From f7efaec80e7853643efe99c7c28e646294f4918e Mon Sep 17 00:00:00 2001
From: Bryan English <bryan.english@datadoghq.com>
Date: Tue, 23 Sep 2025 14:07:54 -0400
Subject: [PATCH] fix: use createRequire to load hook.js

If import is used to load hook.js, then any loaders that assign
`result.source` (as indicated by the Node.js docs) on CommonJS files
will cause a not-implemented error to be thrown inside Node.js. This is
probably a bug in Node.js, but this ought to be an appropriate
workaround (espectially since IITM supports old versions of Node.js).
---
 hook.mjs                        |  4 +++-
 test/fixtures/double-loader.mjs |  9 +++++++++
 test/other/double-loading.mjs   | 15 +++++++++++++++
 3 files changed, 27 insertions(+), 1 deletion(-)
 create mode 100644 test/fixtures/double-loader.mjs
 create mode 100644 test/other/double-loading.mjs

diff --git a/hook.mjs b/hook.mjs
index 37acec3..ce44316 100644
--- a/hook.mjs
+++ b/hook.mjs
@@ -2,7 +2,9 @@
 //
 // This product includes software developed at Datadog (https://www.datadoghq.com/). Copyright 2021 Datadog, Inc.
 
-import { createHook } from './hook.js'
+import { createRequire } from 'node:module'
+const require = createRequire(import.meta.url)
+const { createHook } = require('./hook.js')
 
 const { initialize, load, resolve, getFormat, getSource } = createHook(import.meta)
 
diff --git a/test/fixtures/double-loader.mjs b/test/fixtures/double-loader.mjs
new file mode 100644
index 0000000..8b85c2d
--- /dev/null
+++ b/test/fixtures/double-loader.mjs
@@ -0,0 +1,9 @@
+import { readFile } from 'fs/promises'
+
+export async function load (url, context, nextLoad) {
+  const result = await nextLoad(url, context)
+  if (!result.source && url.startsWith('file:')) {
+    result.source = await readFile(new URL(url))
+  }
+  return result
+}
diff --git a/test/other/double-loading.mjs b/test/other/double-loading.mjs
new file mode 100644
index 0000000..48e3ca0
--- /dev/null
+++ b/test/other/double-loading.mjs
@@ -0,0 +1,15 @@
+// Unless explicitly stated otherwise all files in this repository are licensed under the Apache 2.0 License.
+//
+// This product includes software developed at Datadog (https://www.datadoghq.com/). Copyright 2021 Datadog, Inc.
+
+import { execSync } from 'child_process'
+import { doesNotThrow } from 'assert'
+
+const env = {
+  ...process.env,
+  NODE_OPTIONS: '--no-warnings --experimental-loader ./test/fixtures/double-loader.mjs --experimental-loader ./hook.mjs'
+}
+
+doesNotThrow(() => {
+  execSync('node -p 0', { env })
+})