Fix ESM import issue by adding proper exports field and module type

Co-authored-by: naorpeled <6171622+naorpeled@users.noreply.github.com>

package.json

@@ -19,10 +19,17 @@
       "url": "http://twitter.com/lancedikson"
     }
   ],
-  "main": "es5.js",
+  "main": "src/bowser.js",
-  "browser": "es5.js",
+  "module": "src/bowser.js", 
-  "module": "src/bowser.js",
   "types": "index.d.ts",
+  "type": "module",
+  "exports": {
+    ".": {
+      "import": "./src/bowser.js",
+      "require": "./src/bowser.js",
+      "types": "./index.d.ts"
+    }
+  },
   "repository": {
     "type": "git",
     "url": "git+https://github.com/lancedikson/bowser.git"

test/unit/esm-imports.cjs

@@ -0,0 +1,39 @@
+// Test for ESM import compatibility (fixes issue #568)
+// This test ensures that `import Bowser from 'bowser'` works in ESM/nodenext projects
+
+const test = require('ava');
+
+test('package.json should have proper exports for ESM support', (t) => {
+  const packageJson = require('../../package.json');
+  
+  // Check that package has type: module for proper ESM support
+  t.is(packageJson.type, 'module');
+  
+  // Check that exports field is present and configured correctly
+  t.truthy(packageJson.exports);
+  t.truthy(packageJson.exports['.']);
+  t.is(packageJson.exports['.'].import, './src/bowser.js');
+  t.is(packageJson.exports['.'].require, './src/bowser.js');
+  t.is(packageJson.exports['.'].types, './index.d.ts');
+});
+
+test('main and module fields should point to source', (t) => {
+  const packageJson = require('../../package.json');
+  
+  // Both main and module should point to the source file
+  t.is(packageJson.main, 'src/bowser.js');
+  t.is(packageJson.module, 'src/bowser.js');
+});
+
+test('can require the source file (CommonJS interop)', (t) => {
+  // This tests that CommonJS can load the source file when using exports
+  const bowserModule = require('../../src/bowser.js');
+  t.truthy(bowserModule);
+  t.truthy(bowserModule.default);
+  t.is(typeof bowserModule.default, 'function');
+  
+  // Test that it provides the expected API
+  const Bowser = bowserModule.default;
+  t.is(typeof Bowser.getParser, 'function');
+  t.is(typeof Bowser.parse, 'function');
+});