extensions/typescript-language-features/src/languageFeatures/documentSymbol.ts/TypeScriptDocumentSymbolProvider/shouldInclueEntry
class TypeScriptDocumentSymbolProvider:	private static shouldInclueEntry(item: Proto.NavigationTree | Proto.NavigationBarItem): boolean {
		if (item.kind === PConst.Kind.alias) {
			return false;
		}
		return !!(item.text && item.text !== '<function>' && item.text !== '<class>');
	}