import type { DiffSnippet } from "../types/index.js";
/**
 * Извлекает из unified diff тот фрагмент, который содержит указанную строку из HEAD.
 *
 * CHANGE: Refactored to reduce complexity and line count
 * WHY: Original function had 77 lines and complexity 14
 * QUOTE(LINT): "Function has too many lines/complexity"
 * REF: ESLint max-lines-per-function, complexity
 * SOURCE: n/a
 *
 * @param unifiedDiff Полный unified diff в текстовом виде
 * @param targetLine Целевая линия в HEAD (1-based)
 * @returns Фрагмент diff или null, если строка не менялась
 *
 * @invariant targetLine > 0
 *
 * @example
 * ```ts
 * const diff = `@@ -1,3 +1,3 @@
 *  line1
 * -line2
 * +line2 modified
 *  line3`;
 * const snippet = extractDiffSnippet(diff, 2);
 * // Returns snippet with pointerIndex pointing to "line2 modified"
 * @pure true
 * @invariant result === null || result.pointerIndex >= 0
 * @complexity O(n) где n = количество строк в diff
 */
export declare function extractDiffSnippet(unifiedDiff: string, targetLine: number): DiffSnippet | null;
/**
 * Находит первый фрагмент diff из списка кандидатов, содержащий указанную строку HEAD.
 *
 * @param candidates Список текстов unified diff
 * @param targetLine Номер строки в HEAD (1-based)
 * @returns Пара { snippet, index } либо null, если строка не затронута
 *
 * @invariant targetLine > 0
 *
 * @example
 * ```ts
 * const diffs = [diffFromUpstream, diffFromWorkspace, diffFromIndex];
 * const result = pickSnippetForLine(diffs, 42);
 * if (result) {
 *   console.log(`Found in diff #${result.index}`);
 * }
 * @pure true
 * @invariant result === null || result.index >= 0
 * @complexity O(m*n) где m = количество кандидатов, n = количество строк в каждом diff
 */
export declare function pickSnippetForLine(candidates: readonly string[], targetLine: number): {
    readonly snippet: DiffSnippet;
    readonly index: number;
} | null;
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