fix: avoid babel options validation error (fix #1209)

Author: yyx990803

Diff for: lib/plugin.js

@@ -138,8 +138,15 @@ function cloneRule (rule, normalizedRule) {
   return res
 }
 
+// Some loaders like babel-loader passes its own option directly to babel
+// and since babel validates the options, "ident" would cause an unknown option
+// error. For these loaders we'll bail out on the ident reuse.
+const reuseIdentBlackList = /babel-loader/
+
+// Reuse options ident, so that imports from within css-loader would get the
+// exact same request prefixes, avoiding duplicated modules (#1199)
 function reuseIdent (use) {
-  if (use.ident) {
+  if (use.ident && !reuseIdentBlackList.test(use.loader)) {
     use.options.ident = use.ident
     delete use.ident
   }

Diff for: test/edgeCases.spec.js

@@ -56,3 +56,23 @@ test('test-less oneOf rules', done => {
     }
   }, res => assertComponent(res, done))
 })
+
+test('babel-loader inline options', done => {
+  mockBundleAndRun({
+    entry: 'basic.vue',
+    module: {
+      rules: [
+        {
+          test: /\.js/,
+          loader: 'babel-loader',
+          options: {
+            babelrc: false,
+            presets: [
+              [require('babel-preset-env'), { modules: false }]
+            ]
+          }
+        }
+      ]
+    }
+  }, res => assertComponent(res, done))
+})