fix(demo): flag extension as web

demo/src/features/debugger.ts

@@ -1,13 +1,15 @@
 import { ExtensionHostKind, registerExtension } from 'vscode/extensions'
 import type * as vscode from 'vscode'
 
-const { getApi } = registerExtension({
+const { getApi, registerFileUrl } = registerExtension({
   name: 'debugger',
   publisher: 'codingame',
   version: '1.0.0',
   engines: {
     vscode: '*'
   },
+  // A browser field is mandatory for the extension to be flagged as `web`
+  browser: 'extension.js',
   contributes: {
     debuggers: [{
       type: 'javascript',
@@ -20,6 +22,8 @@ const { getApi } = registerExtension({
   }
 }, ExtensionHostKind.LocalProcess)
 
+registerFileUrl('./extension.js', 'data:text/javascript;base64,' + window.btoa('// nothing'))
+
 void getApi().then(async debuggerVscodeApi => {
   class WebsocketDebugAdapter implements vscode.DebugAdapter {
     constructor (private websocket: WebSocket) {