refactor(utils): put in folder

src/utils/index.js

@@ -0,0 +1,8 @@
+export const isFunction = obj => !!(obj && obj.constructor && obj.call && obj.apply);
+
+export const isInputNode = e => e && e.target && ['INPUT', 'SELECT', 'TEXTAREA'].includes(e.target.nodeName);
+
+export const getDimensions = (node = {}) => ({
+  width: node.offsetWidth,
+  height: node.offsetHeight
+});