add no-unused and react/recommended to eslint (#1523)

* add no-unused-vars and no-unused-imports

* added quotes: double, and remove ignore pattern

* move itif and describeif into utils

Signed-off-by: Sebastian Malton <sebastian@malton.name>

src/renderer/components/clipboard/clipboard.tsx

@@ -25,6 +25,7 @@ export class Clipboard extends React.Component<CopyToClipboardProps> {
   static defaultProps = defaultProps as object;
 
   get rootElem(): HTMLElement {
+    // eslint-disable-next-line react/no-find-dom-node
     return findDOMNode(this) as HTMLElement;
   }
 
@@ -59,4 +60,4 @@ export class Clipboard extends React.Component<CopyToClipboardProps> {
       return this.rootReactElem;
     }
   }
-}
+}