Add providerId array to authentication namespace

src/vs/vscode.proposed.d.ts

@@ -76,9 +76,9 @@ declare module 'vscode' {
 		export const onDidChangeAuthenticationProviders: Event<AuthenticationProvidersChangeEvent>;
 
 		/**
-		 * Returns whether a provider with providerId is currently registered.
+		 * An array of the ids of authentication providers that are currently registered.
 		 */
-		export function hasProvider(providerId: string): boolean;
+		export const providerIds: string[];
 
 		/**
 		 * Get existing authentication sessions. Rejects if a provider with providerId is not

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

@@ -188,8 +188,8 @@ export function createApiFactoryAndRegisterActors(accessor: ServicesAccessor): I
 			get onDidChangeAuthenticationProviders(): Event<vscode.AuthenticationProvidersChangeEvent> {
 				return extHostAuthentication.onDidChangeAuthenticationProviders;
 			},
-			hasProvider(providerId: string): boolean {
-				return extHostAuthentication.hasProvider(providerId);
+			get providerIds(): string[] {
+				return extHostAuthentication.providerIds;
 			},
 			getSessions(providerId: string, scopes: string[]): Thenable<readonly vscode.AuthenticationSession[]> {
 				return extHostAuthentication.getSessions(extension, providerId, scopes);

src/vs/workbench/api/common/extHostAuthentication.ts

@@ -24,8 +24,13 @@ export class ExtHostAuthentication implements ExtHostAuthenticationShape {
 		this._proxy = mainContext.getProxy(MainContext.MainThreadAuthentication);
 	}
 
-	hasProvider(providerId: string): boolean {
-		return !!this._authenticationProviders.get(providerId);
+	get providerIds(): string[] {
+		const ids: string[] = [];
+		this._authenticationProviders.forEach(provider => {
+			ids.push(provider.id);
+		});
+
+		return ids;
 	}
 
 	async getSessions(requestingExtension: IExtensionDescription, providerId: string, scopes: string[]): Promise<readonly vscode.AuthenticationSession[]> {