/** Two dates that have to stay in order, and the draft that is not a range until both are known. */
export interface MdyDateRangeValue {
    readonly start: string | null;
    readonly end: string | null;
}
/** Canonical range transition: bounds/filter invalid dates and keep end >= start. */
export declare function dateRangeValueTransition(value: MdyDateRangeValue, options?: {
    readonly minIso?: string | null;
    readonly maxIso?: string | null;
    readonly accepts?: ((iso: string) => boolean) | null;
}): MdyDateRangeValue;
export interface MdyDateRangeDraftState {
    readonly committed: MdyDateRangeValue;
    readonly draft: MdyDateRangeValue;
    readonly open: boolean;
}
export type MdyDateRangeDraftIntent = {
    readonly type: "open";
    readonly committed: MdyDateRangeValue;
} | {
    readonly type: "select";
    readonly value: MdyDateRangeValue;
} | {
    readonly type: "confirm";
} | {
    readonly type: "cancel";
};
export interface MdyDateRangeDraftTransition {
    readonly state: MdyDateRangeDraftState;
    readonly commit: MdyDateRangeValue | undefined;
    readonly restoreFocus: boolean;
}
/** Modal date-range draft policy. Incomplete drafts close without committing. */
export declare function dateRangeDraftTransition(state: MdyDateRangeDraftState, intent: MdyDateRangeDraftIntent, options?: {
    readonly minIso?: string | null;
    readonly maxIso?: string | null;
    readonly accepts?: ((iso: string) => boolean) | null;
}): MdyDateRangeDraftTransition;