export interface FreezeSubject {
    id: string;
    groundSpeed: number;
}
export interface FreezeViolation {
    id: string;
    speed: number;
    movedSeconds: number;
}
/** Plain JSON state of a {@link FreezeMonitor}: seconds each frozen subject has kept moving. */
export interface FreezeMonitorState {
    moved: Record<string, number>;
}
export interface FreezeMonitor {
    tick(subjects: readonly FreezeSubject[], frozenIds: ReadonlySet<string>, dt: number): FreezeViolation[];
    reset(id?: string): void;
    snapshot(): FreezeMonitorState;
    restore(next: FreezeMonitorState): void;
}
/** @internal */
export declare function createFreezeMonitor(config?: {
    toleranceSpeed?: number;
    graceSeconds?: number;
}): FreezeMonitor;