diff --git a/extensions/typescript-language-features/src/languageFeatures/mappedCodeEditProvider.ts b/extensions/typescript-language-features/src/languageFeatures/mappedCodeEditProvider.ts
index 0d04d2dc808..06ce5557b6c 100644
--- a/extensions/typescript-language-features/src/languageFeatures/mappedCodeEditProvider.ts
+++ b/extensions/typescript-language-features/src/languageFeatures/mappedCodeEditProvider.ts
@@ -27,8 +27,8 @@ class TsMappedEditsProvider implements vscode.MappedEditsProvider {
 		}
 
 		const response = await this.client.execute('mapCode', {
-			mappings: [{
-				file,
+			file,
+			mapping: {
 				contents: codeBlocks,
 				focusLocations: context.documents.map(documents => {
 					return documents.flatMap((contextItem): FileSpan[] => {
@@ -39,7 +39,7 @@ class TsMappedEditsProvider implements vscode.MappedEditsProvider {
 						return contextItem.ranges.map((range): FileSpan => ({ file, ...Range.toTextSpan(range) }));
 					});
 				}),
-			}],
+			}
 		}, token);
 		if (response.type !== 'response' || !response.body) {
 			return;
diff --git a/extensions/typescript-language-features/src/tsServer/protocol/protocol.d.ts b/extensions/typescript-language-features/src/tsServer/protocol/protocol.d.ts
index 45e09d63481..aa9b0589d2d 100644
--- a/extensions/typescript-language-features/src/tsServer/protocol/protocol.d.ts
+++ b/extensions/typescript-language-features/src/tsServer/protocol/protocol.d.ts
@@ -20,42 +20,36 @@ declare module '../../../../node_modules/typescript/lib/typescript' {
 			readonly _serverType?: ServerType;
 		}
 
-		export interface MapCodeRequestArgs {
-			/// The files and changes to try and apply/map.
-			mappings: MapCodeRequestDocumentMapping[];
-
-			/// Edits to apply to the current workspace before performing the mapping.
-			updates?: FileCodeEdits[]
+		export interface MapCodeRequestArgs extends FileRequestArgs {
+			/**
+			 * The files and changes to try and apply/map.
+			 */
+			mapping: MapCodeRequestDocumentMapping;
 		}
 
 		export interface MapCodeRequestDocumentMapping {
-			/// The file for the request (absolute pathname required). Null/undefined
-			/// if specific file is unknown.
-			file?: string;
-
-			/// Optional name of project that contains file
-			projectFileName?: string;
-
-			/// The specific code to map/insert/replace in the file.
+			/**
+			 * The specific code to map/insert/replace in the file.
+			 */
 			contents: string[];
 
-			/// Areas of "focus" to inform the code mapper with. For example, cursor
-			/// location, current selection, viewport, etc. Nested arrays denote
-			/// priority: toplevel arrays are more important than inner arrays, and
-			/// inner array priorities are based on items within that array. Items
-			/// earlier in the arrays have higher priority.
-			focusLocations?: FileSpan[][];
+			/**
+			 * Areas of "focus" to inform the code mapper with. For example, cursor
+			 * location, current selection, viewport, etc. Nested arrays denote
+			 * priority: toplevel arrays are more important than inner arrays, and
+			 * inner array priorities are based on items within that array. Items
+			 * earlier in the arrays have higher priority.
+			 */
+			focusLocations?: TextSpan[][];
 		}
 
-		export interface MapCodeRequest extends Request {
-			command: 'mapCode',
+		export interface MapCodeRequest extends FileRequest {
+			command: 'mapCode';
 			arguments: MapCodeRequestArgs;
 		}
 
 		export interface MapCodeResponse extends Response {
-			body: FileCodeEdits[]
+			body: readonly FileCodeEdits[];
 		}
 	}
 }
-
-