diff --git a/index.d.ts b/index.d.ts
index 4fe4cd21..f8133789 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -1,191 +1,139 @@
-export type Events =
-  'didReceiveStartCallAction' |
-  'answerCall' |
-  'endCall' |
-  'didActivateAudioSession' |
-  'didDeactivateAudioSession' |
-  'didDisplayIncomingCall' |
-  'didToggleHoldCallAction' |
-  'didPerformDTMFAction' |
-  'didResetProvider' |
-  'checkReachability' |
-  'didPerformSetMutedCallAction' |
-  'didLoadWithEvents';
-
-type HandleType = 'generic' | 'number' | 'email';
-
-interface IOptions {
-  ios: {
-    appName: string,
-    imageName?: string,
-    supportsVideo?: boolean,
-    maximumCallGroups?: string,
-    maximumCallsPerCallGroup?: string,
-    ringtoneSound?: string,
-  },
-  android: {
-    alertTitle: string,
-    alertDescription: string,
-    cancelButton: string,
-    okButton: string,
-    imageName?: string,
-    additionalPermissions: string[],
-  },
-}
-
-export type DidReceiveStartCallActionPayload = { handle: string };
-export type AnswerCallPayload = { callUUID: string };
-export type EndCallPayload = AnswerCallPayload;
-export type DidDisplayIncomingCallPayload = string | undefined;
-export type DidPerformSetMutedCallActionPayload = boolean;
-
-export default class RNCallKeep {
-  static addEventListener(type: Events, handler: (args: any) => void) {
-
-  }
-
-  static removeEventListener(type: Events) {
-
-  }
-
-  static async setup(options: IOptions): Promise<void> {
-
-  }
-
-  static hasDefaultPhoneAccount(): boolean {
-
-  }
-
-  static answerIncomingCall(uuid: string) {
-
-  }
-
-  static registerPhoneAccount(): void {
-
-  }
-
-  static registerAndroidEvents(): void {
-
-  }
-
-  static displayIncomingCall(
-    uuid: string,
-    handle: string,
-    localizedCallerName?: string,
-    handleType?: HandleType,
-    hasVideo?: boolean,
-  ) {
-
-  }
-
-  static startCall(
-    uuid: string,
-    handle: string,
-    contactIdentifier?: string,
-    handleType?: HandleType,
-    hasVideo?: boolean,
-  ) {
-
-  }
-  static updateDisplay(
-    uuid: string,
-    displayName: string,
-    handle: string,
-  ) {
-
-  }
-
-  /**
+declare module 'react-native-callkeep' {
+  export type Events =
+    'didReceiveStartCallAction' |
+    'answerCall' |
+    'endCall' |
+    'didActivateAudioSession' |
+    'didDeactivateAudioSession' |
+    'didDisplayIncomingCall' |
+    'didToggleHoldCallAction' |
+    'didPerformDTMFAction' |
+    'didResetProvider' |
+    'checkReachability' |
+    'didPerformSetMutedCallAction' |
+    'didLoadWithEvents';
+
+  type HandleType = 'generic' | 'number' | 'email';
+
+  interface IOptions {
+    ios: {
+      appName: string,
+      imageName?: string,
+      supportsVideo?: boolean,
+      maximumCallGroups?: string,
+      maximumCallsPerCallGroup?: string,
+      ringtoneSound?: string,
+    },
+    android: {
+      alertTitle: string,
+      alertDescription: string,
+      cancelButton: string,
+      okButton: string,
+      imageName?: string,
+      additionalPermissions: string[],
+    },
+  }
+
+  export type DidReceiveStartCallActionPayload = { handle: string };
+  export type AnswerCallPayload = { callUUID: string };
+  export type EndCallPayload = AnswerCallPayload;
+  export type DidDisplayIncomingCallPayload = string | undefined;
+  export type DidPerformSetMutedCallActionPayload = boolean;
+
+  export default class RNCallKeep {
+    static addEventListener(type: Events, handler: (args: any) => void): void
+
+    static removeEventListener(type: Events): void
+
+    static setup(options: IOptions): Promise<void>
+
+    static hasDefaultPhoneAccount(): boolean
+
+    static answerIncomingCall(uuid: string): void
+
+    static registerPhoneAccount(): void
+
+    static registerAndroidEvents(): void
+
+    static displayIncomingCall(
+      uuid: string,
+      handle: string,
+      localizedCallerName?: string,
+      handleType?: HandleType,
+      hasVideo?: boolean,
+    ): void
+
+    static startCall(
+      uuid: string,
+      handle: string,
+      contactIdentifier?: string,
+      handleType?: HandleType,
+      hasVideo?: boolean,
+    ): void
+
+    static updateDisplay(
+      uuid: string,
+      displayName: string,
+      handle: string,
+    ): void
+
+    /**
      * @description reportConnectedOutgoingCallWithUUID method is available only on iOS.
-  */
-  static reportConnectedOutgoingCallWithUUID(uuid: string) {
-
-  }
+     */
+    static reportConnectedOutgoingCallWithUUID(uuid: string): void
 
