From 8a05002a53fb975d6981dd7cb207ee4d331d57a4 Mon Sep 17 00:00:00 2001
From: Rich Harris <git@rich-harris.dev>
Date: Thu, 23 Mar 2023 11:09:54 -0400
Subject: [PATCH] disallow directories being created in place of files and vice
 versa

---
 src/routes/tutorial/[slug]/filetree/Filetree.svelte | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/routes/tutorial/[slug]/filetree/Filetree.svelte b/src/routes/tutorial/[slug]/filetree/Filetree.svelte
index 989a23b27..87773164c 100644
--- a/src/routes/tutorial/[slug]/filetree/Filetree.svelte
+++ b/src/routes/tutorial/[slug]/filetree/Filetree.svelte
@@ -29,7 +29,14 @@
 		collapsed,
 
 		add: async (name, type) => {
-			if (!$solution[name] && !exercise.editing_constraints.create.has(name)) {
+			const expected = $solution[name];
+
+			if (type !== expected.type) {
+				modal_text = `${name.slice(exercise.scope.prefix.length)} should be a ${expected.type}, not a ${type}!`;
+				return;
+			}
+
+			if (!expected && !exercise.editing_constraints.create.has(name)) {
 				modal_text =
 					'Only the following files and folders are allowed to be created in this exercise:\n' +
 					Array.from(exercise.editing_constraints.create).join('\n');