Guard domain parsing to resolve TS2532 on malformed email inputs

index.js

@@ -63,7 +63,10 @@ function disposableEmailDetector(email, options) {
                 disposableDomains = yield loadDomains();
             }
             // Extract the domain from the email address
-            const domain = email.split('@')[1].toLowerCase(); // Get the domain part of the email address and convert it to lowercase
+            const domainPart = email.split('@')[1];
+            if (!domainPart)
+                return false;
+            const domain = domainPart.toLowerCase(); // Get the domain part of the email address and convert it to lowercase
             // Check if the domain is in the list of disposable domains 
             return disposableDomains.includes(domain);
         }

index.ts

@@ -55,7 +55,9 @@ export default async function disposableEmailDetector(email: string, options?: O
 
 
     // Extract the domain from the email address
-    const domain = email.split('@')[1].toLowerCase(); // Get the domain part of the email address and convert it to lowercase
+    const domainPart = email.split('@')[1];
+    if (!domainPart) return false;
+    const domain = domainPart.toLowerCase(); // Get the domain part of the email address and convert it to lowercase
 
     // Check if the domain is in the list of disposable domains 
     return disposableDomains.includes(domain);
@@ -74,4 +76,3 @@ export default async function disposableEmailDetector(email: string, options?: O
     return false; 
   }
 }
-

test/package.ts

@@ -1,6 +1,13 @@
-import disposableEmailDetector from 'disposable-email-detector'
+import disposableEmailDetector from '../index'
+import assert from 'assert'
 
 // Test the disposableEmailDetector function
 (async () => {
-  console.log(await disposableEmailDetector('user69@spamavert.com')); // false
-})();
+  assert.strictEqual(await disposableEmailDetector('user@mailinator.com'), true);
+  assert.strictEqual(await disposableEmailDetector('user1@gmail.com'), false);
+  assert.strictEqual(await disposableEmailDetector('invalid-email'), false);
+  assert.strictEqual(await disposableEmailDetector('@'), false);
+  assert.strictEqual(await disposableEmailDetector('user@@example.com'), false);
+  assert.strictEqual(await disposableEmailDetector(''), false);
+  console.log('test package passed');
+})();