Internal: js-file - add es6/module to escope options

Fixes #1875

Author: hzoo

lib/js-file.js

@@ -754,7 +754,10 @@ JsFile.prototype = {
      */
     getScope: function() {
         if (!this._scope) {
-            this._scope = escope.analyze(this._tree);
+            this._scope = escope.analyze(this._tree, {
+                ecmaVersion: 6,
+                sourceType: 'module'
+            });
         }
 
         return this._scope;

test/specs/rules/disallow-unused-params.js

@@ -23,6 +23,12 @@ describe('rules/disallow-unused-params', function() {
         )).to.have.no.errors();
     });
 
+    it('should not error with es6 imports #1875', function() {
+        expect(checker.checkString(
+            'import one from "one"; function some() {}'
+        )).to.have.no.errors();
+    });
+
     it('should report unused param', function() {
         expect(checker.checkString(
             'function fun(test) { }'