Update runtime files.

runtime/compiler/jest.vim

@@ -0,0 +1,30 @@
+" Vim compiler file
+" Compiler:	Jest
+" Maintainer:	Doug Kearns <dougkearns@gmail.com>
+" Last Change:	2018 May 15
+
+if exists("current_compiler")
+  finish
+endif
+let current_compiler = "jest"
+
+if exists(":CompilerSet") != 2		" older Vim always used :setlocal
+  command -nargs=* CompilerSet setlocal <args>
+endif
+
+let s:cpo_save = &cpo
+set cpo&vim
+
+" CompilerSet makeprg=npx\ jest\ --no-colors
+
+CompilerSet makeprg=jest\ --no-colors
+CompilerSet errorformat=%E\ \ ●\ %m,
+		       \%Z\ %\\{4}%.%#Error:\ %f:\ %m\ (%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