function createMutexByKey<K>(
  options?: CreateMutexByKeyOptions<K, unknown>,
): MutexByKey<K>;

import {
  assertOk,
  assertTrue,
  createMutexByKey,
  createRun,
  ok,
  type Task,
} from "@evolu/common";

const accountLocks = createMutexByKey<string>();
const balancesByAccount = new Map<string, number>();
const deposit = (account: string, amount: number): Task<number> =>
  accountLocks.withLock(account, () => {
    const balance = (balancesByAccount.get(account) ?? 0) + amount;
    balancesByAccount.set(account, balance);
    return ok(balance);
  });

await using run = createRun();
assertOk(await run(deposit("checking", 2)), 2);
assertOk(await run(deposit("checking", 3)), 5);
assertTrue(accountLocks.isIdle("checking"));

function createMutexByKey<K, L>(
  options: CreateMutexByKeyOptions<K, L>,
): MutexByKey<K>;