import * as Diff from 'diff';
declare type MinimizeDiff = string | number;
declare type Change = Diff.Change;
declare class Undo {
    undos: MinimizeDiff[][];
    redos: MinimizeDiff[][];
    constructor();
    recordDiff(oldChars: string, newChars: string): Diff.Change[];
    minimizeDiffInfo(diffInfo: Change[]): MinimizeDiff[];
    undo(chars: string): string;
    redo(chars: string): string;
    merge(oldChars: string, diffInfo: MinimizeDiff[]): string;
    unmerge(oldChars: string, diffInfo: MinimizeDiff[]): string;
}
declare const _default: Undo;
export default _default;