From 7b7a7633ff28c5bef08d70d6ad0b4f7fcf579f37 Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Fri, 10 Nov 2023 16:58:42 -0500
Subject: [PATCH 1/4] simplify a whole bunch of stuff

---
 .../src/lib/Output/Compiler.js                |  4 +-
 .../src/lib/Output/Output.svelte              | 78 +++++--------------
 sites/svelte-5-preview/src/lib/Repl.svelte    | 51 ++++--------
 sites/svelte-5-preview/src/lib/types.d.ts     |  2 -
 .../src/lib/workers/compiler/index.js         |  8 +-
 5 files changed, 42 insertions(+), 101 deletions(-)

diff --git a/sites/svelte-5-preview/src/lib/Output/Compiler.js b/sites/svelte-5-preview/src/lib/Output/Compiler.js
index dcb70df4cef6..da11186a2f15 100644
--- a/sites/svelte-5-preview/src/lib/Output/Compiler.js
+++ b/sites/svelte-5-preview/src/lib/Output/Compiler.js
@@ -40,9 +40,9 @@ export default class Compiler {
 
 	/**
 	 * @param {import('$lib/types').File} file
-	 * @param {import('svelte/types/compiler').CompileOptions} options
+	 * @param {import('svelte/compiler').CompileOptions} options
 	 * @param {boolean} return_ast
-	 * @returns
+	 * @returns {Promise<import('$lib/workers/workers').CompileMessageData>}
 	 */
 	compile(file, options, return_ast) {
 		return new Promise((fulfil) => {
diff --git a/sites/svelte-5-preview/src/lib/Output/Output.svelte b/sites/svelte-5-preview/src/lib/Output/Output.svelte
index 0fec790e8454..b3bdee8d89c2 100644
--- a/sites/svelte-5-preview/src/lib/Output/Output.svelte
+++ b/sites/svelte-5-preview/src/lib/Output/Output.svelte
@@ -1,16 +1,12 @@
 <script>
 	import { get_repl_context } from '$lib/context.js';
-	import { BROWSER } from 'esm-env';
 	import { marked } from 'marked';
 	import CodeMirror from '../CodeMirror.svelte';
 	import AstView from './AstView.svelte';
-	import Compiler from './Compiler.js';
 	import CompilerOptions from './CompilerOptions.svelte';
 	import PaneWithPanel from './PaneWithPanel.svelte';
 	import Viewer from './Viewer.svelte';
 
-	export let svelteUrl;
-
 	/** @type {string | null} */
 	export let status;
 
@@ -35,62 +31,29 @@
 	/** @type {'light' | 'dark'} */
 	export let previewTheme;
 
-	/**
-	 * @param {import('$lib/types').File} file
-	 * @param {import('svelte/compiler').CompileOptions} options
-	 */
-	export async function set(file, options) {
-		selected_type = file.type;
+	/** @type {import('../types').File | null} */
+	export let selected;
+
+	/** @type {import('../workers/workers').CompileMessageData | null} */
+	export let compiled;
 
-		if (file.type === 'json') {
+	$: if (selected) {
+		if (selected.type === 'json') {
 			js_editor.set({ code: `/* Select a component to see its compiled code */`, lang: 'js' });
 			css_editor.set({ code: `/* Select a component to see its compiled code */`, lang: 'css' });
-			return;
-		}
-
-		if (file.type === 'md') {
-			markdown = marked(file.source);
-			return;
 		}
 
-		if (!compiler) return console.error('Compiler not initialized.');
-
-		const compiled = await compiler.compile(file, options, showAst);
-		if (!js_editor) return; // unmounted
-
-		js_editor.set({
-			code: compiled.js,
-			lang: 'js'
-		});
-		css_editor.set({ code: compiled.css, lang: 'css' });
-		ast = compiled.ast;
-	}
-
-	/**
-	 * @param {import('$lib/types').File} selected
-	 * @param {import('svelte/compiler').CompileOptions} options
-	 */
-	export async function update(selected, options) {
-		if (selected.type === 'json') return;
-
-		if (selected.type === 'md') {
+		else if (selected.type=== 'md') {
 			markdown = marked(selected.source);
-			return;
 		}
 
