Merge from vscode 64980ea1f3f532c82bb6c28d27bba9ef2c5b4463 (#7206)

* Merge from vscode 64980ea1f3f532c82bb6c28d27bba9ef2c5b4463

* fix config changes

* fix strictnull checks

test/automation/src/logger.ts

@@ -0,0 +1,42 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { appendFileSync, writeFileSync } from 'fs';
+import { format } from 'util';
+import { EOL } from 'os';
+
+export interface Logger {
+	log(message: string, ...args: any[]): void;
+}
+
+export class ConsoleLogger implements Logger {
+
+	log(message: string, ...args: any[]): void {
+		console.log('**', message, ...args);
+	}
+}
+
+export class FileLogger implements Logger {
+
+	constructor(private path: string) {
+		writeFileSync(path, '');
+	}
+
+	log(message: string, ...args: any[]): void {
+		const date = new Date().toISOString();
+		appendFileSync(this.path, `[${date}] ${format(message, ...args)}${EOL}`);
+	}
+}
+
+export class MultiLogger implements Logger {
+
+	constructor(private loggers: Logger[]) { }
+
+	log(message: string, ...args: any[]): void {
+		for (const logger of this.loggers) {
+			logger.log(message, ...args);
+		}
+	}
+}