Add dual package publishing support for ESM and CommonJS

README.md

@@ -30,6 +30,17 @@ import {recursion} from 'regex-recursion';
 const re = regex({plugins: [recursion]})`…`;
 ```
 
+<details>
+  <summary>Using CommonJS require</summary>
+
+```js
+const {regex} = require('regex');
+const {recursion} = require('regex-recursion');
+
+const re = regex({plugins: [recursion]})`…`;
+```
+</details>
+
 <details>
   <summary>Using a global name (no import)</summary>
 

package.json

@@ -7,20 +7,28 @@
   "type": "module",
   "exports": {
     ".": {
-      "types": "./types/index.d.ts",
-      "import": "./src/index.js"
+      "import": {
+        "types": "./types/index.d.ts",
+        "default": "./src/index.js"
+      },
+      "require": {
+        "types": "./types/index.d.cts",
+        "default": "./dist/cjs/index.cjs"
+      }
     }
   },
+  "main": "./dist/cjs/index.cjs",
   "browser": "./dist/regex-recursion.min.js",
   "types": "./types/index.d.ts",
   "scripts": {
-    "bundle:global": "esbuild src/index.js --global-name=Regex.plugins --bundle --minify --sourcemap --outfile=dist/regex-recursion.min.js",
-    "types": "tsc src/index.js --rootDir src --declaration --allowJs --emitDeclarationOnly --outDir types",
     "prebuild": "rm -rf dist/* types/*",
-    "build": "pnpm run bundle:global && pnpm run types",
+    "build": "pnpm run bundle:global && pnpm run bundle:cjs && pnpm run types",
+    "bundle:cjs": "esbuild src/index.js --format=cjs --bundle --outfile=dist/cjs/index.cjs",
+    "bundle:global": "esbuild src/index.js --global-name=Regex.plugins --bundle --minify --sourcemap --outfile=dist/regex-recursion.min.js",
+    "prepare": "pnpm test",
     "pretest": "pnpm run build",
     "test": "jasmine",
-    "prepare": "pnpm test"
+    "types": "tsc src/index.js --rootDir src --declaration --allowJs --emitDeclarationOnly --outDir types && cp types/index.d.ts types/index.d.cts"
   },
   "files": [
     "dist",

spec/cjs-support-spec.cjs

@@ -0,0 +1,17 @@
+// This file uses CommonJS syntax to test the CJS compatibility
+const {recursion} = require('../dist/cjs/index.cjs');
+
+describe('CommonJS support', () => {
+  it('should export recursion function via require()', () => {
+    expect(typeof recursion).toBe('function');
+  });
+
+  it('should have proper function behavior', () => {
+    const pattern = 'a(?R=2)?b';
+    const result = recursion(pattern);
+
+    expect(result.pattern).toBe('a(?:a(?:)?b)?b');
+    expect(result.captureTransfers instanceof Map).toBe(true);
+    expect(Array.isArray(result.hiddenCaptures)).toBe(true);
+  });
+}); 

spec/esm-support-spec.js

@@ -0,0 +1,19 @@
+// This file uses ESM syntax to test the ESM compatibility
+import { recursion } from '../src/index.js';
+
+describe('ESM support', () => {
+  it('should export recursion function via import', () => {
+    expect(typeof recursion).toBe('function');
+  });
+
+  it('should have proper function behavior', () => {
+    const pattern = 'a(?R=2)?b';
+    const result = recursion(pattern);
+
+    expect(result).toEqual({
+      pattern: 'a(?:a(?:)?b)?b',
+      captureTransfers: jasmine.any(Map),
+      hiddenCaptures: []
+    });
+  });
+}); 

spec/support/jasmine.json

@@ -1,7 +1,8 @@
 {
   "spec_dir": "spec",
   "spec_files": [
-    "*-spec.js"
+    "*-spec.js",
+    "*-spec.cjs"
   ],
   "helpers": [
     "helpers/**/*.?(m)js"