Use String instead of toString

Author: y-hsgw

lib/rules/forbid-elements.js

@@ -106,7 +106,7 @@ module.exports = {
 
         if (argument.type === 'Identifier' && /^[A-Z_]/.test(argument.name)) {
           reportIfForbidden(argument.name, argument);
-        } else if (argument.type === 'Literal' && /^[a-z][^.]*$/.test(argument.value.toString())) {
+        } else if (argument.type === 'Literal' && /^[a-z][^.]*$/.test(String(argument.value))) {
           reportIfForbidden(argument.value, argument);
         } else if (argument.type === 'MemberExpression') {
           reportIfForbidden(context.getSourceCode().getText(argument), argument);