From 7bb6273eb59cc1461571df0a9c5105b14e53afaf Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Nacho=20Codo=C3=B1er?= <igcogi@gmail.com>
Date: Mon, 19 May 2025 17:54:17 +0200
Subject: [PATCH] test coverage for swc.config.js

---
 tools/tests/modern.js | 56 ++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 53 insertions(+), 3 deletions(-)

diff --git a/tools/tests/modern.js b/tools/tests/modern.js
index cf40089a42..643ac2e5ea 100644
--- a/tools/tests/modern.js
+++ b/tools/tests/modern.js
@@ -59,7 +59,7 @@ selftest.define("modern build stack", async function () {
   await s.cd("modern");
 
   s.set("METEOR_PROFILE", "0");
-  
+
   await writeModernConfig(s, true);
 
   const run = s.run();
@@ -297,6 +297,12 @@ async function writeSwcrcConfig(s, config) {
   s.write(".swcrc", JSON.stringify(json, null, 2) + "\n");
 }
 
+async function writeSwcConfigJs(s, config) {
+  // Create a JavaScript file that exports the configuration
+  const jsContent = `module.exports = ${JSON.stringify(config, null, 2)};`;
+  s.write("swc.config.js", jsContent);
+}
+
 selftest.define("modern build stack - transpiler custom .swcrc", async function () {
   const currentMeteorModern = process.env.METEOR_MODERN;
   process.env.METEOR_MODERN = '';
@@ -328,6 +334,50 @@ selftest.define("modern build stack - transpiler custom .swcrc", async function
   process.env.METEOR_MODERN = currentMeteorModern;
 });
 
+selftest.define("modern build stack - transpiler custom swc.config.js", async function () {
+  const currentMeteorModern = process.env.METEOR_MODERN;
+  process.env.METEOR_MODERN = '';
+
+  const s = new Sandbox();
+  await s.init();
+
+  await s.createApp("modern", "modern");
+  await s.cd("modern");
+
+  // Remove the .swcrc file to ensure we're using swc.config.js
+  s.unlink(".swcrc");
+
+  // Write the swc.config.js file with the same configuration
+  await writeSwcConfigJs(s, {
+    jsc: {
+      baseUrl: "./",
+      paths: {
+        "@swcAlias/*": ["swcAlias/*"]
+      }
+    }
+  });
+
+  await writeConfig(s, {
+    modern: true,
+    mainModule: {
+      client: 'client/main.js',
+      server: 'server/alias.js',
+    },
+  });
+
+  const run = s.run();
+
+  run.waitSecs(waitToStart);
+  await run.match("App running at");
+
+  /* custom swc.config.js and alias resolution */
+  await run.match(/alias resolved/, false, true);
+
+  await run.stop();
+
+  process.env.METEOR_MODERN = currentMeteorModern;
+});
+
 selftest.define("modern build stack - transpiler files", async function () {
   process.env.METEOR_MODERN = 'true';
   const s = new Sandbox();
@@ -442,7 +492,7 @@ selftest.define("modern build stack - test swc minifier", async function () {
 
   await s.createApp(appName, "modern");
   await s.cd(appName);
-  
+
   await writeConfig(s, {
     modern: true,
     mainModule: {
@@ -452,7 +502,7 @@ selftest.define("modern build stack - test swc minifier", async function () {
   });
 
   s.set("NODE_INSPECTOR_IPC", "1");
-  
+
   await writeModernConfig(s, {
     minifier: true
   });