-		if (!compiler) return console.error('Compiler not initialized.');
-
-		const { result, metadata } = await compiler.compile(selected, options, showAst);
-
-		js_editor.update({ code: result.js, lang: 'js' });
-		css_editor.update({ code: result.css, lang: 'css' });
-		$runes_mode = metadata?.runes;
-		ast = result.ast;
+		else if (compiled) {
+			js_editor.set({ code: compiled.result.js, lang: 'js' });
+			css_editor.set({ code: compiled.result.css, lang: 'css' });
+		}
 	}
 
-	const { module_editor, runes_mode } = get_repl_context();
-
-	const compiler = BROWSER ? new Compiler(svelteUrl) : null;
+	const { module_editor } = get_repl_context();
 
 	/** @type {CodeMirror} */
 	let js_editor;
@@ -100,7 +63,6 @@
 
 	/** @type {'result' | 'js' | 'css' | 'ast'} */
 	let view = 'result';
-	let selected_type = '';
 	let markdown = '';
 
 	/** @type {import('svelte/types/compiler/interfaces').Ast} */
@@ -108,7 +70,7 @@
 </script>
 
 <div class="view-toggle">
-	{#if selected_type === 'md'}
+	{#if selected?.type === 'md'}
 		<button class="active">Markdown</button>
 	{:else}
 		<button class:active={view === 'result'} on:click={() => (view = 'result')}>Result</button>
@@ -121,7 +83,7 @@
 </div>
 
 <!-- component viewer -->
-<div class="tab-content" class:visible={selected_type !== 'md' && view === 'result'}>
+<div class="tab-content" class:visible={selected?.type !== 'md' && view === 'result'}>
 	<Viewer
 		bind:error={runtimeError}
 		{status}
@@ -133,7 +95,7 @@
 </div>
 
 <!-- js output -->
-<div class="tab-content" class:visible={selected_type !== 'md' && view === 'js'}>
+<div class="tab-content" class:visible={selected?.type !== 'md' && view === 'js'}>
 	{#if embedded}
 		<CodeMirror bind:this={js_editor} errorLoc={sourceErrorLoc} readonly />
 	{:else}
@@ -150,22 +112,22 @@
 </div>
 
 <!-- css output -->
-<div class="tab-content" class:visible={selected_type !== 'md' && view === 'css'}>
+<div class="tab-content" class:visible={selected?.type !== 'md' && view === 'css'}>
 	<CodeMirror bind:this={css_editor} errorLoc={sourceErrorLoc} readonly />
 </div>
 
 <!-- ast output -->
 {#if showAst}
-	<div class="tab-content" class:visible={selected_type !== 'md' && view === 'ast'}>
+	<div class="tab-content" class:visible={selected?.type !== 'md' && view === 'ast'}>
 		<!-- ast view interacts with the module editor, wait for it first -->
 		{#if $module_editor}
-			<AstView {ast} autoscroll={selected_type !== 'md' && view === 'ast'} />
+			<AstView {ast} autoscroll={selected?.type !== 'md' && view === 'ast'} />
 		{/if}
 	</div>
 {/if}
 
 <!-- markdown output -->
-<div class="tab-content" class:visible={selected_type === 'md'}>
+<div class="tab-content" class:visible={selected?.type === 'md'}>
 	<iframe title="Markdown" srcdoc={markdown} />
 </div>
 
diff --git a/sites/svelte-5-preview/src/lib/Repl.svelte b/sites/svelte-5-preview/src/lib/Repl.svelte
index 5484ce651b46..67d927374e2d 100644
--- a/sites/svelte-5-preview/src/lib/Repl.svelte
+++ b/sites/svelte-5-preview/src/lib/Repl.svelte
@@ -11,6 +11,7 @@
 	import Output from './Output/Output.svelte';
 	import { set_repl_context } from './context.js';
 	import { get_full_filename } from './utils.js';
+	import Compiler from './Output/Compiler.js';
 
 	export let packagesUrl = 'https://unpkg.com';
 	export let svelteUrl = `${BROWSER ? location.origin : ''}/svelte`;
@@ -64,32 +65,6 @@
 		$files = $files.map((val) => ({ ...val, modified: false }));
 	}
 
