From e0aef4294a00d95bb3ba2baca8a16eb413264d4f Mon Sep 17 00:00:00 2001
From: Will Eastcott <will@playcanvas.com>
Date: Mon, 17 Jun 2024 11:27:05 +0100
Subject: [PATCH] Add cjs build

---
 package.json     | 13 +++++++++----
 rollup.config.js | 29 +++++++++++++++++++++--------
 2 files changed, 30 insertions(+), 12 deletions(-)

diff --git a/package.json b/package.json
index f39a736..590b97d 100644
--- a/package.json
+++ b/package.json
@@ -9,12 +9,16 @@
     "observer"
   ],
   "license": "MIT",
-  "main": "dist/index.js",
+  "main": "./dist/index.cjs",
+  "module": "./dist/index.mjs",
+  "types": "./types/index.d.ts",
   "exports": {
-    ".": "./dist/index.mjs"
+    ".": {
+      "types": "./types/index.d.ts",
+      "import": "./dist/index.mjs",
+      "require": "./dist/index.cjs"
+    }
   },
-  "module": "dist/index.mjs",
-  "types": "types/index.d.ts",
   "type": "module",
   "bugs": {
     "url": "https://github.com/playcanvas/observer/issues"
@@ -31,6 +35,7 @@
     }
   },
   "files": [
+    "dist/index.cjs",
     "dist/index.js",
     "dist/index.mjs",
     "types",
diff --git a/rollup.config.js b/rollup.config.js
index 550c762..706192a 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -1,6 +1,6 @@
 import { babel } from '@rollup/plugin-babel';
 
-const umdOptions = {
+const esmOptions = {
     babelHelpers: 'bundled',
     babelrc: false,
     comments: false,
@@ -9,17 +9,18 @@ const umdOptions = {
     presets: [
         [
             '@babel/preset-env', {
+                bugfixes: true,
                 loose: true,
                 modules: false,
                 targets: {
-                    ie: "11"
+                    esmodules: true
                 }
             }
         ]
     ]
 };
 
-const esmOptions = {
+const nonEsmOptions = {
     babelHelpers: 'bundled',
     babelrc: false,
     comments: false,
@@ -28,11 +29,10 @@ const esmOptions = {
     presets: [
         [
             '@babel/preset-env', {
-                bugfixes: true,
                 loose: true,
                 modules: false,
                 targets: {
-                    esmodules: true
+                    ie: "11"
                 }
             }
         ]
@@ -47,7 +47,19 @@ const umd = {
         name: 'observer'
     },
     plugins: [
-        babel(umdOptions)
+        babel(nonEsmOptions)
+    ]
+};
+
+const cjs = {
+    input: 'src/index.js',
+    output: {
+        file: 'dist/index.cjs',
+        format: 'cjs',
+        name: 'observer'
+    },
+    plugins: [
+        babel(nonEsmOptions)
     ]
 };
 
@@ -62,11 +74,12 @@ const esm = {
     ]
 };
 
-let targets = [umd, esm];
+let targets = [cjs, esm, umd];
 if (process.env.target) {
     switch (process.env.target.toLowerCase()) {
-        case "umd":      targets = [umd]; break;
+        case "cjs":      targets = [cjs]; break;
         case "esm":      targets = [esm]; break;
+        case "umd":      targets = [umd]; break;
     }
 }