2 files changed, 23 insertions, 3 deletions
diff --git a/packages/server/src/assertion/generateAssertionOptions.test.ts b/packages/server/src/assertion/generateAssertionOptions.test.ts
index 70a72db..24253bf 100644
--- a/packages/server/src/assertion/generateAssertionOptions.test.ts
+++ b/packages/server/src/assertion/generateAssertionOptions.test.ts
@@ -65,6 +65,25 @@ test('should not set userVerification if not specified', () => {
   expect(options.userVerification).toEqual(undefined);
 });
 
+test('should not set allowCredentials if not specified', () => {
+  const options = generateAssertionOptions({ rpID: 'test' });
+
+  expect(options.allowCredentials).toEqual(undefined);
+});
+
+test('should generate without params', () => {
+  const options = generateAssertionOptions();
+  const { challenge, ...otherFields } = options;
+  expect(otherFields).toEqual({
+    allowCredentials: undefined,
+    extensions: undefined,
+    rpId: undefined,
+    timeout: 60000,
+    userVerification: undefined,
+  });
+  expect(typeof challenge).toEqual('string');
+});
+
 test('should set userVerification if specified', () => {
   const options = generateAssertionOptions({
     challenge: 'totallyrandomvalue',
diff --git a/packages/server/src/assertion/generateAssertionOptions.ts b/packages/server/src/assertion/generateAssertionOptions.ts
index d05dc00..79ff6f8 100644
--- a/packages/server/src/assertion/generateAssertionOptions.ts
+++ b/packages/server/src/assertion/generateAssertionOptions.ts
@@ -9,7 +9,7 @@ import base64url from 'base64url';
 import generateChallenge from '../helpers/generateChallenge';
 
 type Options = {
-  allowCredentials: PublicKeyCredentialDescriptorJSON[];
+  allowCredentials?: PublicKeyCredentialDescriptorJSON[];
   challenge?: string | Buffer;
   timeout?: number;
   userVerification?: UserVerificationRequirement;
@@ -20,7 +20,8 @@ type Options = {
 /**
  * Prepare a value to pass into navigator.credentials.get(...) for authenticator "login"
  *
- * @param allowCredentials Authenticators previously registered by the user
+ * @param allowCredentials Authenticators previously registered by the user, if not provided
+ * device can ask user which credential he wants to use
  * @param challenge Random value the authenticator needs to sign and pass back
  * user for assertion
  * @param timeout How long (in ms) the user can take to complete assertion
@@ -30,7 +31,7 @@ type Options = {
  * @param rpID Valid domain name (after `https://`)
  */
 export default function generateAssertionOptions(
-  options: Options,
+  options: Options = {},
 ): PublicKeyCredentialRequestOptionsJSON {
   const {
     allowCredentials,