sveltejs · Rich-Harris · Jun 7, 2023 · May 27, 2023 · May 27, 2023 · May 27, 2023
diff --git a/.gitignore b/.gitignore
@@ -1,5 +1,6 @@
 .idea
 .DS_Store
-.vscode
+.vscode/*
+!.vscode/launch.json
 node_modules
 .eslintcache
diff --git a/.vscode/launch.json b/.vscode/launch.json
@@ -0,0 +1,27 @@
+{
+	"version": "0.2.0",
+	"configurations": [
+		{
+			"type": "chrome",
+			"request": "launch",
+			"name": "Playground: Browser",
+			"url": "http://localhost:10001"
+		},
+		{
+			"type": "node",
+			"request": "launch",
+			"runtimeArgs": ["--watch"],
+			"name": "Playground: Server",
+			"outputCapture": "std",
+			"program": "start.js",
+			"cwd": "${workspaceFolder}/packages/playground",
+			"cascadeTerminateToConfigurations": ["Playground: Browser"]
+		}
+	],
+	"compounds": [
+		{
+			"name": "Playground: Full",
+			"configurations": ["Playground: Server", "Playground: Browser"]
+		}
+	]
+}
diff --git a/packages/playground/.gitignore b/packages/playground/.gitignore
@@ -0,0 +1,3 @@
+dist
+dist-ssr
+*.local
diff --git a/packages/playground/README.md b/packages/playground/README.md
@@ -0,0 +1,7 @@
+You may use this package to experiment with your changes to Svelte.
+
+To prevent any changes you make in this directory from being accidentally committed, run `git update-index --skip-worktree ./**/*.*` in this directory.
+
+If you would actually like to make some changes to the files here for everyone then run `git update-index --no-skip-worktree ./**/*.*` before committing.
+
+If you're using VS Code, you can use the "Playground: Full" launch configuration to run the playground and attach the debugger to both the compiler and the browser.
diff --git a/packages/playground/jsconfig.json b/packages/playground/jsconfig.json
@@ -0,0 +1,33 @@
+{
+	"compilerOptions": {
+		"moduleResolution": "Node",
+		"target": "ESNext",
+		"module": "ESNext",
+		/**
+		 * svelte-preprocess cannot figure out whether you have
+		 * a value or a type, so tell TypeScript to enforce using
+		 * `import type` instead of `import` for Types.
+		 */
+		"verbatimModuleSyntax": true,
+		"isolatedModules": true,
+		"resolveJsonModule": true,
+		/**
+		 * To have warnings / errors of the Svelte compiler at the
+		 * correct position, enable source maps by default.
+		 */
+		"sourceMap": true,
+		"esModuleInterop": true,
+		"skipLibCheck": true,
+		"forceConsistentCasingInFileNames": true,
+		/**
+		 * Typecheck JS in `.svelte` and `.js` files by default.
+		 * Disable this if you'd like to use dynamic types.
+		 */
+		"checkJs": true
+	},
+	/**
+	 * Use global.d.ts instead of compilerOptions.types
+	 * to avoid limiting type declarations.
+	 */
+	"include": ["src/**/*.d.ts", "src/**/*.js", "src/**/*.svelte"]
+}
diff --git a/packages/playground/package.json b/packages/playground/package.json
@@ -0,0 +1,14 @@
+{
+	"name": "playground",
+	"private": true,
+	"version": "0.0.0",
+	"type": "module",
+	"scripts": {
+		"dev": "node --watch start.js"
+	},
+	"devDependencies": {
+		"rollup": "^3.20.2",
+		"rollup-plugin-serve": "^2.0.2",
+		"svelte": "workspace:*"
+	}
+}
diff --git a/packages/playground/src/App.svelte b/packages/playground/src/App.svelte
@@ -0,0 +1,3 @@
+<div>
+    Hello world!