-	/** @param {{ files: import('./types').File[], css?: string }} data */
-	export function update(data) {
-		$files = data.files;
-
-		const matched_file = data.files.find((file) => get_full_filename(file) === $selected_name);
-
-		$selected_name = matched_file ? get_full_filename(matched_file) : 'App.svelte';
-
-		injectedCSS = data.css ?? '';
-
-		if (matched_file) {
-			$module_editor?.update({
-				code: matched_file.source,
-				lang: matched_file.type
-			});
-
-			$output?.update?.(matched_file, $compile_options);
-
-			$module_editor?.clearEditorState();
-		}
-
-		populate_editor_state();
-
-		dispatch('change', { files: $files });
-	}
-
 	/** @type {ReturnType<typeof createEventDispatcher<{ change: { files: import('./types').File[] } }>>} */
 	const dispatch = createEventDispatcher();
 
@@ -135,9 +110,6 @@
 	/** @type {ReplContext['module_editor']} */
 	const module_editor = writable(null);
 
-	/** @type {ReplContext['output']} */
-	const output = writable(null);
-
 	/** @type {ReplContext['toggleable']} */
 	const toggleable = writable(false);
 
@@ -160,7 +132,6 @@
 		compile_options,
 		cursor_pos,
 		module_editor,
-		output,
 		toggleable,
 		runes_mode,
 
@@ -206,8 +177,6 @@
 			$module_editor?.clearEditorState();
 		}
 
-		$output?.set($selected, $compile_options);
-
 		is_select_changing = false;
 	}
 
@@ -273,8 +242,18 @@
 		}
 	}
 
-	$: if ($output && $selected) {
-		$output?.update?.($selected, $compile_options);
+	const compiler = BROWSER ? new Compiler(svelteUrl) : null;
+
+	/** @type {import('./workers/workers').CompileMessageData | null} */
+	let compiled = null;
+
+	$: if (compiler && $selected) {
+		if ($selected.type === 'svelte' || $selected.type === 'js') {
+			compiler.compile($selected, $compile_options, false).then((data) => {
+				compiled = data;
+				$runes_mode = data.metadata?.runes ?? false;
+			});
+		}
 	}
 
 	$: mobile = width < 540;
@@ -347,8 +326,6 @@
 
 			<section slot="b" style="height: 100%;">
 				<Output
-					bind:this={$output}
-					{svelteUrl}
 					status={status_visible ? status : null}
 					{embedded}
 					{relaxed}
@@ -356,6 +333,8 @@
 					{injectedCSS}
 					{showAst}
 					{previewTheme}
+					selected={$selected}
+					{compiled}
 				/>
 			</section>
 		</SplitPane>
diff --git a/sites/svelte-5-preview/src/lib/types.d.ts b/sites/svelte-5-preview/src/lib/types.d.ts
index 7c8a44446369..1add64c0efbb 100644
--- a/sites/svelte-5-preview/src/lib/types.d.ts
+++ b/sites/svelte-5-preview/src/lib/types.d.ts
@@ -47,7 +47,6 @@ export type ReplState = {
 	cursor_pos: number;
 	toggleable: boolean;
 	module_editor: import('./CodeMirror.svelte').default | null;
-	output: import('./Output/Output.svelte').default | null;
 	runes_mode: boolean;
 };
 
@@ -62,7 +61,6 @@ export type ReplContext = {
 	cursor_pos: Writable<ReplState['cursor_pos']>;
 	toggleable: Writable<ReplState['toggleable']>;
 	module_editor: Writable<ReplState['module_editor']>;
-	output: Writable<ReplState['output']>;
 	runes_mode: Writable<ReplState['runes_mode']>;
 
 	EDITOR_STATE_MAP: Map<string, EditorState>;
diff --git a/sites/svelte-5-preview/src/lib/workers/compiler/index.js b/sites/svelte-5-preview/src/lib/workers/compiler/index.js
index a6cd935d03c6..ff2c904136e7 100644
--- a/sites/svelte-5-preview/src/lib/workers/compiler/index.js
+++ b/sites/svelte-5-preview/src/lib/workers/compiler/index.js
@@ -62,13 +62,14 @@ function compile({ id, source, options, return_ast }) {
 				generate: options.generate
 			});
 
