Demo syntax doesn't work in typescript

[Cryptok777]

https://github.com/kaspanet/rusty-kaspa/blob/f674ad5e071f79d294c6964ee114e8feea9d29ff/wasm/nodejs/generator.js#L81

The following should work:

let pending
while ((pending = await generator.next())) {
  await pending.sign([privateKey])
  let txid = await pending.submit(rpc)
  console.log("txid:", txid)
}