Allow custom switch-case indentation in formatting (#53733)

src/server/protocol.ts

@@ -3418,6 +3418,7 @@ export interface FormatCodeSettings extends EditorSettings {
     placeOpenBraceOnNewLineForControlBlocks?: boolean;
     insertSpaceBeforeTypeAnnotation?: boolean;
     semicolons?: SemicolonPreference;
+    indentSwitchCase?: boolean;
 }
 
 export interface UserPreferences {

src/services/formatting/smartIndenter.ts

@@ -653,9 +653,6 @@ export namespace SmartIndenter {
             case SyntaxKind.TypeLiteral:
             case SyntaxKind.MappedType:
             case SyntaxKind.TupleType:
-            case SyntaxKind.CaseBlock:
-            case SyntaxKind.DefaultClause:
-            case SyntaxKind.CaseClause:
             case SyntaxKind.ParenthesizedExpression:
             case SyntaxKind.PropertyAccessExpression:
             case SyntaxKind.CallExpression:
@@ -684,7 +681,11 @@ export namespace SmartIndenter {
             case SyntaxKind.ExportSpecifier:
             case SyntaxKind.ImportSpecifier:
             case SyntaxKind.PropertyDeclaration:
+            case SyntaxKind.CaseClause:
+            case SyntaxKind.DefaultClause:
                 return true;
+            case SyntaxKind.CaseBlock:
+                return settings.indentSwitchCase ?? true;
             case SyntaxKind.VariableDeclaration:
             case SyntaxKind.PropertyAssignment:
             case SyntaxKind.BinaryExpression:

src/services/types.ts

@@ -1118,6 +1118,7 @@ export interface FormatCodeSettings extends EditorSettings {
     readonly insertSpaceBeforeTypeAnnotation?: boolean;
     readonly indentMultiLineObjectLiteralBeginningOnBlankLine?: boolean;
     readonly semicolons?: SemicolonPreference;
+    readonly indentSwitchCase?: boolean;
 }
 
 export function getDefaultFormatCodeSettings(newLineCharacter?: string): FormatCodeSettings {
@@ -1142,7 +1143,8 @@ export function getDefaultFormatCodeSettings(newLineCharacter?: string): FormatC
         placeOpenBraceOnNewLineForFunctions: false,
         placeOpenBraceOnNewLineForControlBlocks: false,
         semicolons: SemicolonPreference.Ignore,
-        trimTrailingWhitespace: true
+        trimTrailingWhitespace: true,
+        indentSwitchCase: true
     };
 }