chore: fix entrypoint logic and refactor (#6971)

* chore: fix entrypoint logic and refactor

* chore: remove spurious files

* Add test case

packages/wrangler/src/__tests__/api/startDevWorker/ConfigController.test.ts

@@ -56,6 +56,41 @@ describe("ConfigController", () => {
 		});
 	});
 
+	it("should apply module root to parent if main is nested from base_dir", async () => {
+		const controller = new ConfigController();
+		const event = waitForConfigUpdate(controller);
+		await seed({
+			"some/base_dir/nested/index.js": dedent/* javascript */ `
+				export default {
+					fetch(request, env, ctx) {
+						return new Response("hello world")
+					}
+				}
+			`,
+			"wrangler.toml": dedent`
+				main = \"./some/base_dir/nested/index.js\"
+base_dir = \"./some/base_dir\"`,
+		});
+
+		const config: StartDevWorkerInput = {};
+
+		await controller.set(config);
+
+		await expect(event).resolves.toMatchObject({
+			type: "configUpdate",
+			config: {
+				build: {
+					additionalModules: [],
+					define: {},
+					format: "modules",
+					moduleRoot: path.join(process.cwd(), "./some/base_dir"),
+					moduleRules: [],
+				},
+				directory: process.cwd(),
+				entrypoint: path.join(process.cwd(), "./some/base_dir/nested/index.js"),
+			},
+		});
+	});
 	it("should shallow merge patched config", async () => {
 		const controller = new ConfigController();
 		const event1 = waitForConfigUpdate(controller);

packages/wrangler/src/deployment-bundle/entry.ts

@@ -1,8 +1,13 @@
 import path from "node:path";
 import { UserError } from "../errors";
 import { logger } from "../logger";
-import { getBasePath } from "../paths";
 import guessWorkerFormat from "./guess-worker-format";
+import {
+	resolveEntryWithAssets,
+	resolveEntryWithEntryPoint,
+	resolveEntryWithMain,
+	resolveEntryWithScript,
+} from "./resolve-entry";
 import { runCustomBuild } from "./run-custom-build";
 import type { Config } from "../config";
 import type { DurableObjectBindings } from "../config/environment";
@@ -42,41 +47,33 @@ export async function getEntry(
 	config: Config,
 	command: "dev" | "deploy" | "versions upload" | "types"
 ): Promise<Entry> {
-	let file: string;
-	let directory = process.cwd();
+	const directory = process.cwd();
+	const entryPoint = config.site?.["entry-point"];
+
+	let paths: { absolutePath: string; relativePath: string } | undefined;
 
 	if (args.script) {
-		// If the script name comes from the command line it is relative to the current working directory.
-		file = path.resolve(args.script);
-	} else if (config.main === undefined) {
-		if (config.site?.["entry-point"]) {
-			directory = path.resolve(path.dirname(config.configPath ?? "."));
-			file = path.extname(config.site?.["entry-point"])
-				? path.resolve(config.site?.["entry-point"])
-				: // site.entry-point could be a directory
-					path.resolve(config.site?.["entry-point"], "index.js");
-		} else if (
-			args.legacyAssets ||
-			config.legacy_assets ||
-			args.assets ||
-			config.assets
-		) {
-			file = path.resolve(getBasePath(), "templates/no-op-worker.js");
-		} else {
-			throw new UserError(
-				`Missing entry-point: The entry-point should be specified via the command line (e.g. \`wrangler ${command} path/to/script\`) or the \`main\` config field.`
-			);
-		}
+		paths = resolveEntryWithScript(args.script);
+	} else if (config.main !== undefined) {
+		paths = resolveEntryWithMain(config.main, config.configPath);
+	} else if (entryPoint) {
+		paths = resolveEntryWithEntryPoint(entryPoint, config.configPath);
+	} else if (
+		args.legacyAssets ||
+		config.legacy_assets ||
+		args.assets ||
+		config.assets
+	) {
+		paths = resolveEntryWithAssets();
 	} else {
-		directory = path.resolve(path.dirname(config.configPath ?? "."));
-		file = path.resolve(directory, config.main);
+		throw new UserError(
+			`Missing entry-point: The entry-point should be specified via the command line (e.g. \`wrangler ${command} path/to/script\`) or the \`main\` config field.`
+		);
 	}
-
-	const relativeFile = path.relative(directory, file) || ".";
-	await runCustomBuild(file, relativeFile, config.build);
+	await runCustomBuild(paths.absolutePath, paths.relativePath, config.build);
 
 	const format = await guessWorkerFormat(
-		file,
+		paths.absolutePath,
 		directory,
 		args.format ?? config.build?.upload?.format,
 		config.tsconfig
@@ -110,10 +107,11 @@ export async function getEntry(
 	}
 
 	return {
-		file,
+		file: paths.absolutePath,
 		directory,
 		format,
-		moduleRoot: args.moduleRoot ?? config.base_dir ?? path.dirname(file),
+		moduleRoot:
+			args.moduleRoot ?? config.base_dir ?? path.dirname(paths.absolutePath),
 		name: config.name ?? "worker",
 	};
 }

packages/wrangler/src/deployment-bundle/resolve-entry.ts

@@ -0,0 +1,48 @@
+import path from "path";
+import { getBasePath } from "../paths";
+
+export function resolveEntryWithScript(script: string): {
+	absolutePath: string;
+	relativePath: string;
+} {
+	const file = path.resolve(script);
+	const relativePath = path.relative(process.cwd(), file) || ".";
+	return { absolutePath: file, relativePath };
+}
+
+export function resolveEntryWithMain(
+	main: string,
+	configPath?: string
+): {
+	absolutePath: string;
+	relativePath: string;
+} {
+	const directory = path.resolve(path.dirname(configPath ?? "."));
+	const file = path.resolve(directory, main);
+	const relativePath = path.relative(directory, file) || ".";
+	return { absolutePath: file, relativePath };
+}
+
+export function resolveEntryWithEntryPoint(
+	entryPoint: string,
+	configPath?: string
+): {
+	absolutePath: string;
+	relativePath: string;
+} {
+	const directory = path.resolve(path.dirname(configPath ?? "."));
+	const file = path.extname(entryPoint)
+		? path.resolve(entryPoint)
+		: path.resolve(entryPoint, "index.js");
+	const relativePath = path.relative(directory, file) || ".";
+	return { absolutePath: file, relativePath };
+}
+
+export function resolveEntryWithAssets(): {
+	absolutePath: string;
+	relativePath: string;
+} {
+	const file = path.resolve(getBasePath(), "templates/no-op-worker.js");
+	const relativePath = path.relative(process.cwd(), file) || ".";
+	return { absolutePath: file, relativePath };
+}