export declare function dateWithinBounds(iso: string | null | undefined, minIso: string | null | undefined, maxIso: string | null | undefined): boolean;
export type MdyDateValueIntent = {
    readonly type: "select";
    readonly iso: string;
} | {
    readonly type: "clear";
};
/** Returns the canonical value transition, or null when a selection is rejected by bounds. */
export declare function dateValueTransition(intent: MdyDateValueIntent, minIso?: string | null, maxIso?: string | null): string | null;
export interface MdyDateDraftState {
    readonly committed: string | null;
    readonly draft: string | null;
    readonly open: boolean;
}
export type MdyDateDraftIntent = {
    readonly type: "open";
    readonly committed: string | null;
} | {
    readonly type: "select";
    readonly iso: string;
} | {
    readonly type: "confirm";
} | {
    readonly type: "cancel";
};
export interface MdyDateDraftTransition {
    readonly state: MdyDateDraftState;
    readonly commit: string | null | undefined;
    readonly restoreFocus: boolean;
}
/** Modal date draft policy. Selection stays provisional until confirm; cancel discards it. */
export declare function dateDraftTransition(state: MdyDateDraftState, intent: MdyDateDraftIntent, minIso?: string | null, maxIso?: string | null): MdyDateDraftTransition;