-  /**
+    /**
      * @description reportConnectedOutgoingCallWithUUID method is available only on iOS.
-  */
-  static reportConnectingOutgoingCallWithUUID(uuid: string): void {
+     */
+    static reportConnectingOutgoingCallWithUUID(uuid: string): void
 
-  }
-  static reportEndCallWithUUID(uuid: string, reason: number): void {
+    static reportEndCallWithUUID(uuid: string, reason: number): void
 
-  }
+    static rejectCall(uuid: string): void
 
-  static rejectCall(uuid: string) {
-
-  }
+    static endCall(uuid: string): void
 
-  static endCall(uuid: string) {
+    static endAllCalls(): void
 
-  }
-
-  static endAllCalls() {
-
-  }
+    static setReachable(): void
 
-  static setReachable() {
+    static isCallActive(uuid: string): Promise<boolean>
 
-  }
-  static isCallActive(uuid: string): Promise<boolean> {
-
-  }
-  /**
+    /**
      * @description supportConnectionService method is available only on Android.
-  */
-  static supportConnectionService(): boolean {
-
-  }
+     */
+    static supportConnectionService(): boolean
 
-  /**
+    /**
      * @description hasPhoneAccount method is available only on Android.
-  */
-  static async hasPhoneAccount(): Promise<boolean> {
-
-  }
+     */
+    static hasPhoneAccount(): Promise<boolean>
 
-  static async hasOutgoingCall(): Promise<boolean> {
+    static hasOutgoingCall(): Promise<boolean>
 
-  }
-
-  /**
+    /**
      * @description setMutedCall method is available only on iOS.
-  */
-  static setMutedCall(uuid: string, muted: boolean) {
-
-  }
-
-  static setOnHold(uuid: string, held: boolean) {
+     */
+    static setMutedCall(uuid: string, muted: boolean): void
 
-  }
+    static setOnHold(uuid: string, held: boolean): void
 
-  /**
+    /**
      * @descriptions sendDTMF is used to send DTMF tones to the PBX.
-  */
-  static sendDTMF(uuid: string, key: string) {
-
-  }
-
-  static checkIfBusy(): Promise<boolean> {
+     */
+    static sendDTMF(uuid: string, key: string): void
 
-  }
-
-  static checkSpeaker(): Promise<boolean> {
+    static checkIfBusy(): Promise<boolean>
 
-  }
+    static checkSpeaker(): Promise<boolean>
 
-  /**
+    /**
      * @description setAvailable method is available only on Android.
-  */
-  static setAvailable(active: boolean) {
-
-  }
-
-  static setCurrentCallActive(callUUID: string) {
-
-  }
+     */
+    static setAvailable(active: boolean): void
 
-  static backToForeground() {
+    static setCurrentCallActive(callUUID: string): void
 
+    static backToForeground(): void
   }
 }