DiffResult

interface DiffResult {
  before: readonly string[];
  after: readonly string[];
  rows: readonly DiffRow[];
  changes: readonly DiffChange[];
  stats: DiffStats;
  complete: boolean;
  format?: { before: DiffFormat; after: DiffFormat };
}

interface DiffFormat {
  ending: 'lf' | 'crlf' | 'cr' | 'mixed' | 'none';
  finalNewline: boolean;
  byteOrderMark: boolean;
}

class DiffResult {
  final List<String> before;
  final List<String> after;
  final List<DiffRow> rows;
  final List<DiffChange> changes;
  final DiffStats stats;
  final bool complete;
  final DiffDocumentFormat? format;
}

class DiffDocumentFormat {
  final DiffFormat before;
  final DiffFormat after;
}

class DiffFormat {
  final DiffLineEnding ending;
  final bool finalNewline;
  final bool byteOrderMark;
}

DiffLineEnding is lf, crlf, cr, mixed or none.

format is how each document is written rather than what is in it, and it is left out where nobody could know it — a comparison read back out of a patch never saw either file.