import { SegmentType } from './DateField.types';
export interface TryAppendDigitResult {
    /** Buffer state after the append. Unchanged when `rejected` is true. */
    newBuffer: string;
    /** True when the segment completed and focus should auto-advance. */
    shouldAdvance: boolean;
    /** True when the digit was refused (invalid char, out-of-range, buffer full). */
    rejected: boolean;
}
/**
 * Per-segment input validation with intermediate-state awareness. Decides
 * whether a typed digit is accepted (buffer grows), accepted-with-pad (e.g.
 * "5" in empty month → "05"), or rejected ("13" for month).
 *
 * Pure; entirely driven by the (type, buffer, digit) tuple. Cross-segment
 * validity (Feb 30) is NOT checked here — that's `deriveValue`'s job.
 *
 * - Day uses a fixed max of 31; month-dependent day max is intentionally
 *   deferred — invalid combinations surface as cross-segment errors.
 * - Year accepts any 4-digit value 0000-9999; `minDate`/`maxDate` narrow the
 *   date as a whole on blur, not the digits accepted here.
 */
export declare const tryAppendDigit: (type: SegmentType, buffer: string, digit: string) => TryAppendDigitResult;
/** Re-export so `formatSegment` and `tryAppendDigit` share the same max-length
 *  constants without a circular dep. */
export declare const SEGMENT_MAX_LENGTH: Record<SegmentType, number>;