fix: handle optional CSS loader options

[SoonIter]

Summary

• type the copied CSS loader options through rspack-chain generic loader options
• skip rules without configured CSS loader options
• restore compatibility with the stricter rspack-chain getter types exposed by Rsbuild

Validation

• pnpm lint
• pnpm check
• pnpm build
• pnpm test (10 passed)

Related: web-infra-dev/rsbuild#8437

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-07T09:18:34.923073Z	ad3fff1	PR opened

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[Copilot]

🟢 Approval recommended

The change is small, locally contained, and correctly guards missing CSS loader options without introducing observable behavior regressions.

Pull request overview

This PR updates rsbuild-plugin-typed-css-modules to better handle cases where the CSS loader has no configured options, while keeping compatibility with stricter rspack-chain typing exposed by Rsbuild.

Changes:

• Type the CSS loader usage via rule.use<CSSLoaderOptions>(...) to align with the chain’s generic loader option typing.
• Treat missing CSS loader options as a “skip this rule” case by guarding access to modules with optional chaining.

File summaries

File	Description
src/index.ts	Makes CSS loader option retrieval safer/typed and skips rules when CSS loader options (or modules) are not configured.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 0
• Review effort level: Lite

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