Merge from vscode 8e0f348413f4f616c23a88ae30030efa85811973 (#6381)

* Merge from vscode 8e0f348413f4f616c23a88ae30030efa85811973

* disable strict null check

src/sql/workbench/api/browser/mainThreadSerializationProvider.ts

@@ -0,0 +1,59 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { IDisposable, dispose } from 'vs/base/common/lifecycle';
+import {
+	SqlExtHostContext, ExtHostSerializationProviderShape,
+	MainThreadSerializationProviderShape, SqlMainContext
+} from 'sql/workbench/api/node/sqlExtHost.protocol';
+import { ISerializationService } from 'sql/platform/serialization/common/serializationService';
+import * as azdata from 'azdata';
+import { IExtHostContext } from 'vs/workbench/api/common/extHost.protocol';
+import { extHostNamedCustomer } from 'vs/workbench/api/common/extHostCustomers';
+
+@extHostNamedCustomer(SqlMainContext.MainThreadSerializationProvider)
+export class MainThreadSerializationProvider implements MainThreadSerializationProviderShape {
+
+	private _proxy: ExtHostSerializationProviderShape;
+
+	private _toDispose: IDisposable[];
+
+	private _registrations: { [handle: number]: IDisposable; } = Object.create(null);
+
+	constructor(
+		extHostContext: IExtHostContext,
+		@ISerializationService private serializationService: ISerializationService
+
+	) {
+		if (extHostContext) {
+			this._proxy = extHostContext.getProxy(SqlExtHostContext.ExtHostSerializationProvider);
+		}
+	}
+
+	public dispose(): void {
+		this._toDispose = dispose(this._toDispose);
+	}
+
+	public $registerSerializationProvider(handle: number): Promise<any> {
+		let self = this;
+
+		this._registrations[handle] = this.serializationService.addEventListener(handle, {
+			onSaveAs(saveFormat: string, savePath: string, results: string, appendToFile: boolean): Thenable<azdata.SaveResultRequestResult> {
+				return self._proxy.$saveAs(saveFormat, savePath, results, appendToFile);
+			}
+		});
+
+		return undefined;
+	}
+
+	public $unregisterSerializationProvider(handle: number): Promise<any> {
+		let registration = this._registrations[handle];
+		if (registration) {
+			registration.dispose();
+			delete this._registrations[handle];
+		}
+		return undefined;
+	}
+}