Merge from vscode 8e0f348413f4f616c23a88ae30030efa85811973 (#6381)

* Merge from vscode 8e0f348413f4f616c23a88ae30030efa85811973

* disable strict null check

src/vs/platform/credentials/node/credentialsService.ts

@@ -0,0 +1,41 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { ICredentialsService } from 'vs/platform/credentials/common/credentials';
+import { IdleValue } from 'vs/base/common/async';
+
+type KeytarModule = {
+	getPassword(service: string, account: string): Promise<string | null>;
+	setPassword(service: string, account: string, password: string): Promise<void>;
+	deletePassword(service: string, account: string): Promise<boolean>;
+	findPassword(service: string): Promise<string | null>;
+};
+
+export class KeytarCredentialsService implements ICredentialsService {
+
+	_serviceBrand: any;
+
+	private readonly _keytar = new IdleValue<Promise<KeytarModule>>(() => import('keytar'));
+
+	async getPassword(service: string, account: string): Promise<string | null> {
+		const keytar = await this._keytar.getValue();
+		return keytar.getPassword(service, account);
+	}
+
+	async setPassword(service: string, account: string, password: string): Promise<void> {
+		const keytar = await this._keytar.getValue();
+		return keytar.setPassword(service, account, password);
+	}
+
+	async deletePassword(service: string, account: string): Promise<boolean> {
+		const keytar = await this._keytar.getValue();
+		return keytar.deletePassword(service, account);
+	}
+
+	async findPassword(service: string): Promise<string | null> {
+		const keytar = await this._keytar.getValue();
+		return keytar.findPassword(service);
+	}
+}