🐛 Fix extension name not change

Author: gluons

package.json

@@ -35,6 +35,7 @@
   "dependencies": {
     "cson": "^4.1.0",
     "plugin-error": "^0.1.2",
+    "replace-ext": "^1.0.0",
     "through2": "^2.0.3",
     "vinyl": "^2.1.0"
   },
@@ -47,7 +48,6 @@
     "del": "^3.0.0",
     "globby": "^7.1.1",
     "make-dir": "^1.1.0",
-    "mocha": "*",
-    "replace-ext": "^1.0.0"
+    "mocha": "*"
   }
 }

src/main.coffee

@@ -1,5 +1,6 @@
 CSON = require 'cson'
 PluginError = require 'plugin-error'
+replaceExt = require 'replace-ext'
 through = require 'through2'
 
 PLUGIN_NAME = 'gulp-json2cson'
@@ -14,7 +15,7 @@ module.exports = (indent = '  ') ->
       try
         json = JSON.parse file.contents.toString()
         file.contents = Buffer.from CSON.stringify json, null, indent
-        file.extname = '.cson'
+        file.path = replaceExt file.path, '.cson'
 
         callback null, file
       catch error