disallow new lines

packages/utils/src/helpers.ts

@@ -25,7 +25,15 @@ export function isDocumentString(str: any): boolean {
   return false;
 }
 
-const invalidPathRegex = /[‘“!%^<>`]/;
+const invalidPathRegex = /[‘“!%^<>`\n]/;
+/**
+ * Checkes whether the `str` contains any path illegal characters.
+ *
+ * A string may sometimes look like a path but is not (like an SDL of a simple
+ * GraphQL schema). To make sure we don't yield false-positives in such cases,
+ * we disallow new lines in paths (even thouhg most Unix systems support new
+ * lines in file names).
+ */
 export function isValidPath(str: any): boolean {
   return typeof str === 'string' && !invalidPathRegex.test(str);
 }