extensions/typescript-language-features/src/languageFeatures/jsDocCompletions.ts/register
export function register(
	selector: DocumentSelector,
	language: LanguageDescription,
	client: ITypeScriptServiceClient,
	fileConfigurationManager: FileConfigurationManager,

): vscode.Disposable {
	return vscode.languages.registerCompletionItemProvider(selector.syntax,
		new JsDocCompletionProvider(client, language, fileConfigurationManager),
		'*');
}