/**
 * Shows the native Android in-app update popup using the Play Core API.
 *
 * @param type - (Optional) The update type to use:
 *   - `'immediate'` (default): Forces the user to update immediately before continuing.
 *   - `'flexible'`: Allows the user to continue using the app while the update is downloaded in the background.
 *
 * @returns A Promise that resolves when the update flow is started, or rejects if not available or fails.
 */
export declare const showUpdatePopup: (type?: "immediate" | "flexible") => Promise<void>;
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