export type WeekStartSource = "account" | "cache" | "fallback";
export interface WeekStart {
    /** 0=Sunday … 6=Saturday. */
    day: number;
    label: string;
    source: WeekStartSource;
}
/**
 * Resolve the account's week-start day, preferring a fresh cache entry.
 * Never throws: any failure degrades to Monday with `source: "fallback"`, which
 * the caller discloses in its output.
 */
export declare function resolveWeekStart(account: string): Promise<WeekStart>;