diff --git a/src/@ionic-native/plugins/android-fingerprint-auth/index.ts b/src/@ionic-native/plugins/android-fingerprint-auth/index.ts
index 2366e86bb..f29fb17f2 100644
--- a/src/@ionic-native/plugins/android-fingerprint-auth/index.ts
+++ b/src/@ionic-native/plugins/android-fingerprint-auth/index.ts
@@ -1,9 +1,7 @@
 import { Injectable } from '@angular/core';
-import { Cordova, Plugin, IonicNativePlugin } from '@ionic-native/core';
-
+import { Cordova, IonicNativePlugin, Plugin } from '@ionic-native/core';
 
 export interface AFAAuthOptions {
-
   /**
    * Required
    * Used as the alias for your key in the Android Key Store.
@@ -62,7 +60,6 @@ export interface AFAAuthOptions {
    * Set the hint displayed by the fingerprint icon on the fingerprint authentication dialog.
    */
   dialogHint?: string;
-
 }
 
 export interface AFADecryptOptions {
@@ -96,6 +93,17 @@ export interface AFAEncryptResponse {
   token: string;
 }
 
+export interface AFAAvailableResponse {
+  isAvailable: boolean;
+  isHardwareDetected: boolean;
+  hasEnrolledFingerprints: boolean;
+}
+
+export interface AFADeleteOptions {
+  clientId: string;
+  username: string;
+}
+
 /**
  * @name Android Fingerprint Auth
  * @description
@@ -139,6 +147,8 @@ export interface AFAEncryptResponse {
  * AFAAuthOptions
  * AFAEncryptResponse
  * AFADecryptOptions
+ * AFAAvailableResponse
+ * AFADeleteOptions
  */
 @Plugin({
   pluginName: 'AndroidFingerprintAuth',
@@ -149,55 +159,63 @@ export interface AFAEncryptResponse {
 })
 @Injectable()
 export class AndroidFingerprintAuth extends IonicNativePlugin {
-
   ERRORS: {
-    BAD_PADDING_EXCEPTION: 'BAD_PADDING_EXCEPTION',
-    CERTIFICATE_EXCEPTION: 'CERTIFICATE_EXCEPTION',
-    FINGERPRINT_CANCELLED: 'FINGERPRINT_CANCELLED',
-    FINGERPRINT_DATA_NOT_DELETED: 'FINGERPRINT_DATA_NOT_DELETED',
-    FINGERPRINT_ERROR: 'FINGERPRINT_ERROR',
-    FINGERPRINT_NOT_AVAILABLE: 'FINGERPRINT_NOT_AVAILABLE',
-    FINGERPRINT_PERMISSION_DENIED: 'FINGERPRINT_PERMISSION_DENIED',
-    FINGERPRINT_PERMISSION_DENIED_SHOW_REQUEST: 'FINGERPRINT_PERMISSION_DENIED_SHOW_REQUEST',
-    ILLEGAL_BLOCK_SIZE_EXCEPTION: 'ILLEGAL_BLOCK_SIZE_EXCEPTION',
-    INIT_CIPHER_FAILED: 'INIT_CIPHER_FAILED',
-    INVALID_ALGORITHM_PARAMETER_EXCEPTION: 'INVALID_ALGORITHM_PARAMETER_EXCEPTION',
-    IO_EXCEPTION: 'IO_EXCEPTION',
-    JSON_EXCEPTION: 'JSON_EXCEPTION',
-    MINIMUM_SDK: 'MINIMUM_SDK',
-    MISSING_ACTION_PARAMETERS: 'MISSING_ACTION_PARAMETERS',
-    MISSING_PARAMETERS: 'MISSING_PARAMETERS',
-    NO_SUCH_ALGORITHM_EXCEPTION: 'NO_SUCH_ALGORITHM_EXCEPTION',
-    SECURITY_EXCEPTION: 'SECURITY_EXCEPTION'
+    BAD_PADDING_EXCEPTION: 'BAD_PADDING_EXCEPTION';
+    CERTIFICATE_EXCEPTION: 'CERTIFICATE_EXCEPTION';
+    FINGERPRINT_CANCELLED: 'FINGERPRINT_CANCELLED';
+    FINGERPRINT_DATA_NOT_DELETED: 'FINGERPRINT_DATA_NOT_DELETED';
+    FINGERPRINT_ERROR: 'FINGERPRINT_ERROR';
+    FINGERPRINT_NOT_AVAILABLE: 'FINGERPRINT_NOT_AVAILABLE';
+    FINGERPRINT_PERMISSION_DENIED: 'FINGERPRINT_PERMISSION_DENIED';
+    FINGERPRINT_PERMISSION_DENIED_SHOW_REQUEST: 'FINGERPRINT_PERMISSION_DENIED_SHOW_REQUEST';
+    ILLEGAL_BLOCK_SIZE_EXCEPTION: 'ILLEGAL_BLOCK_SIZE_EXCEPTION';
+    INIT_CIPHER_FAILED: 'INIT_CIPHER_FAILED';
+    INVALID_ALGORITHM_PARAMETER_EXCEPTION: 'INVALID_ALGORITHM_PARAMETER_EXCEPTION';
+    IO_EXCEPTION: 'IO_EXCEPTION';
+    JSON_EXCEPTION: 'JSON_EXCEPTION';
+    MINIMUM_SDK: 'MINIMUM_SDK';
+    MISSING_ACTION_PARAMETERS: 'MISSING_ACTION_PARAMETERS';
+    MISSING_PARAMETERS: 'MISSING_PARAMETERS';
+    NO_SUCH_ALGORITHM_EXCEPTION: 'NO_SUCH_ALGORITHM_EXCEPTION';
+    SECURITY_EXCEPTION: 'SECURITY_EXCEPTION';
   };
 