-			const { js, css, metadata } = compiled;
+			const { js, css, warnings, metadata } = compiled;
 
 			return {
 				id,
 				result: {
 					js: js.code,
-					css: css?.code || `/* Add a <sty` + `le> tag to see compiled CSS */`
+					css: css?.code || `/* Add a <sty` + `le> tag to see compiled CSS */`,
+					warnings
 				},
 				metadata
 			};
@@ -83,7 +84,8 @@ function compile({ id, source, options, return_ast }) {
 					id,
 					result: {
 						js: compiled.js.code,
-						css
+						css,
+						warnings: compiled.warnings
 					},
 					metadata: compiled.metadata
 				};

From 9b3c38b1167992b416c1255747f90a0aec641c0c Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Fri, 10 Nov 2023 17:02:07 -0500
Subject: [PATCH 2/4] delete more unused stuff

---
 .../src/lib/CodeMirror.svelte                 | 28 ++++---------------
 .../src/lib/Input/ModuleEditor.svelte         |  4 ---
 .../src/lib/Output/Output.svelte              |  9 ++----
 sites/svelte-5-preview/src/lib/Repl.svelte    |  4 +--
 4 files changed, 9 insertions(+), 36 deletions(-)

diff --git a/sites/svelte-5-preview/src/lib/CodeMirror.svelte b/sites/svelte-5-preview/src/lib/CodeMirror.svelte
index f926d32f969d..6ec16356e5eb 100644
--- a/sites/svelte-5-preview/src/lib/CodeMirror.svelte
+++ b/sites/svelte-5-preview/src/lib/CodeMirror.svelte
@@ -12,9 +12,6 @@
 	import Message from './Message.svelte';
 	import { svelteTheme } from './theme.js';
 
-	/** @type {import('./types').StartOrEnd | null} */
-	export let errorLoc = null;
-
 	/** @type {import('@codemirror/lint').LintSource | undefined} */
 	export let diagnostics = undefined;
 
@@ -171,9 +168,6 @@
 
 	let marked = false;
 
-	/** @type {number | null}*/
-	let error_line = null;
-
 	let updating_externally = false;
 
 	/** @type {import('@codemirror/state').Extension[]} */
@@ -181,27 +175,15 @@
 
 	let cursor_pos = 0;
 
-	$: {
-		if ($cmInstance.view) {
-			fulfil_module_editor_ready();
-		}
+	$: if ($cmInstance.view) {
+		fulfil_module_editor_ready();
 	}
 
 	$: if ($cmInstance.view && w && h) resize();
 
-	$: {
-		if (marked) {
-			unmarkText();
-			marked = false;
-		}
-
-		if (errorLoc) {
-			markText({ from: errorLoc.character, to: errorLoc.character + 1, className: 'error-loc' });
-
-			error_line = errorLoc.line;
-		} else {
-			error_line = null;
-		}
+	$: if (marked) {
+		unmarkText();
+		marked = false;
 	}
 
 	const watcher = EditorView.updateListener.of((viewUpdate) => {
diff --git a/sites/svelte-5-preview/src/lib/Input/ModuleEditor.svelte b/sites/svelte-5-preview/src/lib/Input/ModuleEditor.svelte
index ded9816bd886..b18263535006 100644
--- a/sites/svelte-5-preview/src/lib/Input/ModuleEditor.svelte
+++ b/sites/svelte-5-preview/src/lib/Input/ModuleEditor.svelte
@@ -3,9 +3,6 @@
 	import { get_full_filename } from '$lib/utils.js';
 	import CodeMirror from '../CodeMirror.svelte';
 
-	/** @type {import('$lib/types').StartOrEnd | null} */
-	export let errorLoc = null;
-
 	/** @type {boolean} */
 	export let autocomplete;
 
@@ -58,7 +55,6 @@
 	<div class="editor notranslate" translate="no">
 		<CodeMirror
 			bind:this={$module_editor}
-			{errorLoc}
 			{autocomplete}
 			diagnostics={$selected && $bundle ? diagnostics : () => []}
 			on:change={handle_change}
diff --git a/sites/svelte-5-preview/src/lib/Output/Output.svelte b/sites/svelte-5-preview/src/lib/Output/Output.svelte
index b3bdee8d89c2..3b6f371787c8 100644
--- a/sites/svelte-5-preview/src/lib/Output/Output.svelte
+++ b/sites/svelte-5-preview/src/lib/Output/Output.svelte
@@ -10,9 +10,6 @@
 	/** @type {string | null} */
 	export let status;
 
