Duplicitous hypercores

Duplicitous-hypercores.js

const Hypercore = require('hypercore');
const ram = require('random-access-memory');
const crypto = require('hypercore-crypto');

(async () => {
  const keyPair = crypto.keyPair();
  const a = new Hypercore(ram, { keyPair });
  const b = new Hypercore(ram, a.key, { keyPair: keyPair });

  await a.append(['a1', 'a2']);
  await b.append(['a1', 'b2', 'b3']);

  const c = new Hypercore(ram, a.key);
  await c.ready();

  console.log(a.key === b.key && a.key === c.key); // true
  console.log((await a.get(1)).toString()); // a2
  console.log((await b.get(1)).toString()); // b2

  const replicate = (x, y) => {
    const s1 = x.replicate(true, { keepAlive: false });
    const s2 = y.replicate(false, { keepAlive: false });
    s1.pipe(s2).pipe(s1);
  };

  replicate(a, c);
  replicate(b, c);

  const cLast = (await c.get(1)).toString();

  // {cLast: 'a2'} unless replicate(a,c) is commented out
  console.log({ cLast });
})();