Update reserved keywords

Author: ClassicOldSong

package.json

@@ -1,6 +1,6 @@
 {
   "name": "eft-parser",
-  "version": "0.5.6",
+  "version": "0.5.7",
   "description": "ef.js template parser",
   "main": "dist/eft-parser.min.js",
   "module": "src/eft-parser.js",

src/eft-parser.js

@@ -1,7 +1,7 @@
 import ESCAPE from './escape-parser.js'
 
 const typeSymbols = '>#%@.-+'.split('')
-const reserved = 'before after parent data element refs methods mount umount subscribe unsubscribe update destroy'.split(' ').map(i => `$${i}`)
+const reserved = '$before $after $parent $key $data $element $refs $methods $mount $umount $subscribe $unsubscribe $update $destroy __DIRECTMOUNT__'.split(' ')
 const mustache = /\{\{.+?\}\}/g
 const spaceIndent = /^(\t*)( *).*/
 const hashref = /#([^}]|}[^}])*$/