import { IFormattedTime } from '../lib/time-format';
export type TimerVariant = 'timer' | 'countdown' | 'stopwatch';
export type ILap = {
    number: number;
    durationMs: number;
    cumulativeMs: number;
    formatted: IFormattedTime;
};
export type TimerState = {
    variant: TimerVariant;
    isRunning: boolean;
    elapsedMs: number;
    durationMs: number;
    isComplete: boolean;
    laps: readonly ILap[];
    previousLapMs: number;
};
export type TimerAction = {
    type: 'tick';
    deltaMs: number;
} | {
    type: 'start';
} | {
    type: 'stop';
} | {
    type: 'reset';
} | {
    type: 'toggle';
} | {
    type: 'lap';
} | {
    type: 'restart';
};
export declare function timerReducer(state: TimerState, action: TimerAction): TimerState;
export declare function createInitialTimerState(options: {
    variant?: TimerVariant;
    durationMs?: number;
    autoStart?: boolean;
}): TimerState;
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