   /**
    * Opens a native dialog fragment to use the device hardware fingerprint scanner to authenticate against fingerprints registered for the device.
-   * @param options {AFAAuthOptions} Options
-   * @returns {Promise<any>}
+   * @param {AFAAuthOptions} options Options
+   * @returns {Promise<AFAEncryptResponse>}
    */
   @Cordova()
-  encrypt(options: AFAAuthOptions): Promise<AFAEncryptResponse> { return; }
+  encrypt(options: AFAAuthOptions): Promise<AFAEncryptResponse> {
+    return;
+  }
 
   /**
    * Opens a native dialog fragment to use the device hardware fingerprint scanner to authenticate against fingerprints registered for the device.
-   * @param options {AFAAuthOptions} Options
-   * @returns {Promise<any>}
+   * @param {AFAAuthOptions} options Options
+   * @returns {Promise<AFADecryptOptions>}
    */
   @Cordova()
-  decrypt(options: AFAAuthOptions): Promise<AFADecryptOptions> { return; }
+  decrypt(options: AFAAuthOptions): Promise<AFADecryptOptions> {
+    return;
+  }
 
   /**
    * Check if service is available
-   * @returns {Promise<any>} Returns a Promise that resolves if fingerprint auth is available on the device
+   * @returns {Promise<AFAAvailableResponse>} Returns a Promise that resolves if fingerprint auth is available on the device
    */
   @Cordova()
-  isAvailable(): Promise<{ isAvailable: boolean, isHardwareDetected: boolean, hasEnrolledFingerprints: boolean }> { return; }
+  isAvailable(): Promise<AFAAvailableResponse> {
+    return;
+  }
 
   /**
    * Delete the cipher used for encryption and decryption by username
-   * @returns {Promise<any>} Returns a Promise that resolves if the cipher was successfully deleted
+   * @param {AFADeleteOptions} options Options
+   * @returns {Promise<{ deleted: boolean }>} Returns a Promise that resolves if the cipher was successfully deleted
    */
   @Cordova()
-  delete(options: { clientId: string; username: string; }): Promise<{ deleted: boolean }> { return; }
+  delete(options: AFADeleteOptions): Promise<{ deleted: boolean }> {
+    return;
+  }
 }