remove unused code

src/validate/js/propValidators/preload.ts

@@ -1,13 +1,6 @@
 import { Validator } from '../../';
 import { Node } from '../../../interfaces';
 
-const validTypes = new Set([
-	'FunctionExpression',
-	'ArrowFunctionExpression',
-	'Identifier',
-	'MemberExpression'
-]);
-
 export default function preload(validator: Validator, prop: Node) {
 	// not sure there's anything we need to check here...
 }