Angular: Default to standalone components in Angular v19

[ingowagner]

Closes #29671

What I did

Checklist for Contributors

Testing

The changes in this PR are covered in the following automated tests:

• stories
• unit tests
• integration tests
• end-to-end tests

Manual testing

This section is mandatory for all contributions. If you believe no manual test is necessary, please state so explicitly. Thanks!

Documentation

• Add or update documentation reflecting your changes
• If you are deprecating/removing a feature, make sure to update
  MIGRATION.MD

Checklist for Maintainers

• When this PR is ready for testing, make sure to add ci:normal, ci:merged or ci:daily GH label to it to run a specific set of sandboxes. The particular set of sandboxes can be found in code/lib/cli-storybook/src/sandbox-templates.ts

• Make sure this PR contains one of the labels below:

  Available labels

  • bug: Internal changes that fixes incorrect behavior.
  • maintenance: User-facing maintenance tasks.
  • dependencies: Upgrading (sometimes downgrading) dependencies.
  • build: Internal-facing build tooling & test updates. Will not show up in release changelog.
  • cleanup: Minor cleanup style change. Will not show up in release changelog.
  • documentation: Documentation only changes. Will not show up in release changelog.
  • feature request: Introducing a new feature.
  • BREAKING CHANGE: Changes that break compatibility in some way with current major version.
  • other: Changes that don't fit in the above categories.

🦋 Canary release

This PR does not have a canary release associated. You can request a canary release of this pull request by mentioning the @storybookjs/core team here.

core team members can create a canary release here or locally with gh workflow run --repo storybookjs/storybook canary-release-pr.yml --field pr=<PR_NUMBER>

name	before	after	diff	z	%
createSize	0 B	0 B	0 B	-	-
generateSize	78.4 MB	78.4 MB	0 B	-0.22	0%
initSize	144 MB	144 MB	0 B	-0.64	0%
diffSize	65.1 MB	65.1 MB	0 B	-0.83	0%
buildSize	6.83 MB	6.83 MB	0 B	-1.05	0%
buildSbAddonsSize	1.51 MB	1.51 MB	0 B	-	0%
buildSbCommonSize	195 kB	195 kB	0 B	-	0%
buildSbManagerSize	1.86 MB	1.86 MB	0 B	-1.09	0%
buildSbPreviewSize	271 kB	271 kB	0 B	-	0%
buildStaticSize	0 B	0 B	0 B	-	-
buildPrebuildSize	3.83 MB	3.83 MB	0 B	-1.09	0%
buildPreviewSize	3 MB	3 MB	0 B	0.95	0%
testBuildSize	0 B	0 B	0 B	-	-
testBuildSbAddonsSize	0 B	0 B	0 B	-	-
testBuildSbCommonSize	0 B	0 B	0 B	-	-
testBuildSbManagerSize	0 B	0 B	0 B	-	-
testBuildSbPreviewSize	0 B	0 B	0 B	-	-
testBuildStaticSize	0 B	0 B	0 B	-	-
testBuildPrebuildSize	0 B	0 B	0 B	-	-
testBuildPreviewSize	0 B	0 B	0 B	-	-

name	before	after	diff	z	%
createTime	15.5s	6.6s	-8s -879ms	-1.7	🔰-134.1%
generateTime	19.4s	19.4s	-24ms	-0.55	-0.1%
initTime	13.3s	13.1s	-211ms	-1.01	-1.6%
buildTime	7.7s	7.5s	-179ms	-1.33	-2.4%
testBuildTime	0ms	0ms	0ms	-	-
devPreviewResponsive	5.8s	7.5s	1.6s	2.84	🔺22.4%
devManagerResponsive	3.5s	4.6s	1.1s	3.34	🔺24%
devManagerHeaderVisible	587ms	736ms	149ms	2.6	🔺20.2%
devManagerIndexVisible	668ms	832ms	164ms	2.41	🔺19.7%
devStoryVisibleUncached	1.2s	1.1s	-108ms	0.54	-9.5%
devStoryVisible	624ms	824ms	200ms	2.6	🔺24.3%
devAutodocsVisible	542ms	739ms	197ms	4.73	🔺26.7%
devMDXVisible	701ms	674ms	-27ms	2.22	-4%
buildManagerHeaderVisible	584ms	850ms	266ms	4.68	🔺31.3%
buildManagerIndexVisible	603ms	910ms	307ms	5.08	🔺33.7%
buildStoryVisible	583ms	849ms	266ms	4.6	🔺31.3%
buildAutodocsVisible	479ms	608ms	129ms	2.34	🔺21.2%
buildMDXVisible	478ms	611ms	133ms	3.23	🔺21.8%

Greptile Summary

This PR modifies the standalone component behavior in Angular's PropertyExtractor to align with Angular 19's new default where components are standalone by default unless explicitly specified otherwise.

• Added version check using VERSION.major to determine default isStandalone value in PropertyExtractor.analyzeDecorators
• Set isStandalone to true by default for Angular >= 19 when undefined
• Set isStandalone to false by default for Angular < 19 when undefined
• Maintains existing decorator analysis logic for explicitly defined standalone values

[greptile-apps]

LGTM

_{1 file(s) reviewed, no comment(s)
Edit PR Review Bot Settings | Greptile}

[yannbf]

Hey @ingowagner thank you so much for your contribution! <3

[nx-cloud]

☁️ Nx Cloud Report

CI is running/has finished running commands for commit 1c9f923. As they complete they will appear below. Click to see the status, the terminal output, and the build insights.

📂 See all runs for this CI Pipeline Execution

---

✅ Successfully ran 1 target

• nx run-many -t build --parallel=3

---

Sent with 💌 from NxCloud.