feat(core): accept loadConfig result as config input

[chenjiahan]

Motivation

Rslib relies on private configuration metadata to preserve file watching and cache dependencies. Rsbuild now supports passing the complete load result directly (rsbuild#8147).

Changes

Allow createRslib to accept a complete loadConfig result, directly or through an async factory, and forward its file path and dependencies alongside the transformed Rsbuild configuration.

Preserve Rsbuild's loaded configuration, including _privateMeta, while removing Rslib's explicit forwarding of that private field.

Update the CLI, test helper, and API documentation to pass complete results; callers passing only result.content must migrate to preserve configuration watching and cache dependencies.

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[chatgpt-codex-connector]

Codex Review Summary

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-10T02:47:48.953234Z	c16d029	Draft marked ready

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[Copilot]

🟡 Changes recommended

The new isLoadConfigResult runtime guard is too permissive and can misclassify user configs, leading to incorrect config handling.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

This PR updates @rslib/core to let createRslib accept the full loadConfig result (or an async factory returning it), so Rslib can forward config file path + dependency metadata to Rsbuild for better file watching and persistent cache invalidation, without manually forwarding _privateMeta.

Changes:

• Extend CreateRslibOptions.config to accept LoadConfigResult (and async factories returning it), and forward the load result metadata into createRsbuild.
• Align loadConfig types/behavior with Rsbuild’s LoadConfigResult shape (including dependencies) and update CLI + test helpers to pass the full result.
• Update API docs (EN/ZH) and add a unit test covering the “pass full loadConfig result” path.

File summaries

File	Description
website/docs/zh/api/javascript-api/core.mdx	Documents createRslib accepting LoadConfigResult and explains why callers should pass full results.
website/docs/en/api/javascript-api/core.mdx	Same as above for English docs.
tests/scripts/shared.ts	Updates test helper to pass full loadConfig() result into createRslib.
packages/core/tests/config.test.ts	Adds test asserting Rsbuild receives config file path/dependencies when given full load result.
packages/core/src/types/rslib.ts	Broadens CreateRslibOptions.config type to include LoadConfigResult.
packages/core/src/loadConfig.ts	Re-exports Rsbuild’s LoadConfigResult shape and returns it directly from loadConfig.
packages/core/src/createRslib.ts	Detects LoadConfigResult inputs and forwards metadata to createRsbuild.
packages/core/src/cli/init.ts	Ensures CLI passes the complete load result (not just content) into createRslib.

Review details

• Files reviewed: 8/8 changed files
• Comments generated: 1
• Review effort level: Lite

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