Expose FILE_CONST

Expose FILE_CONST for 3rd party developer

Author: rexrainbow

src/loader/index.js

@@ -12,6 +12,7 @@ module.exports = {
 
     FileTypes: require('./filetypes'),
 
+    CONST: require('./const'),
     File: require('./File'),
     FileTypesManager: require('./FileTypesManager'),
     GetURL: require('./GetURL'),