use fileURLToPath

packages/playground/start.js

@@ -1,13 +1,11 @@
 import { readFileSync, writeFileSync } from 'node:fs';
 import path from 'node:path';
+import { fileURLToPath } from 'node:url';
 import { watch } from 'rollup';
 import serve from 'rollup-plugin-serve';
 import * as svelte from '../svelte/src/compiler/index.js';
 
-let __dirname = new URL('.', import.meta.url).pathname;
-if (process.platform === 'win32') {
-	__dirname = __dirname.slice(1); // else path.resolve fucks up
-}
+const __dirname = fileURLToPath(new URL('.', import.meta.url));
 
 /** @returns {import('rollup').Plugin}*/
 function create_plugin(ssr = false) {

sites/svelte.dev/scripts/generate_examples.js

@@ -1,12 +1,10 @@
+import { fileURLToPath } from 'node:url';
 import { get_examples_data } from '../src/lib/server/examples/index.js';
 import fs from 'node:fs';
 
-let examples_path = new URL('../../../documentation/examples', import.meta.url).pathname;
-if (process.platform === 'win32') {
-	examples_path = examples_path.slice(1); // remove leading slash
-}
-
-const examples_data = get_examples_data(examples_path);
+const examples_data = get_examples_data(
+	fileURLToPath(new URL('../../../documentation/examples', import.meta.url))
+);
 
 try {
 	fs.mkdirSync(new URL('../src/lib/generated/', import.meta.url), { recursive: true });