extensions/typescript-language-features/src/typescriptServiceClient.ts/TypeScriptServiceClient/executeAsync
class TypeScriptServiceClient:	public executeAsync(command: keyof TypeScriptRequests, args: Proto.GeterrRequestArgs, token: vscode.CancellationToken): Promise<ServerResponse.Response<Proto.Response>> {
		return this.executeImpl(command, args, {
			isAsync: true,
			token,
			expectsResult: true
		})[0]!;
	}