Fix panic on CLI --typeRoots with relative path (#3866)

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/tsoptions/commandlineparser_test.go

@@ -87,6 +87,22 @@ func TestCommandLineParseResult(t *testing.T) {
 	}
 }
 
+func TestParseCommandLineTypeRootsRelativePath(t *testing.T) {
+	t.Parallel()
+
+	host := tsoptionstest.NewVFSParseConfigHost(map[string]string{
+		"/home/project/bug.ts": `let x = 1;`,
+	}, "/home/project", true)
+
+	cmdLine := tsoptions.ParseCommandLine([]string{"--typeRoots", "t", "bug.ts"}, host)
+
+	typeRoots := cmdLine.CompilerOptions().TypeRoots
+	assert.Assert(t, typeRoots != nil, "typeRoots should not be nil")
+	assert.Equal(t, len(typeRoots), 1)
+	assert.Assert(t, tspath.IsRootedDiskPath(typeRoots[0]), "typeRoots entry should be an absolute path, got: %s", typeRoots[0])
+	assert.Assert(t, strings.HasSuffix(typeRoots[0], "/t"), "typeRoots entry should end with '/t', got: %s", typeRoots[0])
+}
+
 func TestCustomConditionsNullOverride(t *testing.T) {
 	t.Parallel()
 

internal/tsoptions/parsinghelpers.go

@@ -642,6 +642,14 @@ func ConvertOptionToAbsolutePath(o string, v any, optionMap CommandLineOptionNam
 					return tspath.GetNormalizedAbsolutePath(item, cwd)
 				}), true
 			}
+			if arr, ok := v.([]any); ok {
+				return core.Map(arr, func(item any) any {
+					if s, isStr := item.(string); isStr {
+						return tspath.GetNormalizedAbsolutePath(s, cwd)
+					}
+					return item
+				}), true
+			}
 		}
 	} else if option.IsFilePath {
 		if value, ok := v.(string); ok {

testdata/baselines/reference/compiler/typeRootsRelativePath.errors.txt

@@ -0,0 +1,11 @@
+error TS2688: Cannot find type definition file for 'n'.
+  The file is in the program because:
+    Entry point of type library 'n' specified in compilerOptions
+
+
+!!! error TS2688: Cannot find type definition file for 'n'.
+!!! error TS2688:   The file is in the program because:
+!!! error TS2688:     Entry point of type library 'n' specified in compilerOptions
+==== typeRootsRelativePath.ts (0 errors) ====
+    let x = 1;
+    

testdata/baselines/reference/compiler/typeRootsRelativePath.symbols

@@ -0,0 +1,6 @@
+//// [tests/cases/compiler/typeRootsRelativePath.ts] ////
+
+=== typeRootsRelativePath.ts ===
+let x = 1;
+>x : Symbol(x, Decl(typeRootsRelativePath.ts, 0, 3))
+

testdata/baselines/reference/compiler/typeRootsRelativePath.types

@@ -0,0 +1,7 @@
+//// [tests/cases/compiler/typeRootsRelativePath.ts] ////
+
+=== typeRootsRelativePath.ts ===
+let x = 1;
+>x : number
+>1 : 1
+

testdata/tests/cases/compiler/typeRootsRelativePath.ts

@@ -0,0 +1,5 @@
+// @typeRoots: t
+// @types: n
+// @noEmit: true
+
+let x = 1;