diff --git a/index.d.ts b/index.d.ts
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+// Type definitions for react-native-prompt-android 0.3.1
+// Project: https://github.com/shimohq/react-native-prompt-android
+// Definitions by: Krystof Celba <https://github.com/krystofcelba>
+// TypeScript Version: 2.6.1
+
+type PromptButton = {
+  text?: string;
+  onPress?: (message: string) => void;
+
+  /** @platform ios */
+  style?: 'default' | 'cancel' | 'destructive';
+};
+
+type PromptType = 'default' | 'plain-text' | 'secure-text';
+type PromptTypeIOS = 'login-password';
+type PromptTypeAndroid = 'numeric' | 'email-address' | 'phone-pad';
+
+type PromptStyleAndroid = 'default' | 'shimo';
+
+export interface PromptOptions {
+  /**
+   * * Cross platform:
+   *
+   * - `'default'`
+   * - `'plain-text'`
+   * - `'secure-text'`
+   *
+   * * iOS only:
+   *
+   * - `'login-password'`
+   *
+   * * Android only:
+   *
+   * - `'numeric'`
+   * - `'email-address'`
+   * - `'phone-pad'`
+   */
+  type?: PromptType | PromptTypeIOS | PromptTypeAndroid;
+
+  defaultValue?: string;
+
+  /** @platform android */
+  placeholder?: string;
+
+  /** @platform android */
+  cancelable?: boolean;
+
+  /** @platform android */
+  style?: PromptStyleAndroid;
+}
+
+declare function prompt(
+  title?: string,
+  message?: string,
+  callbackOrButtons?: ((value: string) => void) | Array<PromptButton>,
+  options?: PromptOptions,
+): void;
+
+export default prompt;