-	/** @type {import('$lib/types').StartOrEnd | null} */
-	export let sourceErrorLoc = null;
-
 	/** @type {import('$lib/types').MessageDetails | null} */
 	export let runtimeError = null;
 
@@ -97,11 +94,11 @@
 <!-- js output -->
 <div class="tab-content" class:visible={selected?.type !== 'md' && view === 'js'}>
 	{#if embedded}
-		<CodeMirror bind:this={js_editor} errorLoc={sourceErrorLoc} readonly />
+		<CodeMirror bind:this={js_editor} readonly />
 	{:else}
 		<PaneWithPanel pos="50%" panel="Compiler options">
 			<div slot="main">
-				<CodeMirror bind:this={js_editor} errorLoc={sourceErrorLoc} readonly />
+				<CodeMirror bind:this={js_editor} readonly />
 			</div>
 
 			<div slot="panel-body">
@@ -113,7 +110,7 @@
 
 <!-- css output -->
 <div class="tab-content" class:visible={selected?.type !== 'md' && view === 'css'}>
-	<CodeMirror bind:this={css_editor} errorLoc={sourceErrorLoc} readonly />
+	<CodeMirror bind:this={css_editor} readonly />
 </div>
 
 <!-- ast output -->
diff --git a/sites/svelte-5-preview/src/lib/Repl.svelte b/sites/svelte-5-preview/src/lib/Repl.svelte
index 67d927374e2d..5ab0390e49d2 100644
--- a/sites/svelte-5-preview/src/lib/Repl.svelte
+++ b/sites/svelte-5-preview/src/lib/Repl.svelte
@@ -260,8 +260,6 @@
 
 	$: $toggleable = mobile && orientation === 'columns';
 
-	/** @type {import('./types').StartOrEnd} */
-	let sourceErrorLoc;
 	let width = 0;
 	let show_output = false;
 
@@ -321,7 +319,7 @@
 		>
 			<section slot="a">
 				<ComponentSelector show_modified={showModified} on:add on:remove />
-				<ModuleEditor errorLoc={sourceErrorLoc} {autocomplete} />
+				<ModuleEditor {autocomplete} />
 			</section>
 
 			<section slot="b" style="height: 100%;">

From 27d556c398acd2db969f30688893f992987332c1 Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Fri, 10 Nov 2023 17:23:12 -0500
Subject: [PATCH 3/4] fix diagnostics

---
 .../src/lib/Input/ModuleEditor.svelte         | 69 ++++++++-----------
 sites/svelte-5-preview/src/lib/Repl.svelte    | 18 +++--
 .../src/lib/workers/compiler/index.js         | 27 +++++---
 3 files changed, 59 insertions(+), 55 deletions(-)

diff --git a/sites/svelte-5-preview/src/lib/Input/ModuleEditor.svelte b/sites/svelte-5-preview/src/lib/Input/ModuleEditor.svelte
index b18263535006..3bd6ebdb5f1e 100644
--- a/sites/svelte-5-preview/src/lib/Input/ModuleEditor.svelte
+++ b/sites/svelte-5-preview/src/lib/Input/ModuleEditor.svelte
@@ -1,54 +1,21 @@
 <script>
 	import { get_repl_context } from '$lib/context.js';
-	import { get_full_filename } from '$lib/utils.js';
 	import CodeMirror from '../CodeMirror.svelte';
 
 	/** @type {boolean} */
 	export let autocomplete;
 
+	/** @type {any} */ // TODO
+	export let error;
+
+	/** @type {any[]} */ // TODO
+	export let warnings;
+
 	export function focus() {
 		$module_editor?.focus();
 	}
 
