DiffChange

interface DiffChange {
  kind: 'insert' | 'delete' | 'replace';
  beforeStart: number;
  beforeEnd: number;
  afterStart: number;
  afterEnd: number;
  rowStart: number;
  rowEnd: number;
}

class DiffChange {
  final DiffChangeKind kind;
  final int beforeStart;
  final int beforeEnd;
  final int afterStart;
  final int afterEnd;
  final int rowStart;
  final int rowEnd;
}

DiffChangeKind is insert, delete or replace.

Every range is half-open. Only changed runs are on the list; unchanged runs are the gaps between them.