Build and publish JS and TS defaults from one TypeScript source

[bcomnes]

Summary

Maintain one canonical TypeScript default layout, generate its JavaScript counterpart at build time, and publish both formats for language-aware eject.

• Runtime imports the generated JavaScript directly; no runtime stripping or loader hook.
• Eject copies the selected published format using --language js|ts (default js); --yes supports automation.
• TypeScript eject uses public type-only imports.
• Generated JavaScript is checked in and covered by source/output parity tests.

Versioning and packaging

• build:defaults uses the existing esbuild dependency to generate JavaScript from the canonical TypeScript.
• The version hook generates and explicitly stages the JS and version-dependent manifest schema with releasearoni version --add before npm creates the version commit/tag.
• Build generates the JS before runtime-dependent tasks.
• prepack regenerates JS and declarations so npm pack and npm publish include both languages and types.
• Cleanup preserves versioned JS.
• A disposable-repository lifecycle test verifies missing/stale output regeneration, version commits/tags, idempotence, and a clean build → pack → postpublish cycle without versioning the working checkout.

Validation

• All 221 Node tests passed.
• ESLint, TypeScript, installed-dependency checks, full build, and git diff --check passed.
• Packed installation tests verify both eject modes, both layout files, declarations, public imports, and runtime rendering without installed TS source.
• Packed type checks passed with Node typings 22, 24, and 26.
• Version/build lifecycle tests passed.
• Playwright: 11/13 passed; two documentation-navigation timeouts reproduced on unchanged prior commit 4b89976 and were left untouched.

Downstream

Unblocks bcomnes/create-domstack-app#2.
Publish this upstream change first, then update the generator dependency range before releasing create-app.

[coveralls]

Coverage Report for CI Build 35049074263

Warning

Build has drifted: This PR's base is out of sync with its target branch, so coverage data may include unrelated changes.
Quick fix: rebase this PR. Learn more →

Coverage increased (+1.3%) to 96.128%

Details

• Coverage increased (+1.3%) from the base build.
• Patch coverage: 114 of 114 lines across 6 files are fully covered (100%).
• 22 coverage regressions across 4 files.

Uncovered Changes

No uncovered changes found.

Coverage Regressions

22 previously-covered lines in 4 files lost coverage.

File	Lines Losing Coverage	Coverage
index.js	12	96.46%
lib/build-pages/index.js	6	98.44%
lib/build-pages/page-data.js	2	98.07%
lib/build-pages/resolve-vars.js	2	92.19%

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Coverage Stats

Relevant Lines:	10369
Covered Lines:	10098
Line Coverage:	97.39%
Relevant Branches:	3138
Covered Branches:	2886
Branch Coverage:	91.97%
Branches in Coverage %:	Yes
Coverage Strength:	470.21 hits per line

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💛 - Coveralls

[Copilot]

🟡 Changes recommended

The fallback warning still inaccurately refers to root.layout.js instead of the canonical TypeScript layout.

Get a fresh assessment by requesting another Copilot review.

Pull request overview

This PR makes the bundled TypeScript layout canonical and adds language-aware, non-interactive layout ejection.

Changes:

• Adds scoped TypeScript loading and packages the canonical layout.
• Adds --language js|ts and --yes ejection options.
• Updates runtime discovery, documentation, and validation tests.

File summaries

File	Summary
test-cases/cli-errors/eject.test.js	Tests ejection formats, prompts, and validation.
scripts/test-packed-types.js	Validates packed layouts and generated TypeScript consumers.
package.json	Packages the canonical TypeScript layout.
lib/identify-pages.js	Discovers the TypeScript fallback layout; warning text still references root.layout.js.
lib/defaults/load-layout.js	Loads the packaged TypeScript layout with scoped stripping.
lib/defaults/default.root.layout.ts	Defines the canonical typed layout.
lib/defaults/default.root.layout.test.js	Tests the canonical layout directly.
lib/build-pages/page-data.js	Uses the specialized layout loader.
docs/layouts/README.md	Documents layout loading and ejection.
docs/cli/README.md	Documents ejection options and formats.
bin.js	Implements language-aware ejection and confirmation bypass.

Review details

• Files reviewed: 11/11 changed files
• Comments generated: 1
• Review effort level: Lite

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