fix(core): tsc errors

packages/core/src/components/CheckboxTree/CheckboxTree.stories.tsx

@@ -66,7 +66,7 @@ export default {
 
 export const Default = () => (
   <CheckboxTree
-    onChange={el => {}}
+    onChange={() => {}}
     label="default"
     subCategories={CHECKBOX_TREE_ITEMS}
   />

packages/core/src/components/Select/Select.stories.tsx

@@ -39,7 +39,7 @@ const SELECT_ITEMS = [
 
 export const Default = () => (
   <Select
-    onChange={el => {}}
+    onChange={() => {}}
     placeholder="All results"
     label="Default"
     items={SELECT_ITEMS}
@@ -52,6 +52,6 @@ export const Multiple = () => (
     label="Multiple"
     items={SELECT_ITEMS}
     multiple
-    onChange={el => {}}
+    onChange={() => {}}
   />
 );

packages/core/src/components/Select/Select.tsx

@@ -35,7 +35,6 @@ import {
 
 import ClosedDropdown from './static/ClosedDropdown';
 import OpenedDropdown from './static/OpenedDropdown';
-import { idea } from 'react-syntax-highlighter/dist/cjs/styles/hljs';
 
 const BootstrapInput = withStyles((theme: Theme) =>
   createStyles({