From 008f7647c4788207aab55ab12c734bd80e6df9c5 Mon Sep 17 00:00:00 2001
From: Simon Knott <info@simonknott.de>
Date: Mon, 25 Sep 2023 15:45:13 +0200
Subject: [PATCH] fix(netlify): bundle netlify functions as ESM to support
 top-level await (#8661)

---
 .changeset/witty-carrots-applaud.md                  |  5 +++++
 .../netlify/src/integration-functions.ts             | 12 +++++++++++-
 2 files changed, 16 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/witty-carrots-applaud.md

diff --git a/.changeset/witty-carrots-applaud.md b/.changeset/witty-carrots-applaud.md
new file mode 100644
index 000000000..16f516e40
--- /dev/null
+++ b/.changeset/witty-carrots-applaud.md
@@ -0,0 +1,5 @@
+---
+'@astrojs/netlify': patch
+---
+
+fix build failures because of CJS builds and top-level await
diff --git a/packages/integrations/netlify/src/integration-functions.ts b/packages/integrations/netlify/src/integration-functions.ts
index b8d56ad65..81aa8ff2f 100644
--- a/packages/integrations/netlify/src/integration-functions.ts
+++ b/packages/integrations/netlify/src/integration-functions.ts
@@ -1,5 +1,6 @@
 import type { AstroAdapter, AstroConfig, AstroIntegration, RouteData } from 'astro';
-import { extname } from 'node:path';
+import { extname, join } from 'node:path';
+import { writeFile } from 'node:fs/promises';
 import { fileURLToPath } from 'node:url';
 import { generateEdgeMiddleware } from './middleware.js';
 import type { Args } from './netlify-functions.js';
@@ -85,6 +86,15 @@ function netlifyFunctions({
 				}
 			},
 			'astro:build:done': async ({ routes, dir }) => {
+				const functionsConfig = {
+						version: 1,
+						config: {
+							nodeModuleFormat: "esm"
+						}
+				}
+				const functionsConfigPath = join(fileURLToPath(_config.build.server), "entry.json")
+				await writeFile(functionsConfigPath, JSON.stringify(functionsConfig))
+
 				const type = builders ? 'builders' : 'functions';
 				const kind = type ?? 'functions';