first cut proposed api for vscode.open, #66741

src/vs/workbench/api/node/extHost.api.impl.ts

@@ -497,6 +497,9 @@ export function createApiFactory(
 			createInputBox(): vscode.InputBox {
 				return extHostQuickOpen.createInputBox(extension.identifier);
 			},
+			open: proposedApiFunction(extension, (uri: URI) => {
+				return extHostWindow.openUri(uri);
+			})
 		};
 
 		// namespace: workspace

src/vs/workbench/api/node/extHost.protocol.ts

@@ -621,6 +621,7 @@ export interface MainThreadDebugServiceShape extends IDisposable {
 
 export interface MainThreadWindowShape extends IDisposable {
 	$getWindowVisibility(): Promise<boolean>;
+	$openUri(uri: UriComponents): Promise<any>;
 }
 
 // -- extension host

src/vs/workbench/api/node/extHostWindow.ts

@@ -6,6 +6,7 @@
 import { Event, Emitter } from 'vs/base/common/event';
 import { ExtHostWindowShape, MainContext, MainThreadWindowShape, IMainContext } from './extHost.protocol';
 import { WindowState } from 'vscode';
+import { URI } from 'vs/base/common/uri';
 
 export class ExtHostWindow implements ExtHostWindowShape {
 
@@ -34,4 +35,8 @@ export class ExtHostWindow implements ExtHostWindowShape {
 		this._state = { ...this._state, focused };
 		this._onDidChangeWindowState.fire(this._state);
 	}
+
+	openUri(uri: URI): Promise<boolean> {
+		return this._proxy.$openUri(uri);
+	}
 }