From a42344198d14b5bfcc0dd163a88404da7b435337 Mon Sep 17 00:00:00 2001
From: Peter Bacon Darwin <pbacondarwin@cloudflare.com>
Date: Sun, 6 Oct 2024 15:51:13 +0100
Subject: [PATCH] fix: ensure that `alias` config gets passed through to the
 bundler when using new `--x-dev-env`

Fixes #6898
---
 .changeset/grumpy-apples-juggle.md                        | 7 +++++++
 .../__tests__/api/startDevWorker/ConfigController.test.ts | 8 +++++++-
 .../wrangler/src/api/startDevWorker/ConfigController.ts   | 1 +
 3 files changed, 15 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/grumpy-apples-juggle.md

diff --git a/.changeset/grumpy-apples-juggle.md b/.changeset/grumpy-apples-juggle.md
new file mode 100644
index 000000000000..7d374b96ddd8
--- /dev/null
+++ b/.changeset/grumpy-apples-juggle.md
@@ -0,0 +1,7 @@
+---
+"wrangler": patch
+---
+
+fix: ensure that `alias` config gets passed through to the bundler when using new `--x-dev-env`
+
+Fixes #6898
diff --git a/packages/wrangler/src/__tests__/api/startDevWorker/ConfigController.test.ts b/packages/wrangler/src/__tests__/api/startDevWorker/ConfigController.test.ts
index 77617274e7a3..ae4abd05adc7 100644
--- a/packages/wrangler/src/__tests__/api/startDevWorker/ConfigController.test.ts
+++ b/packages/wrangler/src/__tests__/api/startDevWorker/ConfigController.test.ts
@@ -123,14 +123,20 @@ describe("ConfigController", () => {
 			dev: {
 				origin: { hostname: "myexample.com" },
 			},
+			build: {
+				alias: { foo: "bar" },
+			},
 		});
-		// expect `dev` field to be overwritten and all other config to remain intact
+		// expect `dev` and `build.alias` fields to be overwritten and all other config to remain intact
 		await expect(event3).resolves.toMatchObject({
 			type: "configUpdate",
 			config: {
 				entrypoint: path.join(process.cwd(), "src/index.ts"),
 				directory: process.cwd(),
 				build: {
+					alias: {
+						foo: "bar",
+					},
 					additionalModules: [],
 					define: {},
 					format: "modules",
diff --git a/packages/wrangler/src/api/startDevWorker/ConfigController.ts b/packages/wrangler/src/api/startDevWorker/ConfigController.ts
index 49ea954ee5b9..3278c3cfe4d8 100644
--- a/packages/wrangler/src/api/startDevWorker/ConfigController.ts
+++ b/packages/wrangler/src/api/startDevWorker/ConfigController.ts
@@ -257,6 +257,7 @@ async function resolveConfig(
 		triggers: await resolveTriggers(config, input),
 		env: input.env,
 		build: {
+			alias: input.build?.alias ?? config.alias,
 			additionalModules: input.build?.additionalModules ?? [],
 			processEntrypoint: Boolean(input.build?.processEntrypoint),
 			bundle: input.build?.bundle ?? !config.no_bundle,