feat: allow version to be a pr-[prnumber] or commit-[commithash]

apps/svelte.dev/src/config.js

@@ -1,6 +1,5 @@
 // REPL props
 
-export const svelteUrl = `https://unpkg.com/svelte@4`;
 export const mapbox_setup = `window.MAPBOX_ACCESS_TOKEN = '${
 	import.meta.env.VITE_MAPBOX_ACCESS_TOKEN
 }';`;

apps/svelte.dev/src/lib/tutorial/adapters/rollup/index.svelte.ts

@@ -24,8 +24,7 @@ export async function create(): Promise<Adapter> {
 
 	bundler = new Bundler({
 		packages_url: 'https://unpkg.com',
-		svelte_url: `https://unpkg.com/svelte`,
-		// svelte_url: `${browser ? location.origin : ''}/svelte`, // TODO think about bringing back main-build for Playground?
+		svelte_version: 'latest',
 		onstatus(val) {
 			if (!done && val === null) {
 				done = true;

apps/svelte.dev/src/routes/(authed)/playground/[id]/+page.server.ts

@@ -1,7 +1,7 @@
 import { error } from '@sveltejs/kit';
 import type { Examples } from '../api/examples/all.json/+server.js';
 
-export async function load({ fetch, params, url }) {
+export async function load({ fetch, params }) {
 	const examples_res = fetch('/playground/api/examples/all.json').then((r) => r.json());
 	const res = await fetch(`/playground/api/${params.id}.json`);
 
@@ -21,7 +21,6 @@ export async function load({ fetch, params, url }) {
 					title: example.title,
 					slug: example.slug
 				}))
-			})),
-		version: url.searchParams.get('version') || 'latest'
+			}))
 	};
 }

apps/svelte.dev/src/routes/(authed)/playground/[id]/+page.svelte

@@ -4,7 +4,6 @@
 	import type { Gist } from '$lib/db/types';
 	import { Repl } from '@sveltejs/repl';
 	import { theme } from '@sveltejs/site-kit/stores';
-	import { onMount } from 'svelte';
 	import { mapbox_setup } from '../../../../config.js';
 	import AppControls from './AppControls.svelte';
 	import { compress_and_encode_text, decode_and_decompress_text } from './gzip.js';
@@ -18,15 +17,18 @@
 	let repl = $state() as ReturnType<typeof Repl>;
 	let name = $state(data.gist.name);
 	let modified = $state(false);
-	let version = data.version;
 	let setting_hash: any = null;
 
+	// svelte-ignore non_reactive_update
+	let version = $page.url.searchParams.get('version') || 'latest';
+	let is_pr_or_commit_version = version.startsWith('pr-') || version.startsWith('commit-');
+
 	// Hashed URLs are less safe (we can't delete malicious REPLs), therefore
 	// don't allow links to escape the sandbox restrictions
 	const can_escape = browser && !$page.url.hash;
 
-	onMount(() => {
-		if (version !== 'local') {
+	if (version !== 'local' && !is_pr_or_commit_version) {
+		$effect(() => {
 			fetch(`https://unpkg.com/svelte@${version}/package.json`)
 				.then((r) => r.json())
 				.then((pkg) => {
@@ -40,8 +42,8 @@
 						replaceState(url, {});
 					}
 				});
-		}
-	});
+		});
+	}
 
 	afterNavigate(() => {
 		name = data.gist.name;
@@ -148,11 +150,6 @@
 		}
 	}
 
-	const svelteUrl =
-		browser && version === 'local'
-			? `${location.origin}/playground/local`
-			: `https://unpkg.com/svelte@${version}`;
-
 	const relaxed = $derived(data.gist.relaxed || (data.user && data.user.id === data.gist.owner));
 </script>
 
@@ -198,7 +195,7 @@
 		<div style="display: contents" onfocusout={update_hash}>
 			<Repl
 				bind:this={repl}
-				{svelteUrl}
+				svelteVersion={version}
 				{relaxed}
 				{can_escape}
 				injectedJS={mapbox_setup}

apps/svelte.dev/src/routes/(authed)/playground/[id]/embed/+page.svelte

@@ -4,35 +4,34 @@
 	import { theme } from '@sveltejs/site-kit/stores';
 	import { Repl } from '@sveltejs/repl';
 	import { mapbox_setup } from '../../../../../config.js';
-	import { onMount } from 'svelte';
+	import { page } from '$app/stores';
 
 	let { data } = $props();
 
 	let repl = $state() as ReturnType<typeof Repl>;
 
