diff --git a/.eslintrc.json b/.eslintrc.json
index 97a4645f8..2fa59438c 100644
--- a/.eslintrc.json
+++ b/.eslintrc.json
@@ -38,7 +38,7 @@
     ],
     "import/extensions": [
       2,
-      "ignorePackages"
+      "never"
     ]
   }
-}
\ No newline at end of file
+}
diff --git a/.travis.yml b/.travis.yml
index 5f28442a0..91412f242 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -4,6 +4,7 @@ cache:
     - ~/.npm
     - node_modules
 node_js:
+  - '12'
   - '10'
   - '8'
   - '6'
diff --git a/test/locale/zh.test.js b/test/locale/zh.test.js
index f018eda19..017582a20 100644
--- a/test/locale/zh.test.js
+++ b/test/locale/zh.test.js
@@ -1,8 +1,8 @@
 import dayjs from '../../src'
 import advancedFormat from '../../src/plugin/advancedFormat'
 import weekOfYear from '../../src/plugin/weekOfYear'
-import '../../src/locale/zh.js'
-import '../../src/locale/zh-cn.js'
+import '../../src/locale/zh'
+import '../../src/locale/zh-cn'
 
 dayjs.extend(advancedFormat).extend(weekOfYear)