add ScrollToTop

Author: MacKentoch

.eslintrc

@@ -4,10 +4,40 @@
     "browser": true,
     "node": true,
     "es6": true,
-    "mocha": true,
+    "mocha": true
   },
   "plugins": ["react"],
-
+  "extends": [
+      "plugin:react/recommended"
+  ],
+  // eslint > 2.x
+  "parserOptions": {
+    "ecmaFeatures": {
+      "arrowFunctions": true,
+      "binaryLiterals": true,
+      "blockBindings": true,
+      "classes": true,
+      "defaultParams": true,
+      "destructuring": true,
+      "forOf": true,
+      "generators": true,
+      "modules": true,
+      "objectLiteralComputedProperties": true,
+      "objectLiteralDuplicateProperties": true,
+      "objectLiteralShorthandMethods": true,
+      "objectLiteralShorthandProperties": true,
+      "octalLiterals": true,
+      "regexUFlag": true,
+      "regexYFlag": true,
+      "spread": true,
+      "superInFunctions": true,
+      "templateStrings": true,
+      "unicodeCodePointEscapes": true,
+      "globalReturn": true,
+      "jsx": true
+    }
+  },
+  // eslint 1.x
   "ecmaFeatures": {
     "arrowFunctions": true,
     "binaryLiterals": true,

src/app/components/backToTop/BackToTop.js

@@ -47,7 +47,7 @@ class BackToTop extends Component {
     return (
       <Motion style={{x: spring(showBackButton ? 0 : 120, presets.stiff)}}>
         {
-          ({x}) =>
+          ({x}) => (
             <BackToTopButton
               position={'bottom-right'}
               onClick={this.handlesOnBackButtonClick}
@@ -56,6 +56,7 @@ class BackToTop extends Component {
                 transform: `translate3d(${x}px, 0, 0)`
               }}
             />
+          )
         }
       </Motion>
     );

src/app/components/backToTop/backToTopButton/UpIcon.js

@@ -1,5 +1,3 @@
-// @flow weak
-
 import React        from 'react';
 import PropTypes    from 'prop-types';
 

src/app/components/backToTop/lib/smoothScroll.js

@@ -1,5 +1,3 @@
-// @flow weak
-
 import { isBrowserSide }  from '../../../services/universal';
 
 export const smoothScroll = {

src/app/components/scrollToTop/ScrollToTop.js

@@ -0,0 +1,30 @@
+// @flow weak
+
+import React, {
+  PureComponent
+}                 from 'react';
+import PropTypes  from 'prop-types';
+
+class ScrollToTop extends PureComponent {
+  static propTypes = {
+    children: PropTypes.node,
+    location: PropTypes.string
+  };
+
+  componentDidUpdate(prevProps) {
+    if (this.props.location !== prevProps.location) {
+      window.scrollTo(0, 0);
+    }
+  }
+
+  render() {
+    const { children } = this.props;
+    return (
+      <div>
+        { children }
+      </div>
+    );
+  }
+}
+
+export default ScrollToTop;