Fixing TS linter errors

declarations.d.ts

@@ -2,3 +2,9 @@ declare module "*.module.scss" {
   const classes: { [key: string]: string };
   export default classes;
 }
+
+declare module "react-transition-group/CSSTransition" {
+  import { ComponentType } from "react";
+  const CSSTransition: ComponentType<any>;
+  export default CSSTransition;
+}