make a folder and put these 2 files. then `npm install`, `node test.js`.

package.json

{
  "dependencies": {
    "hyperdown": "github:benzmuircroft/hyperdown"
  }
}

test.js

;(async function() {

  const Keychain = (await import('keypear')).default;

  const sk = new Keychain().get();

  const server = await require('hyperdown')({
    uniqueKeyPair:          sk,
    folderName:             'topic',
    testFolder:             'server',
    isServer:               true,
    onClientConsumedEvents:
    function(remotePublicKey, eventsArray) {
      // do something ...
      // console.log('server: client used the event', remotePublicKey, eventsArray);
    }
  });

  const ck = new Keychain().get();

  const client = await require('hyperdown')({
    uniqueKeyPair:          ck,
    folderName:             'topic',
    testFolder:             'client',
    eventHandler:
    function(id, data, cb) {
      // do something ...
      // console.log('client: event from server', id, data, cb);
      // cb(id, true);
    }
  });

  // await server.addEvent(ck.publicKey, JSON.stringify({ prize: 500, game: 'robots' })); // give a client an event

  await server.put('server', 'h');
  await client.put('client', 'a');

  await server.get('client');
  await client.get('server');

})();