/**
 * Diff formatting helpers for Pi hoisted tool renderers.
 *
 * Mirrors the output shape Pi's built-in `renderDiff` expects:
 *   "+NN content"   for added lines
 *   "-NN content"   for removed lines
 *   " NN content"   for context lines
 *   " NN ..."       for context truncation markers
 *
 * We don't re-export Pi's internal `generateDiffString` because it isn't
 * public. Reimplementing it as a thin wrapper around the `diff` npm package
 * (also used by Pi itself) is ~40 lines and keeps us decoupled from Pi's
 * private internals.
 */
export interface FormattedDiff {
    diff: string;
    firstChangedLine: number | undefined;
}
/**
 * Generate a line-numbered diff string suitable for Pi's `renderDiff`.
 * Matches the format of Pi's built-in edit tool result.
 */
export declare function formatDiffForPi(oldContent: string, newContent: string, contextLines?: number): FormattedDiff;
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