diff --git a/.eslintrc.yaml b/.eslintrc.yaml
index 0473b0f..2af7adc 100644
--- a/.eslintrc.yaml
+++ b/.eslintrc.yaml
@@ -1,5 +1,5 @@
 env:
   node: true
-extends: problems
+extends: problems/node10
 rules:
   no-console: off
diff --git a/index.js b/index.js
index 8d79228..e54247d 100644
--- a/index.js
+++ b/index.js
@@ -187,7 +187,7 @@ function css(css, file) {
   return rc(ctx, argv.config)
     .then(config => {
       config = config || cliConfig
-      const options = Object.assign({}, config.options)
+      const options = { ...config.options }
 
       if (file === 'stdin' && output) file = output
 
@@ -235,13 +235,7 @@ function css(css, file) {
 
             const messages = result.warnings()
             if (messages.length) {
-              console.warn(
-                reporter(
-                  Object.assign({}, result, {
-                    messages
-                  })
-                )
-              )
+              console.warn(reporter({ ...result, messages }))
             }
 
             return result
diff --git a/test/.eslintrc.yaml b/test/.eslintrc.yaml
index 066cdcd..add5a78 100644
--- a/test/.eslintrc.yaml
+++ b/test/.eslintrc.yaml
@@ -1,3 +1,2 @@
 parserOptions:
-  ecmaVersion: 2017
   sourceType: module