made the pack completely portable and wrote relevent bat files to go with it

gitportable/usr/share/vim/vim91/compiler/jest.vim

@@ -0,0 +1,28 @@
+" Vim compiler file
+" Compiler:	Jest
+" Maintainer:	Doug Kearns <dougkearns@gmail.com>
+" Last Change:	2024 Apr 03
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "jest"
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+" CompilerSet makeprg=npx\ --no-install\ jest\ --no-colors
+
+CompilerSet makeprg=jest\ --no-colors
+CompilerSet errorformat=%-A\ \ ●\ Console,
+		       \%E\ \ ●\ %m,
+		       \%Z\ %\\{4}%.%#Error:\ %f:\ %m\ (%l:%c):%\\=,
+		       \%Z\ %\\{6}at\ %\\S%#\ (%f:%l:%c),
+		       \%Z\ %\\{6}at\ %\\S%#\ %f:%l:%c,
+		       \%+C\ %\\{4}%\\w%.%#,
+		       \%+C\ %\\{4}%[-+]%.%#,
+		       \%-C%.%#,
+		       \%-G%.%#
+
+let &cpo = s:cpo_save
+unlet s:cpo_save