-	const { bundle, handle_change, module_editor, selected, bundling } = get_repl_context();
-
-	async function diagnostics() {
-		/** @type {import('@codemirror/lint').Diagnostic[]} */
-		const diagnostics = [];
-
-		if (!$selected || !$bundle) return diagnostics;
-
-		await $bundling;
-
-		const filename = get_full_filename($selected);
-
-		if (
-			$bundle.error &&
-			$bundle.error.filename === filename &&
-			$bundle.error.start &&
-			$bundle.error.end
-		) {
-			diagnostics.push({
-				from: $bundle.error.start.character,
-				to: $bundle.error.end.character,
-				severity: 'error',
-				message: $bundle.error.message
-			});
-		}
-
-		for (const warning of $bundle.warnings) {
-			if (warning.filename === filename) {
-				diagnostics.push({
-					from: warning.start.character,
-					to: warning.end.character,
-					severity: 'warning',
-					message: warning.message
-				});
-			}
-		}
-
-		return diagnostics;
-	}
+	const { handle_change, module_editor } = get_repl_context();
 </script>
 
 <div class="editor-wrapper">
@@ -56,7 +23,27 @@
 		<CodeMirror
 			bind:this={$module_editor}
 			{autocomplete}
-			diagnostics={$selected && $bundle ? diagnostics : () => []}
+			diagnostics={() => {
+				if (error) {
+					return [{
+						severity: 'error',
+						from: error.position[0],
+						to: error.position[1],
+						message: error.message
+					}];
+				}
+
+				if (warnings) {
+					return warnings.map((warning) => ({
+						severity: 'warning',
+						from: warning.start.character,
+						to: warning.end.character,
+						message: warning.message,
+					}));
+				}
+
+				return [];
+			}}
 			on:change={handle_change}
 		/>
 	</div>
diff --git a/sites/svelte-5-preview/src/lib/Repl.svelte b/sites/svelte-5-preview/src/lib/Repl.svelte
index 5ab0390e49d2..51f621c91a50 100644
--- a/sites/svelte-5-preview/src/lib/Repl.svelte
+++ b/sites/svelte-5-preview/src/lib/Repl.svelte
@@ -247,15 +247,21 @@
 	/** @type {import('./workers/workers').CompileMessageData | null} */
 	let compiled = null;
 
-	$: if (compiler && $selected) {
+	/**
+	 * @param {import('./types').File | null} $selected
+	 * @param {import('svelte/compiler').CompileOptions} $compile_options
+	 */
+	async function recompile($selected, $compile_options) {
+		if (!compiler || !$selected) return;
+
 		if ($selected.type === 'svelte' || $selected.type === 'js') {
-			compiler.compile($selected, $compile_options, false).then((data) => {
-				compiled = data;
-				$runes_mode = data.metadata?.runes ?? false;
-			});
+			compiled = await compiler.compile($selected, $compile_options, false);
+			$runes_mode = compiled.metadata?.runes ?? false;
 		}
 	}
 
+	$: recompile($selected, $compile_options);
+
 	$: mobile = width < 540;
 
 	$: $toggleable = mobile && orientation === 'columns';
@@ -319,7 +325,7 @@
 		>
 			<section slot="a">
 				<ComponentSelector show_modified={showModified} on:add on:remove />
-				<ModuleEditor {autocomplete} />
+				<ModuleEditor {autocomplete} error={compiled?.result.error} warnings={compiled?.result.warnings ?? []} />
 			</section>
 
 			<section slot="b" style="height: 100%;">
diff --git a/sites/svelte-5-preview/src/lib/workers/compiler/index.js b/sites/svelte-5-preview/src/lib/workers/compiler/index.js
index ff2c904136e7..0563cdaffdc6 100644
--- a/sites/svelte-5-preview/src/lib/workers/compiler/index.js
+++ b/sites/svelte-5-preview/src/lib/workers/compiler/index.js
@@ -69,9 +69,10 @@ function compile({ id, source, options, return_ast }) {
 				result: {
 					js: js.code,
 					css: css?.code || `/* Add a <sty` + `le> tag to see compiled CSS */`,
-					warnings
-				},
-				metadata
+					error: null,
+					warnings,
+					metadata
+				}
 			};
 		} else if (options.filename.endsWith('.svelte.js')) {
 			const compiled = svelte.compileModule(source, {
@@ -85,9 +86,10 @@ function compile({ id, source, options, return_ast }) {
 					result: {
 						js: compiled.js.code,
 						css,
-						warnings: compiled.warnings
-					},
-					metadata: compiled.metadata
+						error: null,
+						warnings: compiled.warnings,
+						metadata: compiled.metadata
+					}
 				};
 			}
 		}
@@ -96,7 +98,10 @@ function compile({ id, source, options, return_ast }) {
 			id,
 			result: {
 				js: `// Select a component, or a '.svelte.js' module that uses runes, to see compiled output`,
-				css
+				css,
+				error: null,
+				warnings: [],
+				metadata: null
 			}
 		};
 	} catch (err) {
@@ -107,7 +112,13 @@ function compile({ id, source, options, return_ast }) {
 			id,
 			result: {
 				js: message,
-				css: message
+				css: message,
+				error: {
+					message: err.message,
+					position: err.position
+				},
+				warnings: [],
+				metadata: null
 			}
 		};
 	}

