fix: inconsistent editor state for empty values (#520)

Author: gtm-nayan

.changeset/five-sloths-jam.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/repl': patch
+---
+
+fix: inconsistent editor state for empty values

packages/repl/src/lib/CodeMirror.svelte

@@ -15,7 +15,7 @@
 	/** @type {import('./types').StartOrEnd | null} */
 	export let errorLoc = null;
 
-	/** @type {import('@codemirror/lint').LintSource>} */
+	/** @type {import('@codemirror/lint').LintSource} */
 	export let diagnostics;
 
 	export let readonly = false;
@@ -52,7 +52,7 @@
 			lang = options.lang;
 		}
 
-		if (options.code) {
+		if (options.code !== undefined) {
 			updating_externally = true;
 
 			const { scrollLeft: left, scrollTop: top } = $cmInstance.view.scrollDOM;