Fix --showConfig to include files field

[Copilot]

tsgo --showConfig omits the files field from output while tsc --showConfig includes all resolved files.

Root cause: matchesSpecs in showconfig.go used the config file's directory as the base path for glob matching, causing include patterns like **/* to correctly match source files and filter them all out. TypeScript's convertToTSConfig has a bug where it passes the config file path (including tsconfig.json filename) to getFileMatcherPatterns, producing patterns that never match actual source files—so all resolved files pass through to the output.

Fix:

• Removed the matchesSpecs function entirely rather than porting TypeScript's buggy filtering logic
• Removed the vfsmatch import (no longer needed)
• Simplified the file list building to just include all resolved files directly as relative paths, making the intent obvious:

  // Build the list of all resolved files as relative paths from the config file.
  var files []string
  for _, f := range configParseResult.FileNames() {
      normalizedFilePath := tspath.GetNormalizedAbsolutePath(f, configParseResult.GetCurrentDirectory())
      relativePath := tspath.GetRelativePathFromFile(normalizedConfigPath, normalizedFilePath, comparePathsOptions)
      files = append(files, relativePath)
  }

• Handled the empty configFileName case (e.g., tsgo --showConfig file0.ts with no tsconfig loaded) by defaulting to "tsconfig.json", so path relativization works correctly from the current directory instead of its parent
• Added test case reproducing the reported scenario (tsconfig with outDir + exclude, no explicit files/include)
• Updated 9 affected baselines that now correctly include the files field

[jakebailey]

@copilot Rather than port the buggy code to maintain this behavior, just implement it from scratch in a way that makes it obvious that we are just sticking everything in here.

[Copilot]

Simplified in b66ec50 — removed matchesSpecs entirely and just include all resolved files directly. No more porting the buggy filter logic.

[Copilot]

Pull request overview

This PR fixes tsgo --showConfig so it includes the files field (listing resolved root files) in cases where tsc --showConfig does, aligning tsgo output with TypeScript’s behavior.

Changes:

• Removed include/exclude-based filtering when constructing the files list; --showConfig now emits all resolved files.
• Added a regression test covering outDir + exclude with no explicit files/include.
• Updated/added showConfig baselines to reflect the newly-present files field.

Reviewed changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
internal/tsoptions/showconfig.go	Always emits files as all resolved root files (relative paths), removing prior filtering logic and dependency on vfsmatch.
internal/execute/tsctests/showconfig_test.go	Adds a new --showConfig test scenario for exclude + outDir.
testdata/baselines/reference/tsc/showConfig/Show-TSConfig-with-transitively-implied-options.js	Baseline updated to include files.
testdata/baselines/reference/tsc/showConfig/Show-TSConfig-with-references.js	Baseline updated to include files.
testdata/baselines/reference/tsc/showConfig/Show-TSConfig-with-paths-and-more.js	Baseline updated to include files.
testdata/baselines/reference/tsc/showConfig/Show-TSConfig-with-include-filtering-files.js	Baseline updated to include files.
testdata/baselines/reference/tsc/showConfig/Show-TSConfig-with-files-and-include.js	Baseline updated to include files (now includes resolved included files too).
testdata/baselines/reference/tsc/showConfig/Show-TSConfig-with-exclude.js	Baseline updated to include files.
testdata/baselines/reference/tsc/showConfig/Show-TSConfig-with-exclude-and-outDir.js	New baseline for the added regression test scenario.
testdata/baselines/reference/tsc/showConfig/Show-TSConfig-with-compileOnSave-and-more.js	Baseline updated to include files.

Comments suppressed due to low confidence (1)

internal/tsoptions/showconfig.go:77

• Minor perf: files grows via append without a capacity hint. Since configParseResult.FileNames() is already available, consider preallocating files with make([]string, 0, len(...)) to avoid repeated reallocations for large projects.

	var files []string
	for _, f := range configParseResult.FileNames() {
		normalizedFilePath := tspath.GetNormalizedAbsolutePath(f, configParseResult.GetCurrentDirectory())
		relativePath := tspath.GetRelativePathFromFile(normalizedConfigPath, normalizedFilePath, comparePathsOptions)
		files = append(files, relativePath)
	}