module: load source maps in commonjs translator

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') ?

test/es-module/test-esm-loader-hooks.mjs

@@ -747,6 +747,30 @@ describe('Loader hooks', { concurrency: true }, () => {
     assert.strictEqual(signal, null);
   });
 
+  it('should support source maps in commonjs translator', async () => {
+    const readFile = async () => {};
+    const fileURLToPath = () => {};
+    const { code, signal, stdout, stderr } = await spawnPromisified(execPath, [
+      '--no-warnings',
+      '--enable-source-maps',
+      '--experimental-loader',
+      `data:text/javascript,import{readFile}from"node:fs/promises";import{fileURLToPath}from"node:url";export ${
+        async function load(u, c, n) {
+          const r = await n(u, c);
+          if (c.format === 'commonjs') {
+            r.source = await readFile(new URL(u));
+          }
+          return r;
+        }}`,
+      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',