptados a Vitest: un d\u00eda. Adopci\u00f3n gradual de Signal Forms en los formularios principales: dos semanas, a medida que toc\u00e1bamos cada m\u00f3dulo.<\/p>\n\n\n\n
No es un proceso de un fin de semana, pero tampoco es una reescritura. Es una evoluci\u00f3n incremental que pod\u00e9s hacer en paralelo con el trabajo normal del equipo.<\/p>\n\n
\n
\u2190 Art\u00edculo anterior: Router Signals en Angular 21: navegaci\u00f3n standalone sin cargar todo el Router<\/a> | Fin de la Serie Angular 20 \u2192 21.2<\/strong><\/em><\/p>\n
\u00bfTen\u00e9s preguntas sobre la migraci\u00f3n en tu proyecto espec\u00edfico? Dej\u00e1 tu caso en los comentarios. 👇<\/em><\/p>","protected":false},"excerpt":{"rendered":"
Paso a paso para migrar de Angular 19\/20 a Angular 21.2: ng update, Zoneless, Vitest, Signal Forms y standalone. Checklist completo, errores comunes y tiempos reales.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[273],"tags":[274,291,242,289,278,290,284,279],"class_list":["post-1210","post","type-post","status-publish","format-standard","hentry","category-angular","tag-angular","tag-angular21","tag-devops","tag-migration","tag-typescript","tag-upgrade","tag-vitest","tag-zoneless"],"yoast_head":"\nGu\u00eda pr\u00e1ctica: c\u00f3mo migr\u00e9 un proyecto de Angular 19\/20 a Angular 21.2 sin morir en el intento · devops Mauro Bernal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/maurobernal.com.ar\/blog\/angular-migracion-19-20-a-21-guia-practica\/\" \/>\n<meta property=\"og:locale\" content=\"es_ES\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Gu\u00eda pr\u00e1ctica: c\u00f3mo migr\u00e9 un proyecto de Angular 19\/20 a Angular 21.2 sin morir en el intento · devops Mauro Bernal\" \/>\n<meta property=\"og:description\" content=\"Paso a paso para migrar de Angular 19\/20 a Angular 21.2: ng update, Zoneless, Vitest, Signal Forms y standalone. 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