fix(resolve): normalize path returned from svelte field resolve (#635)

Author: dominikg

.changeset/fluffy-dancers-impress.md

@@ -0,0 +1,5 @@
+---
+'@sveltejs/vite-plugin-svelte': patch
+---
+
+fix(resolve): normalize path resolved from "svelte" field to ensure consistency across operating systems

packages/vite-plugin-svelte/src/utils/resolve.ts

@@ -2,6 +2,7 @@ import path from 'path';
 import { builtinModules } from 'module';
 import { resolveDependencyData, isCommonDepWithoutSvelteField } from './dependencies';
 import { VitePluginSvelteCache } from './vite-plugin-svelte-cache';
+import { normalizePath } from 'vite';
 
 export async function resolveViaPackageJsonSvelte(
 	importee: string,
@@ -22,7 +23,7 @@ export async function resolveViaPackageJsonSvelte(
 		if (pkgData) {
 			const { pkg, dir } = pkgData;
 			if (pkg.svelte) {
-				const result = path.resolve(dir, pkg.svelte);
+				const result = normalizePath(path.resolve(dir, pkg.svelte));
 				cache.setResolvedSvelteField(importee, importer, result);
 				return result;
 			}