Ignore timestamp update errors like in strada

internal/diagnostics/extraDiagnosticMessages.json

@@ -35,10 +35,6 @@
         "category": "Message",
         "code": 6420
     },
-    "Failed to update timestamp of file '{0}'.": {
-        "category": "Message",
-        "code": 5074
-    },
     "Project '{0}' is out of date because it has errors.": {
         "category": "Message",
         "code": 6423

internal/execute/build/buildtask.go

@@ -661,16 +661,16 @@ func (t *buildTask) updateTimeStamps(orchestrator *Orchestrator, emittedFiles []
 			verboseMessageReported = true
 		}
 		err := orchestrator.host.SetMTime(file, now)
-		if err != nil {
-			t.reportDiagnostic(ast.NewCompilerDiagnostic(diagnostics.Failed_to_update_timestamp_of_file_0, file))
-		} else if file == buildInfoName {
-			t.buildInfoEntryMu.Lock()
-			if t.buildInfoEntry != nil {
-				t.buildInfoEntry.mTime = now
+		if err == nil {
+			if file == buildInfoName {
+				t.buildInfoEntryMu.Lock()
+				if t.buildInfoEntry != nil {
+					t.buildInfoEntry.mTime = now
+				}
+				t.buildInfoEntryMu.Unlock()
+			} else if t.storeOutputTimeStamp(orchestrator) {
+				orchestrator.host.storeMTime(file, now)
 			}
-			t.buildInfoEntryMu.Unlock()
-		} else if t.storeOutputTimeStamp(orchestrator) {
-			orchestrator.host.storeMTime(file, now)
 		}
 	}
 

internal/execute/tsctests/tscbuild_test.go

@@ -2062,6 +2062,65 @@ func TestBuildProgramUpdates(t *testing.T) {
 			cwd:             "/user/username/projects/project",
 			commandLineArgs: []string{"--b", "-i", "-w"},
 		},
+		{
+			subScenario: "when root is source from project reference",
+			files: FileMap{
+				"/home/src/workspaces/project/lib/tsconfig.json": stringtestutil.Dedent(`
+					{
+						"compilerOptions": {
+							"composite": true,
+							"outDir": "./dist"
+						}
+					}`),
+				"/home/src/workspaces/project/lib/foo.ts": `export const FOO: string = 'THEFOOEXPORT';`,
+				"/home/src/workspaces/project/tsconfig.json": stringtestutil.Dedent(`
+					{
+						"references": [ { "path": "./lib" } ]
+					}`),
+				"/home/src/workspaces/project/index.ts": `import { FOO } from "./lib/foo";`,
+			},
+			commandLineArgs: []string{"--b"},
+			edits: []*tscEdit{
+				{
+					caption: "dts doesnt change",
+					edit: func(sys *testSys) {
+						sys.appendFile("/home/src/workspaces/project/lib/foo.ts", "const Bar = 10;")
+					},
+				},
+			},
+			cwd: "/home/src/workspaces/project",
+		},
+		{
+			subScenario: "when root is source from project reference with composite",
+			files: FileMap{
+				"/home/src/workspaces/project/lib/tsconfig.json": stringtestutil.Dedent(`
+					{
+						"compilerOptions": {
+							"composite": true,
+							"outDir": "./dist"
+						}
+					}`),
+				"/home/src/workspaces/project/lib/foo.ts": `export const FOO: string = 'THEFOOEXPORT';`,
+				"/home/src/workspaces/project/tsconfig.json": stringtestutil.Dedent(`
+					{
+						"compilerOptions": {
+							"composite": true,
+						},
+						"references": [ { "path": "./lib" } ]
+					}`),
+				"/home/src/workspaces/project/index.ts": `import { FOO } from "./lib/foo";`,
+			},
+			commandLineArgs: []string{"--b"},
+			edits: []*tscEdit{
+				{
+					caption: "dts doesnt change",
+					edit: func(sys *testSys) {
+						sys.appendFile("/home/src/workspaces/project/lib/foo.ts", "const Bar = 10;")
+					},
+				},
+			},
+			cwd: "/home/src/workspaces/project",
+		},
 	}
 	for _, test := range testCases {
 		test.run(t, "programUpdates")