Option to prevent file generation if images are same

[Vlasterx]

Is it possible to implement option which will prevent file generation when images are the same?

Something like generateOnlyIfDifferent:

{
  actualFilename: string;
  expectedFilename: string;
  diffFilename?: string;
  generateOnlyIfDifferent?: boolean; // default true
  generateOnlyDiffFile?: boolean; // default false
  options?: {
    threshold?: number;   // default 0.1
    includeAA?: boolean;  // default false
  }
}