fix: convert compile error on hmr (#592)

* fix: patch compiler error so that vite shows nice error overlay

* chore: remove useless try/catch

Author: dominikg

.changeset/small-oranges-give.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/vite-plugin-svelte': patch
+---
+
+show correct error overlay for compiler errors during hot update

packages/vite-plugin-svelte/src/handle-hot-update.ts

@@ -4,6 +4,7 @@ import { log, logCompilerWarnings } from './utils/log';
 import { SvelteRequest } from './utils/id';
 import { VitePluginSvelteCache } from './utils/vite-plugin-svelte-cache';
 import { ResolvedOptions } from './utils/options';
+import { toRollupError } from './utils/error';
 
 /**
  * Vite-specific HMR handling
@@ -32,7 +33,7 @@ export async function handleHotUpdate(
 		cache.update(compileData);
 	} catch (e) {
 		cache.setError(svelteRequest, e);
-		throw e;
+		throw toRollupError(e, options);
 	}
 
 	const affectedModules = [...modules];

packages/vite-plugin-svelte/src/index.ts

@@ -219,11 +219,7 @@ export function svelte(inlineOptions?: Partial<Options>): Plugin[] {
 				}
 				const svelteRequest = requestParser(ctx.file, false, ctx.timestamp);
 				if (svelteRequest) {
-					try {
-						return handleHotUpdate(compileSvelte, ctx, svelteRequest, cache, options);
-					} catch (e) {
-						throw toRollupError(e, options);
-					}
+					return handleHotUpdate(compileSvelte, ctx, svelteRequest, cache, options);
 				}
 			},
 			async buildEnd() {