Test output not found built error

Author: sheetalkamat

internal/compiler/host.go

@@ -91,7 +91,10 @@ func (h *compilerHost) Trace(msg string) {
 }
 
 func (h *compilerHost) GetSourceFile(fileName string, path tspath.Path, languageVersion core.ScriptTarget) *ast.SourceFile {
-	text, _ := h.FS().ReadFile(fileName)
+	text, ok := h.FS().ReadFile(fileName)
+	if !ok {
+		return nil
+	}
 	if tspath.FileExtensionIs(fileName, tspath.ExtensionJson) {
 		return parser.ParseJSONText(fileName, path, text)
 	}

internal/compiler/program.go

@@ -244,7 +244,8 @@ func (p *Program) initCheckerPool() {
 }
 
 func canReplaceFileInProgram(file1 *ast.SourceFile, file2 *ast.SourceFile) bool {
-	return file1.FileName() == file2.FileName() &&
+	return file2 != nil &&
+		file1.FileName() == file2.FileName() &&
 		file1.Path() == file2.Path() &&
 		file1.LanguageVersion == file2.LanguageVersion &&
 		file1.LanguageVariant == file2.LanguageVariant &&

internal/execute/tscprojectreferences_test.go

@@ -51,6 +51,24 @@ func TestProjectReferences(t *testing.T) {
 	"references": [
 		{ "path": "../utils" },
 	],
+}`,
+			}, "/home/src/workspaces/solution"),
+			commandLineArgs: []string{"--p", "project"},
+		},
+		{
+			subScenario: "when project reference is not built",
+			sys: newTestSys(FileMap{
+				"/home/src/workspaces/solution/utils/index.ts": "export const x = 10;",
+				"/home/src/workspaces/solution/utils/tsconfig.json": `{
+	"compilerOptions": {
+		"composite": true,
+	},
+}`,
+				"/home/src/workspaces/solution/project/index.ts": `import { x } from "../utils";`,
+				"/home/src/workspaces/solution/project/tsconfig.json": `{
+	"references": [
+		{ "path": "../utils" },
+	],
 }`,
 			}, "/home/src/workspaces/solution"),
 			commandLineArgs: []string{"--p", "project"},

testdata/baselines/reference/tsc/projectReferences/when-project-reference-is-not-built.js

@@ -0,0 +1,44 @@
+
+currentDirectory::/home/src/workspaces/solution
+useCaseSensitiveFileNames::true
+Input::--p project
+//// [/home/src/workspaces/solution/project/index.ts] new file
+import { x } from "../utils";
+//// [/home/src/workspaces/solution/project/tsconfig.json] new file
+{
+	"references": [
+		{ "path": "../utils" },
+	],
+}
+//// [/home/src/workspaces/solution/utils/index.ts] new file
+export const x = 10;
+//// [/home/src/workspaces/solution/utils/tsconfig.json] new file
+{
+	"compilerOptions": {
+		"composite": true,
+	},
+}
+
+ExitStatus:: 2
+
+CompilerOptions::{
+    "project": "/home/src/workspaces/solution/project"
+}
+Output::
+project/index.ts:1:19 - error TS6305: Output file '/home/src/workspaces/solution/utils/index.d.ts' has not been built from source file '/home/src/workspaces/solution/utils/index.ts'.
+
+1 import { x } from "../utils";
+                    ~~~~~~~~~~
+
+
+Found 1 error in project/index.ts:1
+
+//// [/home/src/workspaces/solution/project/index.js] new file
+"use strict";
+Object.defineProperty(exports, "__esModule", { value: true });
+
+//// [/home/src/workspaces/solution/project/index.ts] no change
+//// [/home/src/workspaces/solution/project/tsconfig.json] no change
+//// [/home/src/workspaces/solution/utils/index.ts] no change
+//// [/home/src/workspaces/solution/utils/tsconfig.json] no change
+