export declare const MDY_CALENDAR_ISSUE: {
    /** The week starts on a day the locale does not start on. */
    readonly weekStartsWrong: "CALENDAR_WEEK_START_IGNORES_LOCALE";
};
export type MdyCalendarIssueCode = (typeof MDY_CALENDAR_ISSUE)[keyof typeof MDY_CALENDAR_ISSUE];
export interface MdyCalendarIssue {
    readonly code: MdyCalendarIssueCode;
    readonly detail: string;
}
/**
 * The narrow weekday names a locale's calendar shows, in the order it shows them.
 *
 * 2024-01-01 was a Monday, which is the anchor the day arithmetic below counts from.
 */
export declare function expectedWeekdayOrder(locale: string): readonly string[];
/**
 * Judges a rendered set of weekday headers against the locale they were rendered for.
 *
 * An empty result is a calendar that begins its week where its user's does.
 */
export declare function inspectCalendarWeekStart(rendered: readonly string[], locale: string): readonly MdyCalendarIssue[];