fix(nuxt): make pageMeta ast undefineable in transformation

[huang-julien]

🔗 Linked issue

fix #26377

❓ Type of change

• 📖 Documentation (updates to the documentation, readme or JSdoc annotations)
• 🐞 Bug fix (a non-breaking change that fixes an issue)
• 👌 Enhancement (improving an existing functionality like performance)
• ✨ New feature (a non-breaking change that adds functionality)
• 🧹 Chore (updates to the build process or auxiliary tools and libraries)
• ⚠️ Breaking change (fix or feature that would cause existing functionality to change)

📚 Description

Hi 👋 this PR makes the meta AST undefineable in the transform plugin.

📝 Checklist

• I have linked an issue or discussion.
• I have added tests (if possible).
• I have updated the documentation accordingly.

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[danielroe]

This plugin should already be doing it:

nuxt/packages/nuxt/src/core/plugins/tree-shake.ts

Lines 29 to 46 in ff1bb56

	transform (code) {
	if (!COMPOSABLE_RE.test(code)) { return }
	const s = new MagicString(code)
	const strippedCode = stripLiteral(code)
	for (const match of strippedCode.matchAll(COMPOSABLE_RE_GLOBAL)) {
	s.overwrite(match.index!, match.index! + match[0].length, `${match[1]} false && /*@__PURE__*/ ${match[2]}`)
	}
	if (s.hasChanged()) {
	return {
	code: s.toString(),
	map: options.sourcemap
	? s.generateMap({ hires: true })
	: undefined
	}
	}
	}

It would be worth investigating why it is not in this case.