From 5684b437f71a357c602a4e43476f7274cd66f178 Mon Sep 17 00:00:00 2001
From: Evan Jacobs <ejacobs@aurorasolar.com>
Date: Thu, 19 Dec 2024 10:20:58 -0500
Subject: [PATCH] fix: handle ESM-style config file

---
 src/loadUserConfig.js       |  3 +++
 test/loadUserConfig-test.js | 19 +++++++++++++++++++
 2 files changed, 22 insertions(+)

diff --git a/src/loadUserConfig.js b/src/loadUserConfig.js
index 522e6ed..830787b 100644
--- a/src/loadUserConfig.js
+++ b/src/loadUserConfig.js
@@ -11,6 +11,9 @@ async function load(pathToConfigFile) {
     // await if the config is a function, async or not
     if (typeof userConfig === 'function') {
       userConfig = await userConfig();
+    } else if (userConfig?.default) {
+      // handle esm
+      userConfig = userConfig.default;
     }
     return { ...defaultConfig, ...userConfig };
   } catch (e) {
diff --git a/test/loadUserConfig-test.js b/test/loadUserConfig-test.js
index 73e15ca..c452587 100644
--- a/test/loadUserConfig-test.js
+++ b/test/loadUserConfig-test.js
@@ -186,3 +186,22 @@ it('warns when using an unknown config key', async () => {
     'Unknown config key used in .happo.js: "foobar"',
   );
 });
+
+it('handles an ESM-style config', async () => {
+  requireRelative.mockImplementation(() => ({
+    __esModule: true,
+    default: {
+      apiKey: '1',
+      apiSecret: '2',
+      targets: {
+        firefox: new RemoteBrowserTarget('firefox', { viewport: '800x600' }),
+      },
+    },
+  }));
+  const config = await loadUserConfig('bogus', {});
+  expect(config.apiKey).toEqual('1');
+  expect(config.apiSecret).toEqual('2');
+  expect(config.targets).toEqual({
+    firefox: new RemoteBrowserTarget('firefox', { viewport: '800x600' }),
+  });
+});