Adding base indentation for script block formatting and smart indent

src/server/editorServices.ts

@@ -1389,6 +1389,7 @@ namespace ts.server {
 
         static getDefaultFormatCodeOptions(host: ServerHost): ts.FormatCodeOptions {
             return ts.clone({
+                BaseIndentSize: 0,
                 IndentSize: 4,
                 TabSize: 4,
                 NewLineCharacter: host.newLine || "\n",

src/server/protocol.d.ts

@@ -434,6 +434,9 @@ declare namespace ts.server.protocol {
         /** Number of spaces to indent during formatting. Default value is 4. */
         indentSize?: number;
 
+        /** Number of additional spaces to indent during formatting to preserve base indentation (ex. script block indentation). Default value is 0. */
+        baseIndentSize?: number;
+
         /** The new line character to be used. Default value is the OS line delimiter. */
         newLineCharacter?: string;
 
@@ -474,7 +477,7 @@ declare namespace ts.server.protocol {
         placeOpenBraceOnNewLineForControlBlocks?: boolean;
 
         /** Index operator */
-        [key: string]: string | number | boolean;
+        [key: string]: string | number | boolean | undefined;
     }
 
     /**

src/server/session.ts

@@ -674,6 +674,7 @@ namespace ts.server {
                         if (lineText.search("\\S") < 0) {
                             // TODO: get these options from host
                             const editorOptions: ts.EditorOptions = {
+                                BaseIndentSize: formatOptions.BaseIndentSize,
                                 IndentSize: formatOptions.IndentSize,
                                 TabSize: formatOptions.TabSize,
                                 NewLineCharacter: formatOptions.NewLineCharacter,