[Home](./index.md) > [@firebase/auth-types](./auth-types.md) > [RecaptchaVerifier](./auth-types.recaptchaverifier.md) > [(constructor)](./auth-types.recaptchaverifier._constructor_.md) ## RecaptchaVerifier.(constructor) Constructs a new instance of the `RecaptchaVerifier` class Signature: ```typescript constructor( container: any | string, parameters?: Object | null, auth?: Auth | null ); ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | container | any \| string | | | parameters | Object \| null | | | auth | [Auth](./auth-types.auth.md) \| null | |