From 92c3ce36369e923f74ab3a2d801ae3c55b7c6a5a Mon Sep 17 00:00:00 2001
From: isaacs <i@izs.me>
Date: Fri, 5 May 2023 21:37:04 -0700
Subject: [PATCH] fix: Add globalPreload to ts-node/esm for node 20

As of node v20, loader hooks are executed in a separate isolated thread
environment.  As a result, they are unable to register the
`require.extensions` hooks in a way that would (in other node versions)
make both CJS and ESM work as expected.

By adding a `globalPreload` method, which *does* execute in the main
script environment (but with very limited capabilities), these hooks can
be attached properly, and `--loader=ts-node/esm` will once again make
both cjs and esm typescript programs work properly.
---
 esm.mjs | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/esm.mjs b/esm.mjs
index 0843cf349..e6f205758 100644
--- a/esm.mjs
+++ b/esm.mjs
@@ -6,3 +6,13 @@ const require = createRequire(fileURLToPath(import.meta.url));
 const esm = require('./dist/esm');
 export const { resolve, load, getFormat, transformSource } =
   esm.registerAndCreateEsmHooks();
+
+// Affordance for node 20, where load() happens in an isolated thread
+export const globalPreload = () => {
+  const self = fileURLToPath(import.meta.url);
+  return `
+const { createRequire } = getBuiltin('module');
+const require = createRequire(${JSON.stringify(self)});
+require('./dist/esm').registerAndCreateEsmHooks();
+`;
+};