feat: track tsconfig files as dependencies

[stormslowly]

Summary

• Track tsconfig files loaded for paths resolution as file dependencies.
• Propagate config file dependencies through extended tsconfigs and project references.
• Add a regression test covering tsconfig, extends, and referenced config files in ResolveContext.file_dependencies.

Why

When tsconfig paths resolution was enabled, the resolver loaded tsconfig.json files through a separate context, so those config files were not reported as file dependencies. This diverged from enhanced-resolve and could miss invalidation when tsconfig files changed.

Validation

• cargo fmt --check
• cargo test tsconfig --lib
• cargo test --lib -- --skip tests::pnp

Note: full cargo test --lib still fails in this checkout because PnP fixtures do not include .pnp.* files; non-PnP lib tests pass.

[codspeed-hq]

Merging this PR will improve performance by 31.19%

⚡ 1 improved benchmark
✅ 11 untouched benchmarks

Performance Changes

	Mode	Benchmark	BASE	HEAD	Efficiency
⚡	Memory	resolver[resolve from symlinks multi thread]	730.3 KB	556.6 KB	+31.19%

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_{Comparing codex/tsconfig-file-dependencies (5816483) with main (e5cbe7d)}

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

This PR improves dependency tracking for TypeScript tsconfig-based path resolution by ensuring tsconfig files involved in resolution (including extends and project references) are surfaced in ResolveContext.file_dependencies, aligning behavior more closely with enhanced-resolve.

Changes:

• Add file_dependencies tracking to TsConfig and propagate it through extends merges.
• Plumb the main resolve context through tsconfig-paths resolution and add collected tsconfig dependencies into the resolve context.
• Add a regression test asserting tsconfig/extends/referenced configs appear in ResolveContext.file_dependencies.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

File	Description
src/tsconfig.rs	Introduces TsConfig.file_dependencies and propagates it when extending configs.
src/lib.rs	Ensures tsconfig-paths uses the caller context and records tsconfig-derived file dependencies into ResolveContext.
src/tests/tsconfig_project_references.rs	Adds regression coverage for reporting tsconfig-related dependencies in ResolveContext.file_dependencies.

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