/**
 * Detects a single-letter alphabetic sequence (`A, B, C → D`) and extrapolates
 * it, wrapping `Z → A` and preserving case.
 *
 * Multi-letter sequences (`AA, AB, …`) are intentionally out of scope for v1 and
 * fall through to the copy fallback; the detector architecture leaves room to add
 * a bijective base-26 detector later without touching this one.
 *
 * @packageDocumentation
 */
import type { AutoFillPatternDetector, AutoFillSeries } from './pattern-detector';
import { AutoFillDetectorName } from './pattern-detector';
import type { AutoFillValue, DetectContext } from '../types/autofill.types';
export declare class AlphabetDetector implements AutoFillPatternDetector {
    readonly name = AutoFillDetectorName.Alphabet;
    detect(source: readonly AutoFillValue[], _ctx: DetectContext): AutoFillSeries | null;
}
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