Remove web worker support from microsoft-authentication extension (#276762)

* Initial plan

* Remove web worker support from microsoft-authentication extension

- Remove browser entry point from package.json
- Remove browser webpack configuration
- Remove browser-specific scripts (compile-web, watch-web)
- Remove src/browser/ directory with browser-specific implementations
- Remove ExtensionHost.WebWorker enum value
- Remove supportsWebWorkerExtensionHost flags from all flows
- Simplify authProvider.ts by removing web worker detection logic
- Remove web worker test case from flows.test.ts
- Successfully compiled with 0 errors

Co-authored-by: TylerLeonhardt <2644648+TylerLeonhardt@users.noreply.github.com>

* couple references

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>

extensions/microsoft-authentication/src/node/authProvider.ts

@@ -209,12 +209,9 @@ export class MsalAuthProvider implements AuthenticationProvider {
 			}
 		};
 
-		const isNodeEnvironment = typeof process !== 'undefined' && typeof process?.versions?.node === 'string';
 		const callbackUri = await env.asExternalUri(Uri.parse(`${env.uriScheme}://vscode.microsoft-authentication`));
 		const flows = getMsalFlows({
-			extensionHost: isNodeEnvironment
-				? this._context.extension.extensionKind === ExtensionKind.UI ? ExtensionHost.Local : ExtensionHost.Remote
-				: ExtensionHost.WebWorker,
+			extensionHost: this._context.extension.extensionKind === ExtensionKind.UI ? ExtensionHost.Local : ExtensionHost.Remote,
 			supportedClient: isSupportedClient(callbackUri),
 			isBrokerSupported: cachedPca.isBrokerAvailable
 		});
@@ -348,12 +345,9 @@ export class MsalAuthProvider implements AuthenticationProvider {
 			}
 		};
 
-		const isNodeEnvironment = typeof process !== 'undefined' && typeof process?.versions?.node === 'string';
 		const callbackUri = await env.asExternalUri(Uri.parse(`${env.uriScheme}://vscode.microsoft-authentication`));
 		const flows = getMsalFlows({
-			extensionHost: isNodeEnvironment
-				? this._context.extension.extensionKind === ExtensionKind.UI ? ExtensionHost.Local : ExtensionHost.Remote
-				: ExtensionHost.WebWorker,
+			extensionHost: this._context.extension.extensionKind === ExtensionKind.UI ? ExtensionHost.Local : ExtensionHost.Remote,
 			isBrokerSupported: cachedPca.isBrokerAvailable,
 			supportedClient: isSupportedClient(callbackUri)
 		});

extensions/microsoft-authentication/src/node/flows.ts

@@ -14,14 +14,12 @@ import { Config } from '../common/config';
 const DEFAULT_REDIRECT_URI = 'https://vscode.dev/redirect';
 
 export const enum ExtensionHost {
-	WebWorker,
 	Remote,
 	Local
 }
 
 interface IMsalFlowOptions {
 	supportsRemoteExtensionHost: boolean;
-	supportsWebWorkerExtensionHost: boolean;
 	supportsUnsupportedClient: boolean;
 	supportsBroker: boolean;
 }
@@ -48,7 +46,6 @@ class DefaultLoopbackFlow implements IMsalFlow {
 	label = 'default';
 	options: IMsalFlowOptions = {
 		supportsRemoteExtensionHost: false,
-		supportsWebWorkerExtensionHost: false,
 		supportsUnsupportedClient: true,
 		supportsBroker: true
 	};
@@ -78,7 +75,6 @@ class UrlHandlerFlow implements IMsalFlow {
 	label = 'protocol handler';
 	options: IMsalFlowOptions = {
 		supportsRemoteExtensionHost: true,
-		supportsWebWorkerExtensionHost: false,
 		supportsUnsupportedClient: false,
 		supportsBroker: false
 	};
@@ -108,7 +104,6 @@ class DeviceCodeFlow implements IMsalFlow {
 	label = 'device code';
 	options: IMsalFlowOptions = {
 		supportsRemoteExtensionHost: true,
-		supportsWebWorkerExtensionHost: false,
 		supportsUnsupportedClient: true,
 		supportsBroker: false
 	};
@@ -139,13 +134,8 @@ export function getMsalFlows(query: IMsalFlowQuery): IMsalFlow[] {
 	const flows = [];
 	for (const flow of allFlows) {
 		let useFlow: boolean = true;
-		switch (query.extensionHost) {
-			case ExtensionHost.Remote:
-				useFlow &&= flow.options.supportsRemoteExtensionHost;
-				break;
-			case ExtensionHost.WebWorker:
-				useFlow &&= flow.options.supportsWebWorkerExtensionHost;
-				break;
+		if (query.extensionHost === ExtensionHost.Remote) {
+			useFlow &&= flow.options.supportsRemoteExtensionHost;
 		}
 		useFlow &&= flow.options.supportsBroker || !query.isBrokerSupported;
 		useFlow &&= flow.options.supportsUnsupportedClient || query.supportedClient;

extensions/microsoft-authentication/src/node/test/flows.test.ts

@@ -43,16 +43,6 @@ suite('getMsalFlows', () => {
 		assert.strictEqual(flows[1].label, 'device code');
 	});
 
-	test('should return no flows for web worker extension host', () => {
-		const query: IMsalFlowQuery = {
-			extensionHost: ExtensionHost.WebWorker,
-			supportedClient: true,
-			isBrokerSupported: false
-		};
-		const flows = getMsalFlows(query);
-		assert.strictEqual(flows.length, 0);
-	});
-
 	test('should return only default and device code flows for local extension host with unsupported client and no broker', () => {
 		const query: IMsalFlowQuery = {
 			extensionHost: ExtensionHost.Local,