Fix lint errors

browser/main/modals/PreferencesModal/InfoTab.js

@@ -31,7 +31,7 @@ class InfoTab extends React.Component {
   }
 
   handleSaveButtonClick (e) {
-    let newConfig = {
+    const newConfig = {
       amaEnabled: this.state.config.amaEnabled
     }
 
@@ -140,7 +140,7 @@ class InfoTab extends React.Component {
         <div styleName='policy'>Analytics</div>
         <div>Boostnote collects anonymous data for the sole purpose of improving the application, and strictly does not collect any personal information such the contents of your notes.</div>
         <div>You can see how it works on <a href='https://github.com/BoostIO/Boostnote' onClick={(e) => this.handleLinkClick(e)}>GitHub</a>.</div>
-        <br/>
+        <br />
         <div>You can choose to enable or disable this option.</div>
         <input onChange={(e) => this.handleConfigChange(e)}
           checked={this.state.config.amaEnabled}
@@ -149,7 +149,7 @@ class InfoTab extends React.Component {
         />
         Enable analytics to help improve Boostnote<br />
         <button styleName='policy-submit' onClick={(e) => this.handleSaveButtonClick(e)}>Save</button>
-        <br/>
+        <br />
         {this.infoMessage()}
       </div>
     )

browser/main/modals/PreferencesModal/StoragesTab.js

@@ -167,7 +167,7 @@ class StoragesTab extends React.Component {
                 <option value='FILESYSTEM'>File System</option>
               </select>
               <div styleName='addStorage-body-section-type-description'>
-                Setting up 3rd-party cloud storage integration: 
+                Setting up 3rd-party cloud storage integration:{' '}
                 <a href='https://github.com/BoostIO/Boostnote/wiki/Cloud-Syncing-and-Backup'
                   onClick={(e) => this.handleLinkClick(e)}
                 >Cloud-Syncing-and-Backup</a>

browser/main/modals/PreferencesModal/index.js

@@ -1,6 +1,5 @@
 import PropTypes from 'prop-types'
 import React from 'react'
-import ReactDOM from 'react-dom'
 import { connect } from 'react-redux'
 import HotkeyTab from './HotkeyTab'
 import UiTab from './UiTab'
@@ -11,6 +10,7 @@ import ModalEscButton from 'browser/components/ModalEscButton'
 import CSSModules from 'browser/lib/CSSModules'
 import styles from './PreferencesModal.styl'
 import RealtimeNotification from 'browser/components/RealtimeNotification'
+import _ from 'lodash'
 
 class Preferences extends React.Component {
   constructor (props) {
@@ -94,8 +94,8 @@ class Preferences extends React.Component {
   }
 
   getContentBoundingBox () {
-    const node = ReactDOM.findDOMNode(this.refs.content)
-    return node.getBoundingClientRect()
+    console.log(this.refs.content.getBoundingClientRect())
+    return this.refs.content.getBoundingClientRect()
   }
 
   haveToSaveNotif (type, message) {