/**
 * Diff computation, line counting, and threshold decisions.
 */
import type { PiTsLintConfig } from "./config.js";
/**
 * Count the number of lines that differ between two strings.
 * Uses the `diff` library's `diffLines` to compute a line-level diff,
 * then counts the total lines that are added or removed.
 * This correctly handles insertions, deletions, and moves without
 * inflating the count due to positional shifts.
 */
export declare function countModifiedLines(oldContent: string, newContent: string): number;
/**
 * Generate a unified diff string between two file contents.
 * Uses the `diff` library's `diffLines` and formats the output
 * in a simple, readable format that the model can easily correlate
 * with compilation error line numbers.
 */
export declare function getDiffString(oldContent: string, newContent: string): string;
/**
 * Determine whether the diff should be included in the error message.
 * The diff is included only when the change is large enough to need context
 * AND small enough to be useful.
 * All three conditions must be met:
 *   1. Error count >= MIN_ERRORS_TO_SHOW (need correlation)
 *   2. Modified lines <= MAX_ABSOLUTE_LINES (diff fits)
 *   3. Modified lines / total lines of new file <= MAX_PERCENTAGE (diff is readable)
 */
export declare function shouldIncludeDiff(errorCount: number, modifiedLines: number, totalLinesNewFile: number, diffThreshold: PiTsLintConfig["diffThreshold"]): boolean;
/**
 * Determine whether linting should be performed based on change complexity.
 * Linting is performed only when the change is large enough to justify the cost.
 * A change is considered "large" only when BOTH conditions are met:
 *   1. Modified lines >= MIN_ABSOLUTE_LINES
 *   2. Modified lines / total lines >= MIN_PERCENTAGE
 */
export declare function shouldLint(existingContent: string, newContent: string, changeComplexity: PiTsLintConfig["changeComplexity"]): boolean;