update javascript and typescript snippets

add snippets for bdd-style tests

vim/vim.symlink/snippets/javascript.snippets

@@ -20,6 +20,9 @@ snippet :
 snippet :f
 	${1:method_name}: function (${2:args}) {
 	}
+snippet fn
+	function () {
+	}
 snippet fun
 	function ${1:name}(${2:args}) {
 	}
@@ -40,3 +43,9 @@ snippet lpurple
 	console.log('%c${1}', 'font-weight:bold;color:purple;');
 snippet ctab
 	console.table(${1});
+snippet des
+	describe('${1}', function () {
+	});
+snippet it
+	it('${1}', function () {
+	});