gistfile1.txt

// `dot` is the name we gave to `npx papi add`
import { dot } from "@polkadot-api/descriptors";
import { createClient, SS58String } from "polkadot-api";
import { getSmProvider } from "polkadot-api/sm-provider";
import { chainSpec } from "polkadot-api/chains/polkadot";
import { startFromWorker } from "polkadot-api/smoldot/from-node-worker";
import { fileURLToPath } from "url";
import { dirname, join } from "path";
import { Worker } from "worker_threads";

export async function getNonce(signer: SS58String) {
  // next15 + turbopack does not support the import.meta.resolve like suggested in papi.how
  // const workerPath = fileURLToPath(
  //   import.meta.resolve("polkadot-api/smoldot/node-worker")
  // );
  const currentFilePath = fileURLToPath(import.meta.url);
  const currentDir = dirname(currentFilePath);
  const workerPath = join(
    currentDir,
    "..",
    "node_modules",
    "polkadot-api",
    "dist",
    "reexports",
    "smoldot_node-worker.js"
  );

  const worker = new Worker(workerPath);
  const smoldot = startFromWorker(worker);
  const chain = await smoldot.addChain({ chainSpec });

  // Connect to the polkadot relay chain.
  const client = createClient(getSmProvider(chain));

  // With the `client`, you can get information such as subscribing to the last
  // block to get the latest hash:
  client.finalizedBlock$.subscribe((finalizedBlock) =>
    console.log(finalizedBlock.number, finalizedBlock.hash)
  );

  // To interact with the chain, you need to get the `TypedApi`, which includes
  // all the types for every call in that chain:
  const dotApi = client.getTypedApi(dot);

  // get the account info
  const accountInfo = await dotApi.query.System.Account.getValue(signer);

  smoldot.terminate();
  return accountInfo.nonce;
}