[Home](./index.md) > [@firebase/auth-types](./auth-types.md) > [ActionCodeOperation](./auth-types.actioncodeoperation.md) ## ActionCodeOperation enum An enumeration of the possible email action types. Signature: ```typescript export const enum ActionCodeOperation ``` ## Enumeration Members | Member | Value | Description | | --- | --- | --- | | EMAIL\_SIGNIN | 'EMAIL_SIGNIN' | The email link sign-in action. | | PASSWORD\_RESET | 'PASSWORD_RESET' | The password reset action. | | RECOVER\_EMAIL | 'RECOVER_EMAIL' | The email revocation action. | | REVERT\_SECOND\_FACTOR\_ADDITION | 'REVERT_SECOND_FACTOR_ADDITION' | The revert second factor addition email action. | | VERIFY\_AND\_CHANGE\_EMAIL | 'VERIFY_AND_CHANGE_EMAIL' | The revert second factor addition email action. | | VERIFY\_EMAIL | 'VERIFY_EMAIL' | The email verification action. |