From 0f788067d504a037faf07964fedc67d245cd03de Mon Sep 17 00:00:00 2001
From: Rich Harris <rich.harris@vercel.com>
Date: Fri, 10 Nov 2023 17:36:07 -0500
Subject: [PATCH 4/4] prettier

---
 .../src/lib/Input/ModuleEditor.svelte            | 16 +++++++++-------
 .../src/lib/Output/Output.svelte                 |  8 ++------
 sites/svelte-5-preview/src/lib/Repl.svelte       |  6 +++++-
 3 files changed, 16 insertions(+), 14 deletions(-)

diff --git a/sites/svelte-5-preview/src/lib/Input/ModuleEditor.svelte b/sites/svelte-5-preview/src/lib/Input/ModuleEditor.svelte
index 3bd6ebdb5f1e..e4951f041891 100644
--- a/sites/svelte-5-preview/src/lib/Input/ModuleEditor.svelte
+++ b/sites/svelte-5-preview/src/lib/Input/ModuleEditor.svelte
@@ -25,12 +25,14 @@
 			{autocomplete}
 			diagnostics={() => {
 				if (error) {
-					return [{
-						severity: 'error',
-						from: error.position[0],
-						to: error.position[1],
-						message: error.message
-					}];
+					return [
+						{
+							severity: 'error',
+							from: error.position[0],
+							to: error.position[1],
+							message: error.message
+						}
+					];
 				}
 
 				if (warnings) {
@@ -38,7 +40,7 @@
 						severity: 'warning',
 						from: warning.start.character,
 						to: warning.end.character,
-						message: warning.message,
+						message: warning.message
 					}));
 				}
 
diff --git a/sites/svelte-5-preview/src/lib/Output/Output.svelte b/sites/svelte-5-preview/src/lib/Output/Output.svelte
index 3b6f371787c8..d1018d6a6f69 100644
--- a/sites/svelte-5-preview/src/lib/Output/Output.svelte
+++ b/sites/svelte-5-preview/src/lib/Output/Output.svelte
@@ -38,13 +38,9 @@
 		if (selected.type === 'json') {
 			js_editor.set({ code: `/* Select a component to see its compiled code */`, lang: 'js' });
 			css_editor.set({ code: `/* Select a component to see its compiled code */`, lang: 'css' });
-		}
-
-		else if (selected.type=== 'md') {
+		} else if (selected.type === 'md') {
 			markdown = marked(selected.source);
-		}
-
-		else if (compiled) {
+		} else if (compiled) {
 			js_editor.set({ code: compiled.result.js, lang: 'js' });
 			css_editor.set({ code: compiled.result.css, lang: 'css' });
 		}
diff --git a/sites/svelte-5-preview/src/lib/Repl.svelte b/sites/svelte-5-preview/src/lib/Repl.svelte
index 51f621c91a50..1c02d9ca76cd 100644
--- a/sites/svelte-5-preview/src/lib/Repl.svelte
+++ b/sites/svelte-5-preview/src/lib/Repl.svelte
@@ -325,7 +325,11 @@
 		>
 			<section slot="a">
 				<ComponentSelector show_modified={showModified} on:add on:remove />
-				<ModuleEditor {autocomplete} error={compiled?.result.error} warnings={compiled?.result.warnings ?? []} />
+				<ModuleEditor
+					{autocomplete}
+					error={compiled?.result.error}
+					warnings={compiled?.result.warnings ?? []}
+				/>
 			</section>
 
 			<section slot="b" style="height: 100%;">