fix: ensure shared file is resolved properly in all situations (sveltejs#566)

using a relative import means it may be relatively imported from within a node module, which leads to wrong results

fixes sveltejs#555

Author: dummdidumm

packages/repl/src/lib/workers/bundler/index.ts

@@ -256,6 +256,8 @@ async function get_bundle(
 				}
 			}
 
+			if (importee === shared_file) return importee;
+
 			// importing from another file in REPL
 			if (local_files_lookup.has(importee) && (!importer || local_files_lookup.has(importer)))
 				return importee;
@@ -394,7 +396,7 @@ async function get_bundle(
 					result.js.code +=
 						'\n\n' +
 						`
-					import { styles as $$_styles } from './__shared.js';
+					import { styles as $$_styles } from '${shared_file}';
 					const $$__style = document.createElement('style');
 					$$__style.textContent = ${JSON.stringify(result.css.code)};
 					document.head.append($$__style);
@@ -476,6 +478,8 @@ async function get_bundle(
 
 export type BundleResult = ReturnType<typeof bundle>;
 
+const shared_file = '$$__shared__.js';
+
 async function bundle({
 	uid,
 	files,
@@ -500,7 +504,7 @@ async function bundle({
 			version.split('.')[0] >= '5'
 				? `
 			import { unmount as u } from 'svelte';
-			import { styles } from './__shared.js';
+			import { styles } from '${shared_file}';
 			export { mount, untrack } from 'svelte';
 			export {default as App} from './App.svelte';
 			export function unmount(component) {
@@ -509,7 +513,7 @@ async function bundle({
 			}
 		`
 				: `
-			import { styles } from './__shared.js';
+			import { styles } from '${shared_file}';
 			export {default as App} from './App.svelte';
 			export function mount(component, options) {
 				return new component(options);
@@ -525,10 +529,10 @@ async function bundle({
 		text: true
 	});
 
-	lookup.set('./__shared.js', {
+	lookup.set(shared_file, {
 		type: 'file',
-		name: '__shared.js',
-		basename: '__shared.js',
+		name: shared_file,
+		basename: shared_file,
 		contents: `
 			export let styles = [];
 		`,