import { type PowerAssertionOptions } from "@oh-my-pi/pi-natives";
/** A held sleep-prevention assertion; the session only needs to release it. */
export interface PowerAssertionHandle {
    stop(): void;
}
/**
 * Start a power assertion. A missing platform backend (headless container with
 * no D-Bus) is logged at debug once and never retried; any other failure still warns.
 */
export declare function startPowerAssertion(options: PowerAssertionOptions, start?: (options: PowerAssertionOptions) => PowerAssertionHandle): PowerAssertionHandle | undefined;
/** Test hook: forget that the backend was found unavailable. */
export declare function resetPowerBackendUnavailableForTests(): void;