diff --git a/packages/repl/src/lib/workers/bundler/index.ts b/packages/repl/src/lib/workers/bundler/index.ts
index 6e84324a03..115f4eeed3 100644
--- a/packages/repl/src/lib/workers/bundler/index.ts
+++ b/packages/repl/src/lib/workers/bundler/index.ts
@@ -443,7 +443,8 @@ async function get_bundle(
 			glsl,
 			loop_protect,
 			replace({
-				'process.env.NODE_ENV': JSON.stringify('production')
+				'process.env.NODE_ENV': JSON.stringify('production'),
+				'import.meta.env.MODE': JSON.stringify('development')
 			}),
 			{
 				name: 'css',
diff --git a/packages/repl/src/lib/workers/npm.ts b/packages/repl/src/lib/workers/npm.ts
index 57710a3daa..10abe6f312 100644
--- a/packages/repl/src/lib/workers/npm.ts
+++ b/packages/repl/src/lib/workers/npm.ts
@@ -199,7 +199,10 @@ export function resolve_subpath(pkg: Package, subpath: string): string {
 }
 
 export function normalize_path(pkg: Package, path: string, importee: string, importer: string) {
-	for (const suffix of ['', '.js', '.mjs', '.cjs', '/index.js', '/index.mjs', '/index.cjs']) {
+	const suffixes = path.endsWith('/')
+		? ['index.js', 'index.mjs', 'index.cjs']
+		: ['', '.js', '.mjs', '.cjs', '/index.js', '/index.mjs', '/index.cjs'];
+	for (const suffix of suffixes) {
 		let with_suffix = path + suffix;
 
 		if (pkg.meta.browser) {