Why extend from eventEmitter when the methods are never used (hexo-cli)?

Question

Why have class Context extend EventEmitter at all ? in the package hexoc-cli i don't see the methods of EventEmitter used at all, so why extend from this class ?

I see context is defined HERE like so :-

class Context extends EventEmitter { // code here } 

and then ofcourse being used in the index(hexo.ts) file like so LINK :-

function entry(cwd = process.cwd(), args) {
  args = camelCaseKeys(
      args || minimist(process.argv.slice(2), 
      { string: ['_', 'p', 'path', 's' ,'slug'] 
  }));

  let hexo = new Context(cwd, args);
  // more code here
}