microsoft/react-native-windows
Pull Request Overview
- Opened on October 18, 2026
- Status Merged
- Commit count 4 with first commit October 18, 2026
Total Delta
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0.0 days | Authoring 1 commit before pull request opened for review |
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0.0 days | Awaiting first review |
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Fix nightly library scaffold version selection
Description
Type of Change
- Bug fix (non-breaking change which fixes an issue)
- This change requires a documentation update
Why
Nightly library initialization fails before project generation because its
bootstrap selects either the literal latest or an RN dist-tag without a matching
template. This also blocks the feed warmer's main-library closure.
Related: microsoft/react-native-windows#16489;
the failure predates that trigger-only change.
What
-
Checked bootstrap. Both callers share cRNL 0.63.0's supported RN 0.85.0
bootstrap and check the exact RN/template pair through the configured registry,
so dist-tags cannot select an incompatible scaffold. -
Preserved targets. Stable versions stay unchanged. Nightly library and
example dependencies still return to the requested RN/CLI versions before
resolution; a failed branch does not discard healthy closures. -
Regression coverage. Command-level tests and policy documentation cover
shared selection, checkout paths, and explicit failures, so generator upgrades cannot
silently reuse an unreviewed bootstrap.
Screenshots
Not applicable; no UI changes.
Testing
-
yarn test --scope @rnw-scripts/warm-feed- passed, 105 tests with inherited uppercase npm settings. -
yarn workspace @rnw-scripts/warm-feed lint- passed; changed-file formatting was also checked explicitly. -
yarn workspace @rnw-scripts/warm-feed build- passed.
Real Windows scaffolding with an empty npm cache and anonymous feed access
passed, including both nightly manifest rewrites, actual warmer collection, and
both dependency-graph resolutions. Full clean-agent/native CI validation is pending.
Changelog
Should this change be included in the release notes: yes
Use a compatible bootstrap when creating Windows libraries against nightly React Native.
Microsoft Reviewers: Open in CodeFlow
Comments Threads Pending Resolution
### ð¢ Approval recommended
No unresolved blocking issues remain, and targeted regressions cover selection, path handling, dependency preservation, and failure isolation.
**No open issues** ð
1 resolved since last review
- 
[Fix script path resolution when --repo-root is relative](https://github.com/microsoft/react-native-windows/pull/16490#discussion_r4307859777)
Review effort: Balanced
### ð¡ Changes recommended
Relative repository paths break nightly feed warming when launching the shared resolver.
1 open issue
- [Fix script path resolution when --repo-root is relative](https://github.com/microsoft/react-native-windows/pull/16490#discussion_r4307859777) · New
What changed in this PR
Replaces nightly library scaffoldingâs `latest` selection with a checked, generator-compatible bootstrap shared by the CLI and feed warmer.
**Changes:**
- Pins and validates matching React Native/template versions.
- Preserves stable versions and nightly dependency rewrites.
- Adds regression coverage and bootstrap documentation.
| File | Description |
| ---- | ----------- |
| vnext/âScripts/âGetReactNativeLibraryScaffoldVersion.js | Adds shared bootstrap validation. |
| vnext/âScripts/âcreaternwlib.cmd | Uses the shared resolver for nightlies. |
| packages/â@rnw-scripts/âwarm-feed/âsrc/âtest/âreactNativeLibraryScaffold.test.ts | Tests resolver and Windows CLI behavior. |
| packages/â@rnw-scripts/âwarm-feed/âsrc/âtest/âcreateReactNativeLibrary.test.ts | Tests warmer integration and failure handling. |
| packages/â@rnw-scripts/âwarm-feed/âsrc/âspecialModules/âcreateReactNativeLibrary.ts | Integrates shared scaffold selection. |
| packages/â@rnw-scripts/âwarm-feed/âREADME.md | Documents bootstrap selection and maintenance. |
| change/âreact-native-windows-6312f66b-0df9-4df7-b9d1-897bb9053c9a.json | Records the prerelease change. |
Review effort: Balanced
Resolved Comment Threads
### ð¡ Changes recommended
Relative repository paths break nightly feed warming when launching the shared resolver.
1 open issue
- [Fix script path resolution when --repo-root is relative](https://github.com/microsoft/react-native-windows/pull/16490#discussion_r4307859777) · New
What changed in this PR
Replaces nightly library scaffoldingâs `latest` selection with a checked, generator-compatible bootstrap shared by the CLI and feed warmer.
**Changes:**
- Pins and validates matching React Native/template versions.
- Preserves stable versions and nightly dependency rewrites.
- Adds regression coverage and bootstrap documentation.
| File | Description |
| ---- | ----------- |
| vnext/âScripts/âGetReactNativeLibraryScaffoldVersion.js | Adds shared bootstrap validation. |
| vnext/âScripts/âcreaternwlib.cmd | Uses the shared resolver for nightlies. |
| packages/â@rnw-scripts/âwarm-feed/âsrc/âtest/âreactNativeLibraryScaffold.test.ts | Tests resolver and Windows CLI behavior. |
| packages/â@rnw-scripts/âwarm-feed/âsrc/âtest/âcreateReactNativeLibrary.test.ts | Tests warmer integration and failure handling. |
| packages/â@rnw-scripts/âwarm-feed/âsrc/âspecialModules/âcreateReactNativeLibrary.ts | Integrates shared scaffold selection. |
| packages/â@rnw-scripts/âwarm-feed/âREADME.md | Documents bootstrap selection and maintenance. |
| change/âreact-native-windows-6312f66b-0df9-4df7-b9d1-897bb9053c9a.json | Records the prerelease change. |
Review effort: Balanced
### ð¢ Approval recommended
The focused changes preserve stable behavior, cover relevant failure paths, and have no identified blocking issues.
**No open issues** ð
Review effort: Balanced