+</div>
diff --git a/packages/playground/src/entry-client.js b/packages/playground/src/entry-client.js
@@ -0,0 +1,24 @@
+import App from './App.svelte';
+
+new App({
+	target: document.getElementById('app'),
+	hydrate: true
+});
+
+function get_version() {
+	return fetch('/version.json').then((r) => r.json());
+}
+
+let prev = await get_version();
+
+// Mom: We have live reloading at home
+// Live reloading at home:
+while (true) {
+	await new Promise((r) => setTimeout(r, 2500));
+	try {
+		const version = await get_version();
+		if (prev !== version) {
+			window.location.reload();
+		}
+	} catch {}
+}
diff --git a/packages/playground/src/entry-server.js b/packages/playground/src/entry-server.js
@@ -0,0 +1,6 @@
+import App from './App.svelte';
+
+export function render() {
+	// @ts-ignore
+	return App.render();
+}
diff --git a/packages/playground/src/lib/Counter.svelte b/packages/playground/src/lib/Counter.svelte
@@ -0,0 +1,10 @@
+<script>
+  let count = 0
+  const increment = () => {
+    count += 1
+  }
+</script>
+
+<button on:click={increment}>
+  count is {count}
+</button>
diff --git a/packages/playground/src/template.html b/packages/playground/src/template.html
@@ -0,0 +1,13 @@
+<!DOCTYPE html>
+<html lang="en">
+	<head>
+		<meta charset="UTF-8" />
+		<meta name="viewport" content="width=device-width, initial-scale=1.0" />
+		<title><!--app-title--></title>
+		<!--app-head-->
+	</head>
+	<body>
+		<div id="app"><!--app-html--></div>
+		<script type="module" src="/entry-client.js"></script>
+	</body>
+</html>
diff --git a/packages/playground/start.js b/packages/playground/start.js
@@ -0,0 +1,100 @@
+import { readFileSync, writeFileSync } from 'node:fs';
+import path from 'node:path';
+import { watch } from 'rollup';
+import serve from 'rollup-plugin-serve';
+import * as svelte from '../svelte/src/compiler/index.js';
+
+const __dirname = new URL('.', import.meta.url).pathname;
+
+/** @returns {import('rollup').Plugin}*/
+function create_plugin(ssr = false) {
+	return {
+		name: 'custom-svelte-ssr-' + ssr,
+		resolveId(id) {
+			if (id === 'svelte') {
+				return path.resolve(
+					__dirname,
+					ssr ? '../svelte/src/runtime/ssr.js' : '../svelte/src/runtime/index.js'
+				);
+			} else if (id.startsWith('svelte/')) {
+				return path.resolve(__dirname, `../svelte/src/runtime/${id.slice(7)}/index.js`);
+			}
+		},
+		transform(code, id) {
+			code = code.replaceAll('import.meta.env.SSR', ssr);
+
+			if (!id.endsWith('.svelte')) {
+				return {
+					code,
+					map: null
+				};
+			}
+
+			const compiled = svelte.compile(code, {
+				filename: id,
+				generate: ssr ? 'ssr' : 'dom',
+				hydratable: true,
+				css: 'injected'
+			});
+
+			return compiled.js;
+		}
+	};
+}
+
+const client_plugin = create_plugin();
+const ssr_plugin = create_plugin(true);
+
+const watcher = watch([
+	{
+		input: 'src/entry-client.js',
+		output: {
+			dir: 'dist',
+			format: 'esm',
+			sourcemap: true
+		},
+		plugins: [client_plugin, serve('dist')]
+	},
+	{
+		input: 'src/entry-server.js',
+		output: {
+			dir: 'dist-ssr',
+			format: 'iife',
+			indent: false
+		},
+		plugins: [
+			ssr_plugin,
+			{
+				async generateBundle(_, bundle) {
+					const result = bundle['entry-server.js'];
+					const mod = (0, eval)(result.code);
+					const { html } = mod.render();
+
+					writeFileSync(
+						'dist/index.html',
+						readFileSync('src/template.html', 'utf-8')
+							.replace('<!--app-html-->', html)
+							.replace('<!--app-title-->', svelte.VERSION)
+					);
+					writeFileSync('dist/version.json', Date.now().toString());
+				}
+			}
+		],
+		onwarn(warning, handler) {
+			if (warning.code === 'MISSING_NAME_OPTION_FOR_IIFE_EXPORT') return;
+			handler(warning);
+		}
+	}
+]);
+
+watcher
+	.on('change', (id) => {
+		console.log(`changed ${id}`);
+	})
+	.on('event', (event) => {
+		if (event.code === 'ERROR') {
+			console.error(event.error);
+		} else if (event.code === 'BUNDLE_END') {
+			console.log(`Generated ${event.output} in ${event.duration}ms`);
+		}
+	});
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml