feat: move to let declarations

Author: mrmckeb

src/helpers/createExports.ts

@@ -8,7 +8,7 @@ const NOT_CAMELCASE_REGEXP = /[\-_]/;
 
 const classNameToProperty = (className: string) => `'${className}': string;`;
 const classNameToNamedExport = (className: string) =>
-  `export const ${className}: string;`;
+  `export let ${className}: string;`;
 
 const flattenClassNames = (
   previousValue: string[] = [],