Installed TS and updated linter

src/servers/helpers/ImportServersBtn.js

@@ -10,7 +10,7 @@ const propTypes = {
 
 // FIXME Replace with typescript: (ServersImporter)
 const ImportServersBtn = ({ importServersFromFile }) => {
-  const ImportServersBtnComp = ({ createServers, fileRef, onImport = () => {} }) => {
+  const ImportServersBtnComp = ({ createServers, fileRef, onImport = () => '' }) => {
     const ref = fileRef || useRef();
     const onChange = ({ target }) =>
       importServersFromFile(target.files[0])

src/utils/services/ColorGenerator.js

@@ -33,7 +33,7 @@ export default class ColorGenerator {
     this.storage.set('colors', this.colors);
 
     return color;
-  }
+  };
 }
 
 export const colorGeneratorType = PropTypes.shape({

src/visits/helpers/LineChartCard.js

@@ -106,14 +106,14 @@ const generateDataset = (stats, label, color) => ({
 
 const LineChartCard = ({ title, visits, highlightedVisits, highlightedLabel = 'Selected' }) => {
   const [ step, setStep ] = useState(
-    visits.length > 0 ? determineInitialStep(visits[visits.length - 1].date) : 'monthly'
+    visits.length > 0 ? determineInitialStep(visits[visits.length - 1].date) : 'monthly',
   );
   const [ skipNoVisits, toggleSkipNoVisits ] = useToggle(true);
 
   const groupedVisitsWithGaps = useMemo(() => groupVisitsByStep(step, reverse(visits)), [ step, visits ]);
   const [ labels, groupedVisits ] = useMemo(
     () => generateLabelsAndGroupedVisits(visits, groupedVisitsWithGaps, step, skipNoVisits),
-    [ visits, step, skipNoVisits ]
+    [ visits, step, skipNoVisits ],
   );
   const groupedHighlighted = useMemo(
     () => fillTheGaps(groupVisitsByStep(step, reverse(highlightedVisits)), labels),