voluptasmollitia/docs-exp/auth.multifactorresolver.resolvesignin.md

Monorepo for the Firebase JavaScript SDK

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[Home](./index.md) &gt; [@firebase/auth](./auth.md) &gt; [MultiFactorResolver](./auth.multifactorresolver.md) &gt; [resolveSignIn](./auth.multifactorresolver.resolvesignin.md)

## MultiFactorResolver.resolveSignIn() method

A helper function to help users complete sign in with a second factor using an [MultiFactorAssertion](./auth.multifactorassertion.md) confirming the user successfully completed the second factor challenge.

<b>Signature:</b>

```typescript
resolveSignIn(assertion: MultiFactorAssertion): Promise<UserCredential>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  assertion | [MultiFactorAssertion](./auth.multifactorassertion.md) | The multi-factor assertion to resolve sign-in with. |

<b>Returns:</b>

Promise&lt;[UserCredential](./auth.usercredential.md)<!-- -->&gt;

The promise that resolves with the user credential object.

## Example


```javascript
const phoneAuthCredential = PhoneAuthProvider.credential(verificationId, verificationCode);
const multiFactorAssertion = PhoneMultiFactorGenerator.assertion(phoneAuthCredential);
const userCredential = await resolver.resolveSignIn(multiFactorAssertion);

```