Disable ATA when no user cache is available

tsc/cmd/tsc/lsp.go

@@ -57,7 +57,7 @@ func runLSP(args []string) int {
 		Cwd:                cwd,
 		FS:                 fs,
 		DefaultLibraryPath: defaultLibraryPath,
-		TypingsLocation:    tspath.ToRootedDirectoryPath(typingsLocation, cwd),
+		TypingsLocation:    typingsLocation,
 		NpmInstall: func(ctx context.Context, cwd string, args []string) ([]byte, error) {
 			cmd := exec.CommandContext(ctx, "npm", args...)
 			cmd.Dir = cwd

tsc/internal/lsp/replay_test.go

@@ -58,7 +58,7 @@ func TestReplay(t *testing.T) {
 		Cwd:                cwd,
 		FS:                 fs,
 		DefaultLibraryPath: defaultLibraryPath,
-		TypingsLocation:    tspath.ToRootedDirectoryPath(typingsLocation, cwd),
+		TypingsLocation:    typingsLocation,
 		NpmInstall: func(ctx context.Context, cwd string, args []string) ([]byte, error) {
 			cmd := exec.CommandContext(ctx, "npm", args...)
 			cmd.Dir = cwd

tsc/internal/project/ata/ata_test.go

@@ -10,6 +10,7 @@ import (
 	"github.com/microsoft/TypeScript/tsc/internal/lsp/lsproto"
 	"github.com/microsoft/TypeScript/tsc/internal/project"
 	"github.com/microsoft/TypeScript/tsc/internal/testutil/projecttestutil"
+	"github.com/microsoft/TypeScript/tsc/internal/tspath"
 	"gotest.tools/v3/assert"
 )
 
@@ -19,6 +20,36 @@ func TestATA(t *testing.T) {
 		t.Skip("bundled files are not embedded")
 	}
 
+	t.Run("no typings cache disables acquisition", func(t *testing.T) {
+		t.Parallel()
+
+		files := map[string]any{
+			"/user/username/projects/project/app.js": `const $ = require("jquery");`,
+			"/user/username/projects/project/jsconfig.json": `{
+				"typeAcquisition": { "enable": true }
+			}`,
+		}
+		session, utils := projecttestutil.SetupWithOptionsAndTypingsInstaller(files, &project.SessionOptions{
+			CurrentDirectory:   tspath.RootedDirectoryPathFromNormalized("/"),
+			DefaultLibraryPath: bundled.LibPath(),
+			WatchEnabled:       true,
+		}, &projecttestutil.TypingsInstallerOptions{
+			PackageToFile: map[string]string{
+				"jquery": `export const x: number;`,
+			},
+		})
+
+		uri := lsproto.DocumentUri("file:///user/username/projects/project/app.js")
+		session.DidOpenFile(context.Background(), uri, 1, files["/user/username/projects/project/app.js"].(string), lsproto.LanguageKindJavaScript)
+		session.WaitForBackgroundTasks()
+
+		ls, err := session.GetLanguageService(context.Background(), uri)
+		assert.NilError(t, err)
+		assert.Assert(t, ls.GetProgram().GetSourceFile("/user/username/projects/project/app.js") != nil)
+		assert.Equal(t, len(utils.NpmExecutor().NpmInstallCalls()), 0)
+		assert.Assert(t, !session.FS().FileExists(projecttestutil.TestTypingsDirectory.ResolveFile("package.json")))
+	})
+
 	t.Run("local module should not be picked up", func(t *testing.T) {
 		t.Parallel()
 		files := map[string]any{

tsc/internal/vfs/osvfs/os.go

@@ -188,10 +188,14 @@ func (vfs *osFS) Chtimes(path tspath.RootedPath, aTime time.Time, mTime time.Tim
 	return os.Chtimes(path.AsString(), aTime, mTime)
 }
 
-func GetGlobalTypingsCacheLocation() string {
+func GetGlobalTypingsCacheLocation() tspath.RootedDirectoryPath {
 	cacheDir, err := os.UserCacheDir()
 	if err != nil {
-		cacheDir = os.TempDir()
+		return ""
+	}
+	cachePath, ok := tspath.TryRootedPathFromAbsolute(cacheDir)
+	if !ok {
+		return ""
 	}
 
 	var subdir string
@@ -200,5 +204,5 @@ func GetGlobalTypingsCacheLocation() string {
 	} else {
 		subdir = "typescript"
 	}
-	return tspath.CombinePaths(cacheDir, subdir, core.VersionMajorMinor())
+	return tspath.RootedDirectoryPathFromPath(cachePath).ResolveDirectory(subdir).ResolveDirectory(core.VersionMajorMinor())
 }

tsc/internal/vfs/osvfs/os_test.go

@@ -7,12 +7,55 @@ import (
 	"strings"
 	"testing"
 
+	"github.com/microsoft/TypeScript/tsc/internal/core"
 	"github.com/microsoft/TypeScript/tsc/internal/repo"
 	"github.com/microsoft/TypeScript/tsc/internal/tspath"
 	"github.com/microsoft/TypeScript/tsc/internal/vfs/osvfs"
 	"gotest.tools/v3/assert"
 )
 
+func TestGetGlobalTypingsCacheLocation(t *testing.T) {
+	t.Run("user cache", func(t *testing.T) {
+		cacheRoot := t.TempDir()
+		t.Setenv("HOME", cacheRoot)
+		t.Setenv("home", cacheRoot)
+		t.Setenv("LocalAppData", cacheRoot)
+		t.Setenv("XDG_CACHE_HOME", cacheRoot)
+		cacheDir, err := os.UserCacheDir()
+		assert.NilError(t, err)
+
+		subdir := "typescript"
+		if runtime.GOOS == "windows" {
+			subdir = "Microsoft/TypeScript"
+		}
+		assert.Equal(t, osvfs.GetGlobalTypingsCacheLocation(), tspath.RootedDirectoryPathFromAbsolute(tspath.CombinePaths(cacheDir, subdir, core.VersionMajorMinor())))
+	})
+
+	t.Run("missing user cache", func(t *testing.T) {
+		for _, name := range []string{"HOME", "home", "LocalAppData", "XDG_CACHE_HOME"} {
+			t.Setenv(name, "")
+		}
+		assert.Equal(t, osvfs.GetGlobalTypingsCacheLocation(), tspath.RootedDirectoryPath(""))
+	})
+
+	t.Run("relative XDG cache", func(t *testing.T) {
+		switch runtime.GOOS {
+		case "windows", "darwin", "ios", "plan9":
+			t.Skip("XDG_CACHE_HOME is not used on this platform")
+		}
+		t.Setenv("XDG_CACHE_HOME", "relative")
+		assert.Equal(t, osvfs.GetGlobalTypingsCacheLocation(), tspath.RootedDirectoryPath(""))
+	})
+
+	t.Run("relative user cache", func(t *testing.T) {
+		t.Setenv("XDG_CACHE_HOME", "")
+		for _, name := range []string{"HOME", "home", "LocalAppData"} {
+			t.Setenv(name, "relative-home")
+		}
+		assert.Equal(t, osvfs.GetGlobalTypingsCacheLocation(), tspath.RootedDirectoryPath(""))
+	})
+}
+
 func TestOS(t *testing.T) {
 	t.Parallel()