From f884af6b9746336ee126c20f4f70768081926eb7 Mon Sep 17 00:00:00 2001
From: Josh Vlk <josh@vlkpack.com>
Date: Sat, 18 May 2024 10:25:07 -0400
Subject: [PATCH] Add section to README explaining settings to support ESM and
 CJS

---
 README.md | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/README.md b/README.md
index e165244d..6ba0b53d 100644
--- a/README.md
+++ b/README.md
@@ -70,6 +70,12 @@ Open it so it's available in the global scope.
  }
 ```
 
+## ESM and CJS
+To use this library with CommonJS modules you should set the file extension in your project's `rescript.json` to `.res.js`, `.js`, `.res.cjs`, or `.cjs`. This will work with older versions of Node and most web projects using a bundler.
+
+To use this library with EcmaScript modules you should set the file extension in your project's `rescript.json` to `.res.mjs`, or `.mjs`.
+This will work with newer versions of Node and web projects using a modern bundler like Vite.
+
 ## What it looks like
 
 All relevant standard library modules are designed to be available directly in