-	onMount(() => {
-		if (data.version !== 'local') {
-			fetch(`https://unpkg.com/svelte@${data.version}/package.json`)
+	// svelte-ignore non_reactive_update
+	let version = $page.url.searchParams.get('version') || 'latest';
+	let is_pr_or_commit_version = version.startsWith('pr-') || version.startsWith('commit-');
+
+	if (version !== 'local' && !is_pr_or_commit_version) {
+		$effect(() => {
+			fetch(`https://unpkg.com/svelte@${version}/package.json`)
 				.then((r) => r.json())
 				.then((pkg) => {
 					if (pkg.version !== data.version) {
 						replaceState(`/playground/${data.gist.id}/embed?version=${pkg.version}`, {});
 					}
 				});
-		}
-	});
+		});
+	}
 
 	afterNavigate(() => {
 		repl?.set({
 			files: data.gist.components
 		});
 	});
 
-	const svelteUrl =
-		browser && data.version === 'local'
-			? `${location.origin}/playground/local`
-			: `https://unpkg.com/svelte@${data.version}`;
-
 	const relaxed = $derived(data.gist.relaxed || (data.user && data.user.id === data.gist.owner));
 </script>
 
@@ -48,7 +47,7 @@
 	{#if browser}
 		<Repl
 			bind:this={repl}
-			{svelteUrl}
+			svelteVersion={version}
 			{relaxed}
 			can_escape
 			injectedJS={mapbox_setup}

packages/editor/package.json

@@ -63,6 +63,7 @@
 	"type": "module",
 	"dependencies": {
 		"@lezer/highlight": "^1.2.1",
-		"esm-env": "^1.0.0"
+		"esm-env": "^1.0.0",
+		"tarparser": "^0.0.4"
 	}
 }

packages/editor/src/lib/compile-worker/worker.ts

@@ -1,49 +1,68 @@
+import { parseTar } from 'tarparser';
 import type { CompileResult } from 'svelte/compiler';
 import type { ExposedCompilerOptions, File } from '../Workspace.svelte';
+import type { FileDescription } from 'tarparser';
 
 // hack for magic-string and Svelte 4 compiler
 // do not put this into a separate module and import it, would be treeshaken in prod
 self.window = self;
 
 declare var self: Window & typeof globalThis & { svelte: typeof import('svelte/compiler') };
 
-let inited = false;
-let fulfil_ready: (arg?: never) => void;
-const ready = new Promise((f) => {
-	fulfil_ready = f;
-});
+let inited: PromiseWithResolvers<typeof self.svelte>;
 
-addEventListener('message', async (event) => {
-	if (!inited) {
-		inited = true;
-		const svelte_url = `https://unpkg.com/svelte@${event.data.version}`;
-		const { version } = await fetch(`${svelte_url}/package.json`).then((r) => r.json());
-
-		if (version.startsWith('4.')) {
-			// unpkg doesn't set the correct MIME type for .cjs files
-			// https://github.com/mjackson/unpkg/issues/355
-			const compiler = await fetch(`${svelte_url}/compiler.cjs`).then((r) => r.text());
-			(0, eval)(compiler + '\n//# sourceURL=compiler.cjs@' + version);
-		} else if (version.startsWith('3.')) {
-			const compiler = await fetch(`${svelte_url}/compiler.js`).then((r) => r.text());
-			(0, eval)(compiler + '\n//# sourceURL=compiler.js@' + version);
-		} else {
-			const compiler = await fetch(`${svelte_url}/compiler/index.js`).then((r) => r.text());
-			(0, eval)(compiler + '\n//# sourceURL=compiler/index.js@' + version);
+async function init(v: string) {
+	const svelte_url = `https://unpkg.com/svelte@${v}`;
+	const match = /^(?:pr|commit)-(.+)/.exec(v);
+
+	let tarball: FileDescription[] | undefined;
+	let version: string;
+
+	if (match) {
+		const response = await fetch(`https://pkg.pr.new/svelte@${match[1]}`);
+
+		if (!response.ok) {
+			throw new Error('Could not fetch tarball');
 		}
 
