Fix false TS1006 for included tsconfig JSON imports (#4279)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: jakebailey <5341706+jakebailey@users.noreply.github.com>

Author: Copilot

internal/compiler/fileloader.go

@@ -206,7 +206,7 @@ func (p *fileLoader) addRootFileTask(fileName string, libFile *LibFile, includeR
 	if p.opts.Config.ConfigFile != nil {
 		containingFile = tspath.GetNormalizedAbsolutePath(p.opts.Config.ConfigFile.SourceFile.FileName(), currDir)
 	}
-	resolvedFile, diagnostic := p.getSourceFileFromReference(absPath, fileName, containingFile)
+	resolvedFile, diagnostic := p.getSourceFileFromReference(absPath, fileName, containingFile, includeReason)
 	rootTask := &parseTask{
 		normalizedFilePath: resolvedFile,
 		libFile:            libFile,
@@ -388,6 +388,7 @@ func (p *fileLoader) getSourceFileFromReference(
 	fileName string,
 	referenceText string,
 	containingFile string,
+	includeReason *FileIncludeReason,
 ) (string, *sourceFileFromReferenceDiagnostic) {
 	options := p.opts.Config.CompilerOptions()
 	allowNonTsExtensions := options.AllowNonTsExtensions.IsTrue()
@@ -406,7 +407,7 @@ func (p *fileLoader) getSourceFileFromReference(
 			return "", &sourceFileFromReferenceDiagnostic{message: diagnostics.File_0_not_found, args: []any{diagnosticFileName}}
 		}
 
-		if tspath.GetCanonicalFileName(containingFile, p.opts.Host.FS().UseCaseSensitiveFileNames()) == canonicalFileName {
+		if includeReason.isReferencedFile() && tspath.GetCanonicalFileName(containingFile, p.opts.Host.FS().UseCaseSensitiveFileNames()) == canonicalFileName {
 			return "", &sourceFileFromReferenceDiagnostic{message: diagnostics.A_file_cannot_have_a_reference_to_itself}
 		}
 		return fileName, nil
@@ -450,6 +451,7 @@ func (p *fileLoader) resolveTripleslashPathReference(moduleName string, containi
 		normalizedFileName,
 		moduleName,
 		containingFile,
+		includeReason,
 	)
 	if diagnostic != nil {
 		return nil, &processingDiagnostic{

internal/execute/tsctests/tscbuild_test.go

@@ -144,6 +144,31 @@ func TestBuildCommandLine(t *testing.T) {
 	}
 	testCases := slices.Concat(
 		[]*tscInput{
+			{
+				subScenario: "included tsconfig json can be imported as json input",
+				files: FileMap{
+					"/home/src/workspaces/project/index.ts": `import tsconfig from "./tsconfig.json" with { type: "json" };
+declare global {
+    interface ImportAttributes {
+        type: "json";
+    }
+}
+console.log(tsconfig);`,
+					"/home/src/workspaces/project/tsconfig.json": stringtestutil.Dedent(`
+					{
+						"compilerOptions": {
+							"module": "preserve",
+							"moduleResolution": "bundler",
+							"noEmit": true,
+							"resolveJsonModule": true,
+							"strict": true,
+							"target": "esnext"
+						},
+						"include": ["index.ts", "tsconfig.json"]
+					}`),
+				},
+				commandLineArgs: []string{"--build"},
+			},
 			{
 				subScenario:     "help",
 				files:           FileMap{},

testdata/baselines/reference/tsbuild/commandLine/included-tsconfig-json-can-be-imported-as-json-input.js

@@ -0,0 +1,78 @@
+currentDirectory::/home/src/workspaces/project
+useCaseSensitiveFileNames::true
+Input::
+//// [/home/src/workspaces/project/index.ts] *new* 
+import tsconfig from "./tsconfig.json" with { type: "json" };
+declare global {
+    interface ImportAttributes {
+        type: "json";
+    }
+}
+console.log(tsconfig);
+//// [/home/src/workspaces/project/tsconfig.json] *new* 
+{
+    "compilerOptions": {
+        "module": "preserve",
+        "moduleResolution": "bundler",
+        "noEmit": true,
+        "resolveJsonModule": true,
+        "strict": true,
+        "target": "esnext"
+    },
+    "include": ["index.ts", "tsconfig.json"]
+}
+
+tsgo --build
+ExitStatus:: Success
+Output::
+//// [/home/src/tslibs/TS/Lib/lib.esnext.full.d.ts] *Lib*
+/// <reference no-default-lib="true"/>
+interface Boolean {}
+interface Function {}
+interface CallableFunction {}
+interface NewableFunction {}
+interface IArguments {}
+interface Number { toExponential: any; }
+interface Object {}
+interface RegExp {}
+interface String { charAt: any; }
+interface Array<T> { length: number; [n: number]: T; }
+interface ReadonlyArray<T> {}
+interface SymbolConstructor {
+    (desc?: string | number): symbol;
+    for(name: string): symbol;
+    readonly toStringTag: symbol;
+}
+declare var Symbol: SymbolConstructor;
+interface Symbol {
+    readonly [Symbol.toStringTag]: string;
+}
+declare const console: { log(msg: any): void; };
+//// [/home/src/workspaces/project/tsconfig.tsbuildinfo] *new* 
+{"version":"FakeTSVersion","root":["./index.ts","./tsconfig.json"]}
+//// [/home/src/workspaces/project/tsconfig.tsbuildinfo.readable.baseline.txt] *new* 
+{
+  "version": "FakeTSVersion",
+  "root": [
+    {
+      "files": [
+        "./index.ts"
+      ],
+      "original": "./index.ts"
+    },
+    {
+      "files": [
+        "./tsconfig.json"
+      ],
+      "original": "./tsconfig.json"
+    }
+  ],
+  "size": 67
+}
+
+tsconfig.json::
+SemanticDiagnostics::
+*refresh*    /home/src/tslibs/TS/Lib/lib.esnext.full.d.ts
+*refresh*    /home/src/workspaces/project/tsconfig.json
+*refresh*    /home/src/workspaces/project/index.ts
+Signatures::