diff --git a/src/vs/workbench/api/common/extHost.api.impl.ts b/src/vs/workbench/api/common/extHost.api.impl.ts
index 5a1465f00a3..acdf0672025 100644
--- a/src/vs/workbench/api/common/extHost.api.impl.ts
+++ b/src/vs/workbench/api/common/extHost.api.impl.ts
@@ -673,7 +673,7 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 				checkProposedApiEnabled(extension, 'editorInsets');
 				return extHostEditorInsets.createWebviewEditorInset(editor, line, height, options, extension);
 			},
-			createTerminal(nameOrOptions?: vscode.TerminalOptions | vscode.ExtensionTerminalOptions | string, shellPath?: string, shellArgs?: string[] | string): vscode.Terminal {
+			createTerminal(nameOrOptions?: vscode.TerminalOptions | vscode.ExtensionTerminalOptions | string, shellPath?: string, shellArgs?: readonly string[] | string): vscode.Terminal {
 				if (typeof nameOrOptions === 'object') {
 					if ('pty' in nameOrOptions) {
 						return extHostTerminalService.createExtensionTerminal(nameOrOptions);
diff --git a/src/vs/workbench/api/common/extHostTerminalService.ts b/src/vs/workbench/api/common/extHostTerminalService.ts
index 12643cef941..1aa1e678e00 100644
--- a/src/vs/workbench/api/common/extHostTerminalService.ts
+++ b/src/vs/workbench/api/common/extHostTerminalService.ts
@@ -38,7 +38,7 @@ export interface IExtHostTerminalService extends ExtHostTerminalServiceShape, ID
 	onDidChangeTerminalState: Event<vscode.Terminal>;
 	onDidWriteTerminalData: Event<vscode.TerminalDataWriteEvent>;
 
-	createTerminal(name?: string, shellPath?: string, shellArgs?: string[] | string): vscode.Terminal;
+	createTerminal(name?: string, shellPath?: string, shellArgs?: readonly string[] | string): vscode.Terminal;
 	createTerminalFromOptions(options: vscode.TerminalOptions, internalOptions?: ITerminalInternalOptions): vscode.Terminal;
 	createExtensionTerminal(options: vscode.ExtensionTerminalOptions): vscode.Terminal;
 	attachPtyToTerminal(id: number, pty: vscode.Pseudoterminal): void;
diff --git a/src/vscode-dts/vscode.d.ts b/src/vscode-dts/vscode.d.ts
index badebabb873..d99d78c8c89 100644
--- a/src/vscode-dts/vscode.d.ts
+++ b/src/vscode-dts/vscode.d.ts
@@ -3530,7 +3530,7 @@ declare module 'vscode' {
 		 * value starting at 1.
 		 * @return This snippet string.
 		 */
-		appendChoice(values: string[], number?: number): SnippetString;
+		appendChoice(values: readonly string[], number?: number): SnippetString;
 
 		/**
 		 * Builder-function that appends a variable (`${VAR}`) to
@@ -3622,7 +3622,7 @@ declare module 'vscode' {
 		 * @param tokenType The token type.
 		 * @param tokenModifiers The token modifiers.
 		 */
-		push(range: Range, tokenType: string, tokenModifiers?: string[]): void;
+		push(range: Range, tokenType: string, tokenModifiers?: readonly string[]): void;
 
 		/**
 		 * Finish and create a `SemanticTokens` instance.
@@ -9522,7 +9522,7 @@ declare module 'vscode' {
 		 * @return A new Terminal.
 		 * @throws When running in an environment where a new process cannot be started.
 		 */
-		export function createTerminal(name?: string, shellPath?: string, shellArgs?: string[] | string): Terminal;
+		export function createTerminal(name?: string, shellPath?: string, shellArgs?: readonly string[] | string): Terminal;
 
 		/**
 		 * Creates a {@link Terminal} with a backing shell process.
@@ -11000,7 +11000,7 @@ declare module 'vscode' {
 		 *
 		 * @param thenable A thenable that resolves to {@link TextEdit pre-save-edits}.
 		 */
-		waitUntil(thenable: Thenable<TextEdit[]>): void;
+		waitUntil(thenable: Thenable<readonly TextEdit[]>): void;
 
 		/**
 		 * Allows to pause the event loop until the provided thenable resolved.