# FieldExtensionType enum

Enumerates the field extension types.

Inheritance
  - Object
  - Enum
  - FieldExtensionType

## Constructors

FieldExtensionType()
  const

## Values

none → const FieldExtensionType

  No information given.

unknown → const FieldExtensionType

  No information given.

image → const FieldExtensionType

  The Image extension specifies the expected type and format of the image data.

portrait → const FieldExtensionType

  The Portrait extension specifies the guidelines to create the portrait image.

biometric → const FieldExtensionType

  The Biometric extension specifies the expected type and format of the biometric data in the payload.

compression → const FieldExtensionType

  The Compression extension specifies the compression parameters.

encryption → const FieldExtensionType

  The Encryption extension is used to maintain the confidentiality of specific data in the payload.

## Properties

hashCode → int
  The hash code for this object.
  no setter inherited
index → int
  A numeric identifier for the enumerated value.
  no setter inherited
runtimeType → Type
  A representation of the runtime type of the object.
  no setter inherited

## Methods

noSuchMethod(Invocation invocation) → dynamic
  Invoked when a nonexistent method or property is accessed.
  inherited
toString() → String
  A string representation of this object.
  inherited

## Operators

operator ==(Object other) → bool
  The equality operator.
  inherited

## Constants

values → const List<FieldExtensionType>
  A constant List of the values in this enum, in order of their declaration.
  `[none, unknown, image, portrait, biometric, compression, encryption]`