Fix many eslint warnings

src/components/App.js

@@ -57,7 +57,7 @@ class App extends React.PureComponent<AppProps & Classes, AppState> {
       Object.assign({}, ...this.props.config.topics) : this.props.config.topics;
   }
 
-  static styles(_theme: Object) {
+  static styles() {
     return {
       drawerPaper: {
         width: 320
@@ -83,10 +83,9 @@ class App extends React.PureComponent<AppProps & Classes, AppState> {
       return;
     }
     for (let i in topics) {
-      // TODO: Remove FlowFixMe
       const topic = topics[i];
-      // $FlowFixMe
-      const parseValue = this.topics[topic].state.type;
+      const stateTopic = this.topics[topic].state;
+      const parseValue = stateTopic ? stateTopic.type : null;
       const val = parseValue == null ? message.toString() : parseValue(message);
       this.setState({mqttState: Object.assign({}, merge(this.state.mqttState,
         { [topic]: val}))});

src/components/SideBar.js

@@ -31,7 +31,7 @@ class SideBar extends React.PureComponent<Props, SideBarState> {
     super(props);
   }
 
-  static styles(_theme: Object): Object {
+  static styles(): Object {
     return {
       drawerPaper: {
         width: 340

src/components/UiItemList/UiItem.js

@@ -3,6 +3,7 @@ import React from "react";
 import keys from "lodash/keys";
 import map from "lodash/map";
 import debounce from "lodash/debounce";
+import { renderIcon } from "config/icon";
 import ListItemSecondaryAction from "@material-ui/core/ListItemSecondaryAction";
 import ListItemText from "@material-ui/core/ListItemText";
 import ListSubheader from "@material-ui/core/ListSubheader";
@@ -77,9 +78,9 @@ export class UiControl<I: UIControl> extends UiItem<I> {
 
   debouncedChange = debounce((next: string) =>
     this.props.onChangeState(this.props.item.topic, next), 50, {
-      leading: true,
-      trailing: true
-    });
+    leading: true,
+    trailing: true
+  });
 
   getValue() {
     const control = this.props.item;
@@ -216,6 +217,8 @@ export class Link extends UiItem<UILink> {
         color="primary"
         disabled={!this.isEnabled()}
       >
+        {this.props.item.icon == null ? ""
+          : renderIcon(this.props.item.icon(this.props.state), "mdi-24px")}
         {this.props.item.text}
       </Button>
     );

src/components/UiItemList/index.js

@@ -32,7 +32,7 @@ export default class UiItemList extends React.PureComponent<UiItemListProps> {
       }
       return (
         <ListItem key={key}>
-          {control.icon == null ||
+          {control.icon == null || control.type === "link" ||
             <ListItemIcon>
               {renderIcon(control.icon(this.props.state), "mdi-24px")}
             </ListItemIcon>}