diff --git a/internals.d.ts b/internals.d.ts
new file mode 100644
index 0000000..2213527
--- /dev/null
+++ b/internals.d.ts
@@ -0,0 +1 @@
+export * from './dist/cjs/internals.js';
diff --git a/internals.js b/internals.js
new file mode 100644
index 0000000..7a8c8de
--- /dev/null
+++ b/internals.js
@@ -0,0 +1 @@
+module.exports = require('./dist/cjs/internals');
diff --git a/package.json b/package.json
index 7446284..1c6effc 100644
--- a/package.json
+++ b/package.json
@@ -17,8 +17,14 @@
       }
     },
     "./internals": {
-      "types": "./dist/esm/internals.d.ts",
-      "import": "./src/internals.js"
+      "import": {
+        "types": "./dist/esm/internals.d.ts",
+        "default": "./dist/esm/internals.js"
+      },
+      "require": {
+        "types": "./dist/cjs/internals.d.ts",
+        "default": "./dist/cjs/internals.js"
+      }
     }
   },
   "browser": "./dist/regex.min.js",
@@ -27,18 +33,22 @@
   "scripts": {
     "bundle:global": "esbuild src/regex.js --global-name=Regex --bundle --minify --sourcemap --outfile=dist/regex.min.js",
     "bundle:esm": "esbuild src/regex.js --format=esm --bundle --sourcemap --outfile=dist/esm/regex.js",
+    "bundle:esm:internals": "esbuild src/regex.js --format=esm --bundle --sourcemap --outfile=dist/esm/internals.js",
     "bundle:cjs": "esbuild src/regex.js --format=cjs --bundle --sourcemap --outfile=dist/cjs/regex.js",
+    "bundle:cjs:internals": "esbuild src/internals.js --format=cjs --bundle --sourcemap --outfile=dist/cjs/internals.js",
     "types": "tsc src/regex.js src/internals.js --rootDir src --declaration --allowJs --emitDeclarationOnly --outDir types",
     "prebuild": "rm -rf dist/* types/*",
-    "build": "pnpm run bundle:global && pnpm run bundle:esm && pnpm run bundle:cjs && pnpm run types",
+    "build": "pnpm run bundle:global && pnpm run bundle:esm && pnpm run bundle:cjs && pnpm run bundle:esm:internals && pnpm run bundle:cjs:internals && pnpm run types",
     "postbuild": "node scripts/postbuild.js",
     "pretest": "pnpm run build",
-    "test": "jasmine && tsc --project spec/types/tsconfig.test.json && attw --pack . --entrypoints .",
+    "test": "jasmine && tsc --project spec/types/tsconfig.test.json && attw --pack . --entrypoints . internals",
     "prepublishOnly": "pnpm test"
   },
   "files": [
     "dist",
-    "src"
+    "src",
+    "internals.d.ts",
+    "internals.js"
   ],
   "repository": {
     "type": "git",