-		fulfil_ready();
+		tarball = await parseTar(await response.arrayBuffer());
+
+		const json = tarball.find((file) => file.name === 'package/package.json')!.text;
+		version = JSON.parse(json).version;
+	} else {
+		version = (await fetch(`${svelte_url}/package.json`).then((r) => r.json())).version;
+	}
+
+	const entry = version.startsWith('3.')
+		? 'compiler.js'
+		: version.startsWith('4.')
+			? 'compiler.cjs'
+			: 'compiler/index.js';
+
+	const compiler = tarball
+		? tarball.find((file) => file.name === `package/${entry}`)!.text
+		: await fetch(`${svelte_url}/${entry}`).then((r) => r.text());
+
+	(0, eval)(compiler + `\n//# sourceURL=${entry}@` + version);
+
+	return self.svelte;
+}
+
+addEventListener('message', async (event) => {
+	if (!inited) {
+		inited = Promise.withResolvers();
+		init(event.data.version).then(inited.resolve, inited.reject);
 	}
 
-	await ready;
+	const svelte = await inited.promise;
 
 	const { id, file, options } = event.data as {
 		id: number;
 		file: File;
 		options: ExposedCompilerOptions;
 	};
 
-	if (!file.name.endsWith('.svelte') && !self.svelte.compileModule) {
+	if (!file.name.endsWith('.svelte') && !svelte.compileModule) {
 		// .svelte.js file compiled with Svelte 3/4 compiler
 		postMessage({
 			id,
@@ -59,9 +78,9 @@ addEventListener('message', async (event) => {
 
 	let migration = null;
 
-	if (self.svelte.migrate) {
+	if (svelte.migrate) {
 		try {
-			migration = self.svelte.migrate(file.contents, { filename: file.name });
+			migration = svelte.migrate(file.contents, { filename: file.name });
 		} catch (e) {
 			// can this happen?
 		}
@@ -71,7 +90,7 @@ addEventListener('message', async (event) => {
 		let result: CompileResult;
 
 		if (file.name.endsWith('.svelte')) {
-			const is_svelte_3_or_4 = !self.svelte.compileModule;
+			const is_svelte_3_or_4 = !svelte.compileModule;
 			const compilerOptions: any = {
 				generate: is_svelte_3_or_4
 					? options.generate === 'client'
@@ -84,9 +103,9 @@ addEventListener('message', async (event) => {
 			if (!is_svelte_3_or_4) {
 				compilerOptions.modernAst = options.modernAst; // else Svelte 3/4 will throw an "unknown option" error
 			}
-			result = self.svelte.compile(file.contents, compilerOptions);
+			result = svelte.compile(file.contents, compilerOptions);
 		} else {
-			result = self.svelte.compileModule(file.contents, {
+			result = svelte.compileModule(file.contents, {
 				generate: options.generate,
 				dev: options.dev,
 				filename: file.name

packages/repl/package.json

@@ -86,6 +86,7 @@
 		"marked": "^14.1.2",
 		"resolve.exports": "^2.0.2",
 		"svelte": "5.0.1",
+		"tarparser": "^0.0.4",
 		"zimmerframe": "^1.1.2"
 	}
 }

packages/repl/src/lib/Bundler.ts

@@ -15,18 +15,20 @@ export default class Bundler {
 
 	constructor({
 		packages_url,
-		svelte_url,
-		onstatus
+		svelte_version,
+		onstatus,
+		onerror
 	}: {
 		packages_url: string;
-		svelte_url: string;
+		svelte_version: string;
 		onstatus: (val: string | null) => void;
+		onerror?: (message: string) => void;
 	}) {
-		this.hash = `${packages_url}:${svelte_url}`;
+		this.hash = `${packages_url}:${svelte_version}`;
 
 		if (!workers.has(this.hash)) {
 			const worker = new Worker();
-			worker.postMessage({ type: 'init', packages_url, svelte_url });
+			worker.postMessage({ type: 'init', packages_url, svelte_version });
 			workers.set(this.hash, worker);
 		}
 
@@ -44,6 +46,11 @@ export default class Bundler {
 					return;
 				}
 
+				if (event.data.type === 'error') {
+					onerror?.(event.data.message);
+					return;
+				}
+
 				onstatus(null);
 				handler(event.data);
 				this.handlers.delete(event.data.uid);
@@ -54,7 +61,6 @@ export default class Bundler {
 	bundle(files: File[], options: CompileOptions = {}): Promise<BundleResult> {
 		return new Promise<any>((fulfil) => {
 			this.handlers.set(uid, fulfil);
-
 			this.worker.postMessage({
 				uid,
 				type: 'bundle',