diff --git a/lib/ColorField/index.js b/lib/ColorField/index.js
index ea7386e68..647fe98e5 100644
--- a/lib/ColorField/index.js
+++ b/lib/ColorField/index.js
@@ -205,7 +205,7 @@ const ColorField = forwardRef(({
     onChange({ value: state.value, valid: true });
   };
 
-  const onMouseUp_ = e => {
+  const onMouseUp_ = () => {
     /* istanbul ignore if: just in case */
     if (!state.handleMoving || !state.handleType || disabled || readOnly) {
       return;
diff --git a/lib/ColorField/index.test.js b/lib/ColorField/index.test.js
index a0d994440..13056f518 100644
--- a/lib/ColorField/index.test.js
+++ b/lib/ColorField/index.test.js
@@ -62,7 +62,7 @@ describe('<ColorField />', () => {
   it('should remove document events on unmount', () => {
     const map = {};
     document.addEventListener = (event, cb) => { map[event] = sinon.spy(cb); };
-    document.removeEventListener = (event, cb) => delete map[event];
+    document.removeEventListener = event => delete map[event];
 
     const component = mount(<ColorField globalEventsTarget={document} />);
     expect(map.mousemove).toBeDefined();
diff --git a/lib/utils/index.js b/lib/utils/index.js
index 28a16f664..90cd9a453 100644
--- a/lib/utils/index.js
+++ b/lib/utils/index.js
@@ -41,7 +41,7 @@ export const ensureNode = selectorOrNode => (
 
 export const COLOR_PARSERS = [{
   regex: /(rgb)a?\(\s*(\d{1,3})\s*,\s*(\d{1,3})\s*%?,\s*(\d{1,3})\s*%?(?:,\s*(\d+(?:\.\d+)?)\s*)?\)/,
-  parse: ([useless, alsoUseless, r, g, b, a]) => ({
+  parse: ([_useless, _alsoUseless, r, g, b, a]) => ({
     r: parseInt(r, 10) / 255,
     g: parseInt(g, 10) / 255,
     b: parseInt(b, 10) / 255,
@@ -49,7 +49,7 @@ export const COLOR_PARSERS = [{
   }),
 }, {
   regex: /(hsl)a?\(\s*(\d{1,3})\s*,\s*(\d{1,3})%\s*,\s*(\d{1,3})%\s*(?:,\s*(\d+(?:\.\d+)?)\s*)?\)/,
-  parse: ([useless, alsoUseless, h, s, l, a]) => ({
+  parse: ([_useless, _alsoUseless, h, s, l, a]) => ({
     h: parseInt(h, 10) / 360,
     s: parseInt(s, 10) / 100,
     l: parseInt(l, 10) / 100,
@@ -57,7 +57,7 @@ export const COLOR_PARSERS = [{
   }),
 }, {
   regex: /#([a-fA-F0-9]{2})([a-fA-F0-9]{2})([a-fA-F0-9]{2})$/,
-  parse: ([useless, r, g, b]) => ({
+  parse: ([_useless, r, g, b]) => ({
     r: parseInt(r, 16) / 255,
     g: parseInt(g, 16) / 255,
     b: parseInt(b, 16) / 255,
@@ -65,7 +65,7 @@ export const COLOR_PARSERS = [{
   }),
 }, {
   regex: /#([a-fA-F0-9])([a-fA-F0-9])([a-fA-F0-9])$/,
-  parse: ([useless, r, g, b]) => ({
+  parse: ([_useless, r, g, b]) => ({
     r: parseInt(r + r, 16) / 255,
     g: parseInt(g + g, 16) / 255,
     b: parseInt(b + b, 16) / 255,
@@ -191,7 +191,7 @@ export const rgba2hsva = ({ r, g, b, a = 0 } = {}) => {
   return { h, s, v, a };
 };
 
-export const rgba2hex = ({ r, g, b, a }) =>
+export const rgba2hex = ({ r, g, b }) =>
   '#' + ((1 << 24) | (r << 16) | (g << 8) | b).toString(16).substr(1);
 
 export const denormalizeHSLA = ({ h, s, l, a }) => ({
diff --git a/rollup.config.js b/rollup.config.js
index 23b3339d0..b1056c51e 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -50,11 +50,8 @@ export default [
       globals: defaultGlobals,
     },
     ...(f === 'esm' ? {
-      manualChunks: id => {
-        return id.includes('node_modules')
-          ? 'vendor'
-          : path.parse(id).name;
-      },
+      manualChunks: id =>
+        id.includes('node_modules') ? 'vendor' : path.parse(id).name,
     } : {}),
   })),
   {