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Core SDK of Harmony protocol.
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neeboo v0.1.22
Latest commit 9cfa811 Sep 16, 2019

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A Harmony's blockchain javascript library

It's a mono-repo library, not yet published to npm.

Install from npm/yarn

Note: we added a @next tag to npm package, please use the following command to install with npm/yarn

# npm
npm install @harmony-js/core@next 

# yarn
yarn add @harmony-js/core@next

# tslib may be required, we'd better install it as well
npm install tslib
yarn add tslib

Examples with tutorials


  1. @harmony-js/core
  2. @harmony-js/account
  3. @harmony-js/crypto
  4. @harmony-js/network
  5. @harmony-js/utils
  6. @harmony-js/transaction
  7. @harmony-js/contract

Hacking from source files

  1. install lerna and typescript globally (if you have these, you can skip)
yarn global add lerna && yarn global add typescript
  1. bootstrap repostory
yarn install && yarn bootstrap
  1. run watcher before editing any source file
yarn watch
  1. if you are ready to build/test/bundle, please refer to the following section:

Manually Build/bundle


yarn build


There are 2 ways bundling files.

  1. building the es5 version bundled javascript for each sub-packages, which can be run in Browser directly.

    yarn dist

    All files are exported in /dist folder

  2. build umd and esm version javascript for each sub-packages, which can be accessed by import or require

    yarn bundle

    All files are exported in packages/dist folder, use **.esm.js or **.umd.js format

E2E tests

Contantly updating now, please get back later

  1. edit .env file if you have custom setting
  2. run harmony node locally(this fork currently :
  3. wait for 1-2 mins, and run this:
yarn build && yarn test:e2e


async function crossShard() {
  //  manually set the shardingStructure
  // 手动设置 sharding
  const shardingArray = [
      shardID: 0,
      http: 'http://localhost:9500',
      ws: 'ws://localhost:9800',
      shardID: 1,
      http: 'http://localhost:9501',
      ws: 'ws://localhost:9801',

  // get shardingStructure from rpc
  // 通过api获取sharding设置
  const res = await harmony.blockchain.getShardingStructure();
  if (res.result) {
    // if we can get from network use `harmony.shardingStructures` to set the structure to all sub module
  } else {
    // or set it using local setting  
    // 否则加载本地的设置

  // each account should update it's own shard
  // 每个帐号更新自己的sharding
  await acc1.updateBalances();
  await acc2.updateBalances();

  // to get sharded address, the format goes `bech32-{shardID}`
  // 获得分片地址,返回格式为 `bech32-{shardID}`
  const from = acc1.getAddressFromShardID(0);
  const to = acc2.getAddressFromShardID(1);

  // use `getShardBalance(shardID:number)` to get balance in shardID 
  // 可以获得指定shard的余额

  // you can print the sharding map for each account
  // 打印每个帐号的sharding结构
  console.log({ acc1: acc1.shards, acc2: acc2.shards });

  // now construct a ShardingTransaction, use `harmony.transactions.newTx(obj,true)`
  // because `from` and `to` here ,are sharded addresses, like `bech32-{shardID}`
  // you dont have to specify `shardID` and `toShardID`, it will handle it automatically.

  // 构建一个sharding transaction,注意,true这里需要标志好
  // 因为from,和 to已经被认定为带后缀的分片地址
  // 格式为`bech32-{shardID}`
  // 在这里不需要指定 shardID和toShardID了,因为这个txn会自动把 shardID和toShardID填进去
  const txn = harmony.transactions.newTx(
      value: '10000',
      gasLimit: '210000',
      gasPrice: new harmony.utils.Unit('1000000000').asWei().toWei(),

  // now use acc1 to sign, it will use specific shardID to get the nonce of sharded address
  // 正常使用acc1进行签名,这里会自动根据shardID来取指定分片的nonce
  const signed = await acc1.signTransaction(txn, true);

  // send the transaction, it will also use speicific shardID to send the transaction
  // 发送交易,同样会根据shardID来进行交易的发送
  const [sent, id] = await signed.sendTransaction();

   // print the id(transactionHash), and the class that return as well
  // 打印返回的Transaction Class,和transaction ID
  console.log({ sent, id });

  // you can use Transaction.confirm() to confirm the transaction is on the blockchain or not
  await sent.confirm(id);

  // of course you can use blockchain.getTransactionReceipt to get the receipt
  // you have to specify the shardID here.
  // 同样可以通过blockchain类来获取transaction Receipt
  // 注意你需要指定shardID

  const receipt = await harmony.blockchain.getTransactionReceipt({
    txnHash: id,
    shardID: sent.txParams.shardID,

  console.log({ receipt: receipt.result });
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