extract auth#session into its own proposal file, make isProposedApiEnabled and checkProposedApiEnabled more strict by forcing them to be called with undefined or a proposal name, https://github.com/microsoft/vscode/issues/131165

src/vscode-dts/vscode.proposed.authSession.d.ts

@@ -0,0 +1,40 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the MIT License. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+declare module 'vscode' {
+
+	/**
+	 * More options to be used when getting an {@link AuthenticationSession} from an {@link AuthenticationProvider}.
+	 */
+	export interface AuthenticationGetSessionOptions {
+		/**
+		 * Whether we should attempt to reauthenticate even if there is already a session available.
+		 *
+		 * If true, a modal dialog will be shown asking the user to sign in again. This is mostly used for scenarios
+		 * where the token needs to be re minted because it has lost some authorization.
+		 *
+		 * Defaults to false.
+		 */
+		forceNewSession?: boolean | { detail: string };
+	}
+
+	export namespace authentication {
+		/**
+		 * Get an authentication session matching the desired scopes. Rejects if a provider with providerId is not
+		 * registered, or if the user does not consent to sharing authentication information with
+		 * the extension. If there are multiple sessions with the same scopes, the user will be shown a
+		 * quickpick to select which account they would like to use.
+		 *
+		 * Currently, there are only two authentication providers that are contributed from built in extensions
+		 * to the editor that implement GitHub and Microsoft authentication: their providerId's are 'github' and 'microsoft'.
+		 * @param providerId The id of the provider to use
+		 * @param scopes A list of scopes representing the permissions requested. These are dependent on the authentication provider
+		 * @param options The {@link AuthenticationGetSessionOptions} to use
+		 * @returns A thenable that resolves to an authentication session
+		 */
+		export function getSession(providerId: string, scopes: readonly string[], options: AuthenticationGetSessionOptions & { forceNewSession: true | { detail: string } }): Thenable<AuthenticationSession>;
+		export function hasSession(providerId: string, scopes: readonly string[]): Thenable<boolean>;
+	}
+}