From 5fc10ca4d6fdcfae9ebbebd9964be8ed5588a502 Mon Sep 17 00:00:00 2001
From: Hiroki Osame <hiroki.osame@gmail.com>
Date: Wed, 13 Dec 2023 14:53:19 +0900
Subject: [PATCH] module: load source maps in `commonjs` translator

PR-URL: https://github.com/nodejs/node/pull/51033
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Geoffrey Booth <webadmin@geoffreybooth.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>
---
 lib/internal/modules/esm/translators.js  |  2 ++
 test/es-module/test-esm-loader-hooks.mjs | 33 ++++++++++++++++++++++++
 2 files changed, 35 insertions(+)

diff --git a/lib/internal/modules/esm/translators.js b/lib/internal/modules/esm/translators.js
index 949dbab7f6ad6b..47906cff86a225 100644
--- a/lib/internal/modules/esm/translators.js
+++ b/lib/internal/modules/esm/translators.js
@@ -289,6 +289,8 @@ function createCJSModuleWrap(url, source, isMain, loadCJS = loadCJSModule) {
   // In case the source was not provided by the `load` step, we need fetch it now.
   source = stringify(source ?? getSource(new URL(url)).source);
 
+  maybeCacheSourceMap(url, source);
+
   const { exportNames, module } = cjsPreparseModuleExports(filename, source);
   cjsCache.set(url, module);
   const namesWithDefault = exportNames.has('default') ?
diff --git a/test/es-module/test-esm-loader-hooks.mjs b/test/es-module/test-esm-loader-hooks.mjs
index d5fee004392b44..8e616c0d517823 100644
--- a/test/es-module/test-esm-loader-hooks.mjs
+++ b/test/es-module/test-esm-loader-hooks.mjs
@@ -737,6 +737,39 @@ describe('Loader hooks', { concurrency: true }, () => {
     assert.strictEqual(signal, null);
   });
 
+  it('should support source maps in commonjs translator', async () => {
+    const readFile = async () => {};
+    const hook = `
+    import { readFile } from 'node:fs/promises';
+    export ${
+  async function load(url, context, nextLoad) {
+    const resolved = await nextLoad(url, context);
+    if (context.format === 'commonjs') {
+      resolved.source = await readFile(new URL(url));
+    }
+    return resolved;
+  }
+}`;
+
+    const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
+      '--no-warnings',
+      '--enable-source-maps',
+      '--import',
+      `data:text/javascript,${encodeURIComponent(`
+      import{ register } from "node:module";
+      register(${
+  JSON.stringify('data:text/javascript,' + encodeURIComponent(hook))
+});
+      `)}`,
+      fixtures.path('source-map/throw-on-require.js'),
+    ]);
+
+    assert.strictEqual(stdout, '');
+    assert.match(stderr, /throw-on-require\.ts:9:9/);
+    assert.strictEqual(code, 1);
+    assert.strictEqual(signal, null);
+  });
+
   it('should handle mixed of opt-in modules and non-opt-in ones', async () => {
     const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
       '--no-warnings',