fix: add fix

packages/wrangler/src/__tests__/dev.test.ts

@@ -1,5 +1,6 @@
 import * as fs from "node:fs";
 import module from "node:module";
+import path from "node:path";
 import getPort from "get-port";
 import { http, HttpResponse } from "msw";
 import patchConsole from "patch-console";
@@ -289,6 +290,34 @@ describe.sequential("wrangler dev", () => {
 			expect(config.entrypoint).toMatch(/index\.js$/);
 		});
 
+		it("should apply module root to parent if main is nested from base_dir", async () => {
+			writeWranglerToml({
+				main: "./some/base_dir/nested/index.js",
+				base_dir: "./some/base_dir",
+			});
+			fs.mkdirSync(path.dirname("./some/base_dir/nested/index.js"), {
+				recursive: true,
+			});
+			fs.mkdirSync(path.dirname("./some/base_dir/foo.js"), { recursive: true });
+
+			fs.writeFileSync(
+				"./some/base_dir/nested/index.js",
+				`import { x } from "../foo.js";
+					export default {
+					  fetch() {
+						return new Response(x);
+					  }
+				}`
+			);
+
+			fs.writeFileSync(
+				"./some/base_dir/foo.js",
+				`export const x = "Hello, world!"`
+			);
+			const config = await runWranglerUntilConfig("dev");
+			expect(config.entrypoint).toMatch(/some\/base_dir\/nested\/index\.js$/);
+		});
+
 		it("should use `main` from a named environment", async () => {
 			writeWranglerToml({
 				env: {

packages/wrangler/src/dev/miniflare.ts

@@ -288,7 +288,7 @@ async function buildSourceOptions(
 			? []
 			: await getEntrypointNames(entrypointSource);
 
-		const modulesRoot = path.dirname(scriptPath);
+		const modulesRoot = config.bundle.entry.moduleRoot;
 		const sourceOptions: SourceOptions = {
 			modulesRoot,