diff --git a/src/util/findColor.js b/src/util/findColor.js
index 56295ad7d..1e58f847c 100644
--- a/src/util/findColor.js
+++ b/src/util/findColor.js
@@ -1,5 +1,5 @@
-const _ = require('lodash')
+import _ from 'lodash'
 
-module.exports = function findColor(colors, color) {
+export default function findColor(colors, color) {
   return _.get(colors, color, color)
 }
diff --git a/src/util/normalizeColorList.js b/src/util/normalizeColorList.js
index 6bc713608..bd17c743a 100644
--- a/src/util/normalizeColorList.js
+++ b/src/util/normalizeColorList.js
@@ -1,8 +1,8 @@
-const _ = require('lodash')
-const defineClass = require('../util/defineClass')
-const findColor = require('../util/findColor')
+import _ from 'lodash'
+import defineClass from './defineClass'
+import findColor from './findColor'
 
-module.exports = function (colors, colorPool) {
+export default function (colors, colorPool) {
   if (_.isArray(colors)) {
     colors = _(colors).flatMap(color => {
       if (_.isString(color)) {