Use JS script

.eslintrc

@@ -13,6 +13,7 @@
     "plugin:react/recommended",
     "prettier"
   ],
+  "exclude": ["scripts/*.js"],
   "rules": {
     "deprecation/deprecation": "error",
     "react-hooks/rules-of-hooks": "error",

scripts/fix-exports-type.js

@@ -0,0 +1,23 @@
+#!/usr/bin/env node
+// This script defines the type of exports in the dist directory using minimal
+// package.json files. Setting the type in the main package.json file does not
+// work because we want to support both CommonJS and ES Module exports in the
+// same package.
+
+const FS = require('node:fs')
+
+const DIST_DIR = 'dist'
+
+FS.writeFileSync(
+  `${DIST_DIR}/cjs/package.json`,
+  JSON.stringify({
+    type: 'commonjs',
+  }),
+)
+
+FS.writeFileSync(
+  `${DIST_DIR}/esm/package.json`,
+  JSON.stringify({
+    type: 'module',
+  }),
+)