From 00902daee162cb15654cabbdde7011f42c81b6c5 Mon Sep 17 00:00:00 2001
From: Daniel Rosenwasser <DanielRosenwasser@users.noreply.github.com>
Date: Wed, 14 Sep 2022 09:34:04 -0700
Subject: [PATCH] Instantiate ExperimentationService in
 typescript-language-features. (#160877)

Co-authored-by: Matt Bierner <matb@microsoft.com>
---
 .../src/experimentationService.ts                             | 2 +-
 extensions/typescript-language-features/src/extension.ts      | 4 ++++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/extensions/typescript-language-features/src/experimentationService.ts b/extensions/typescript-language-features/src/experimentationService.ts
index 3b24c612c9a..cb566874433 100644
--- a/extensions/typescript-language-features/src/experimentationService.ts
+++ b/extensions/typescript-language-features/src/experimentationService.ts
@@ -23,7 +23,7 @@ export class ExperimentationService implements vscode.Disposable {
 	public async getTreatmentVariable<K extends keyof ExperimentTypes>(name: K, defaultValue: ExperimentTypes[K]): Promise<ExperimentTypes[K]> {
 		const experimentationService = await this._experimentationServicePromise;
 		try {
-			const treatmentVariable = experimentationService.getTreatmentVariableAsync('vscode', name, /*checkCache*/ true) as ExperimentTypes[K];
+			const treatmentVariable = experimentationService.getTreatmentVariableAsync('vscode', name, /*checkCache*/ true) as Promise<ExperimentTypes[K]>;
 			return treatmentVariable;
 		} catch {
 			return defaultValue;
diff --git a/extensions/typescript-language-features/src/extension.ts b/extensions/typescript-language-features/src/extension.ts
index e6ae13e5daa..b803afab057 100644
--- a/extensions/typescript-language-features/src/extension.ts
+++ b/extensions/typescript-language-features/src/extension.ts
@@ -8,6 +8,7 @@ import * as vscode from 'vscode';
 import { Api, getExtensionApi } from './api';
 import { CommandManager } from './commands/commandManager';
 import { registerBaseCommands } from './commands/index';
+import { ExperimentationService } from './experimentationService';
 import { createLazyClientHost, lazilyActivateClient } from './lazyClientHost';
 import { nodeRequestCancellerFactory } from './tsServer/cancellation.electron';
 import { NodeLogDirectoryProvider } from './tsServer/logDirectoryProvider.electron';
@@ -52,6 +53,9 @@ export function activate(
 
 	registerBaseCommands(commandManager, lazyClientHost, pluginManager, activeJsTsEditorTracker);
 
+	// Currently no variables in use.
+	new ExperimentationService(context);
+
 	import('./task/taskProvider').then(module => {
 		context.subscriptions.push(module.register(lazyClientHost.map(x => x.serviceClient)));
 	});