diff --git a/src/vs/vscode.d.ts b/src/vs/vscode.d.ts
index 864f4f44386..3c08b54bce1 100644
--- a/src/vs/vscode.d.ts
+++ b/src/vs/vscode.d.ts
@@ -5792,7 +5792,7 @@ declare module 'vscode' {
 	/**
 	 * A link on a terminal line.
 	 */
-	export interface TerminalLink {
+	export class TerminalLink {
 		/**
 		 * The start index of the link on {@link TerminalLinkContext.line}.
 		 */
@@ -5811,6 +5811,8 @@ declare module 'vscode' {
 		 * depending on OS, user settings, and localization.
 		 */
 		tooltip?: string;
+
+		constructor(startIndex: number, length: number, tooltip?: string);
 	}
 
 	/**
diff --git a/src/vs/workbench/api/common/extHost.api.impl.ts b/src/vs/workbench/api/common/extHost.api.impl.ts
index f24fc12689f..4a905aa1602 100644
--- a/src/vs/workbench/api/common/extHost.api.impl.ts
+++ b/src/vs/workbench/api/common/extHost.api.impl.ts
@@ -1252,6 +1252,7 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 			TaskPanelKind: extHostTypes.TaskPanelKind,
 			TaskRevealKind: extHostTypes.TaskRevealKind,
 			TaskScope: extHostTypes.TaskScope,
+			TerminalLink: extHostTypes.TerminalLink,
 			TerminalProfile: extHostTypes.TerminalProfile,
 			TextDocumentSaveReason: extHostTypes.TextDocumentSaveReason,
 			TextEdit: extHostTypes.TextEdit,
diff --git a/src/vs/workbench/api/common/extHostTypes.ts b/src/vs/workbench/api/common/extHostTypes.ts
index 0e7a67b314e..2ed9688c95d 100644
--- a/src/vs/workbench/api/common/extHostTypes.ts
+++ b/src/vs/workbench/api/common/extHostTypes.ts
@@ -1707,10 +1707,31 @@ export enum SourceControlInputBoxValidationType {
 	Information = 2
 }
 
+export class TerminalLink implements vscode.TerminalLink {
+	constructor(
+		public startIndex: number,
+		public length: number,
+		public tooltip?: string
+	) {
+		if (typeof startIndex !== 'number') {
+			throw illegalArgument('startIndex');
+		}
+		if (typeof length !== 'number') {
+			throw illegalArgument('length');
+		}
+		if (tooltip !== undefined && typeof tooltip !== 'string') {
+			throw illegalArgument('tooltip');
+		}
+	}
+}
+
 export class TerminalProfile implements vscode.TerminalProfile {
 	constructor(
 		public options: vscode.TerminalOptions | vscode.ExtensionTerminalOptions
 	) {
+		if (typeof options !== 'object') {
+			illegalArgument('options');
+		}
 	}
 }