fix(pack): disable ts_transform for foreign_code

[fireairforce]

Summary

PR: #2237 为了处理 node_modules 中的 alias 给 foreign_code 开启了 enable_typescript 配置，turbopack 在开启这个配置后处理 node_modules 中的依赖时会去解析对应的 tsconfig.json 文件(做 typescript transform  用)，但实际上很多 npm 包 tsconfig file 中的依赖是 devDependencies，这会导致 resolve errror，参考:

之前 alias 这个问题的时候，本质上还是从 extensions 的角度来处理，这里默认给 foreign_code 的 extensions 打开更多的后缀即可。

Test Plan

旧的快照测试不变，新增了 node_modules/tsconfig-mod/tsconfig.json 相关的测试 case.

[gemini-code-assist]

Summary of Changes

Hello @fireairforce, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request addresses a critical build failure in Turbopack where enabling TypeScript transformation for external modules (e.g., node_modules) inadvertently caused resolution errors due to the parsing of tsconfig.json files within those packages. The solution involves a refined module resolution strategy that explicitly defines allowed file extensions for foreign code, effectively preventing Turbopack from attempting to process tsconfig.json files in third-party dependencies and ensuring a more stable build process.

Highlights

• Resolving tsconfig.json issues in node_modules: Previously, enabling TypeScript transformation for foreign_code (like node_modules) caused Turbopack to attempt parsing tsconfig.json files within npm packages. This often led to resolution errors because these tsconfig.json files might reference devDependencies or have configurations not intended for runtime resolution.
• Disabling ts_transform for foreign_code: The core fix involves explicitly defining custom_extensions for foreign_code resolution, rather than relying on enable_typescript to implicitly handle tsconfig.json parsing. This ensures that node_modules are resolved based on their file extensions, bypassing potentially problematic tsconfig.json configurations.
• Refined module resolution strategy: The change refactors the ResolveOptionsContext to separate default options from foreign_code specific options, allowing for more precise control over how external modules are processed without causing unintended side effects.
• Enhanced test coverage: New snapshot test cases have been added, specifically targeting scenarios involving node_modules with tsconfig.json files that previously caused errors, ensuring the fix is robust and prevents regressions.

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[gemini-code-assist]

Code Review

这个 PR 的目标是修复在处理 node_modules 中的依赖时，因解析其中的 tsconfig.json 文件而导致的 resolve error。通过为 foreign_code（即 node_modules 中的代码）禁用 enable_typescript 选项，并手动提供文件扩展名列表，这个修改有效地解决了问题。新增的测试用例也很好地覆盖了修复的场景。整体来看，这是一个不错的修复。我有一个关于代码可维护性的建议。