fix: change utils && mixins alias

packages/utils/merge.js

@@ -0,0 +1,15 @@
+export default function(target, ...sources) {
+  for (let i = 0; i < sources.length; i++) {
+    const source = sources[i] || {};
+    for (const prop in source) {
+      if (source.hasOwnProperty(prop)) {
+        const value = source[prop];
+        if (value !== undefined) {
+          target[prop] = value;
+        }
+      }
+    }
+  }
+
+  return target;
+};