import { default as React } from 'react';
import { ContentRef } from '../content/types';
export type PowerMode = 'shutdown' | 'restart' | 'logout';
export type PowerSequenceItem = {
    kind: 'audio';
    src: ContentRef;
    delayMs?: number;
    durationMs?: number;
    captions?: string;
} | {
    kind: 'text';
    text?: string;
    textKey?: string;
    delayMs?: number;
    durationMs?: number;
};
export interface PowerSequence {
    blackoutAfterMs?: number;
    reload?: 'immediate' | 'after-sequence' | 'manual';
    maxDurationMs?: number;
    blackout?: PowerSequenceItem[];
}
export interface PowerTransitionApi {
    request: (mode: PowerMode) => void;
    complete: () => void;
    active: boolean;
    text: string;
}
export declare const PowerTransitionProvider: React.FC<{
    children: React.ReactNode;
    sequence?: PowerSequence;
}>;
export declare const usePowerTransition: () => PowerTransitionApi;
/** Optional variant for shell components rendered in isolation by embedders/tests. */
export declare const useOptionalPowerTransition: () => PowerTransitionApi | undefined;