VSCode merge (#4610)

* Merge from vscode e388c734f30757875976c7e326d6cfeee77710de

* fix yarn lcoks

* remove small issue

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

@@ -0,0 +1,62 @@
+/*---------------------------------------------------------------------------------------------
+ *  Copyright (c) Microsoft Corporation. All rights reserved.
+ *  Licensed under the Source EULA. See License.txt in the project root for license information.
+ *--------------------------------------------------------------------------------------------*/
+
+import { IDisposable } from 'vs/base/common/lifecycle';
+import { IConstructorSignature1 } from 'vs/platform/instantiation/common/instantiation';
+import { IExtHostContext } from 'vs/workbench/api/common/extHost.protocol';
+import { ProxyIdentifier } from 'vs/workbench/services/extensions/common/proxyIdentifier';
+
+export type IExtHostNamedCustomer<T extends IDisposable> = [ProxyIdentifier<T>, IExtHostCustomerCtor<T>];
+
+export type IExtHostCustomerCtor<T extends IDisposable> = IConstructorSignature1<IExtHostContext, T>;
+
+export function extHostNamedCustomer<T extends IDisposable>(id: ProxyIdentifier<T>) {
+	return function (ctor: IExtHostCustomerCtor<T>): void {
+		ExtHostCustomersRegistryImpl.INSTANCE.registerNamedCustomer(id, ctor);
+	};
+}
+
+export function extHostCustomer<T extends IDisposable>(ctor: IExtHostCustomerCtor<T>): void {
+	ExtHostCustomersRegistryImpl.INSTANCE.registerCustomer(ctor);
+}
+
+export namespace ExtHostCustomersRegistry {
+
+	export function getNamedCustomers(): IExtHostNamedCustomer<IDisposable>[] {
+		return ExtHostCustomersRegistryImpl.INSTANCE.getNamedCustomers();
+	}
+
+	export function getCustomers(): IExtHostCustomerCtor<IDisposable>[] {
+		return ExtHostCustomersRegistryImpl.INSTANCE.getCustomers();
+	}
+}
+
+class ExtHostCustomersRegistryImpl {
+
+	public static readonly INSTANCE = new ExtHostCustomersRegistryImpl();
+
+	private _namedCustomers: IExtHostNamedCustomer<any>[];
+	private _customers: IExtHostCustomerCtor<any>[];
+
+	constructor() {
+		this._namedCustomers = [];
+		this._customers = [];
+	}
+
+	public registerNamedCustomer<T extends IDisposable>(id: ProxyIdentifier<T>, ctor: IExtHostCustomerCtor<T>): void {
+		const entry: IExtHostNamedCustomer<T> = [id, ctor];
+		this._namedCustomers.push(entry);
+	}
+	public getNamedCustomers(): IExtHostNamedCustomer<any>[] {
+		return this._namedCustomers;
+	}
+
+	public registerCustomer<T extends IDisposable>(ctor: IExtHostCustomerCtor<T>): void {
+		this._customers.push(ctor);
+	}
+	public getCustomers(): IExtHostCustomerCtor<any>[] {
+		return this._customers;
+	}
+}