Fix regression in v6 (#15)

Author: kellyselden

index.js

@@ -1,12 +1,12 @@
 import path from 'node:path';
 import {findUp, findUpSync} from 'find-up';
 
-export async function packageDirectory({cwd}) {
+export async function packageDirectory({cwd} = {}) {
 	const filePath = await findUp('package.json', {cwd});
 	return filePath && path.dirname(filePath);
 }
 
-export function packageDirectorySync({cwd}) {
+export function packageDirectorySync({cwd} = {}) {
 	const filePath = findUpSync('package.json', {cwd});
 	return filePath && path.dirname(filePath);
 }