TypeScript SDK

Installation

bun

bun add @unionlabs/client

pnpm

pnpm add @unionlabs/client

npm

npm install @unionlabs/client

yarn

yarn add @unionlabs/client

The Union Client is TypeScript-first and framework agnostic. At app.union.build we use Svelte but you can use any framework or no frameworks at all. If you’re a React developer, checkout this demo on Stackblitz.

Note

If you need testnet tokens for testing, visit https://app.union.build/faucet and do some shopping.

Client Initialization

EVM Based Client

import { privateKeyToAccount } from "viem/accounts"
import { createUnionClient, http } from "@unionlabs/client"

const client = createUnionClient({
  chainId: "80084",
  transport: http("https://bartio.rpc.berachain.com"),
  account: privateKeyToAccount(`0x${process.env.PRIVATE_KEY}`),
})

Cosmos Based Client

import {
  http,
  createUnionClient,
  hexStringToUint8Array
} from "@unionlabs/client"
import { DirectSecp256k1Wallet } from "@cosmjs/proto-signing"

const PRIVATE_KEY = process.env["PRIVATE_KEY"]
if (!PRIVATE_KEY) throw new Error("Private key not found")

const account = await DirectSecp256k1Wallet.fromKey(
  Uint8Array.from(hexStringToUint8Array(PRIVATE_KEY)),
  "stride"
)

const client = createUnionClient({
  account,
  chainId: "stride-internal-1",
  transport: http("stride.testnet-1.stridenet.co"),
})

Multi-Chain Client

import {
  http,
  hexStringToUint8Array,
  createMultiUnionClient
} from "@unionlabs/client"
import { privateKeyToAccount } from "viem/accounts"
import { DirectSecp256k1Wallet } from "@cosmjs/proto-signing"

const PRIVATE_KEY = process.env["PRIVATE_KEY"]
if (!PRIVATE_KEY) throw new Error("Private key not found")

const clients = createMultiUnionClient([
  {
    chainId: "80084",
    transport: http("https://bartio.rpc.berachain.com"),
    account: privateKeyToAccount(`0x${PRIVATE_KEY}`),
  },
  {
    chainId: "stride-internal-1",
    transport: http("stride.testnet-1.stridenet.co"),
    account: await DirectSecp256k1Wallet.fromKey(
      Uint8Array.from(hexStringToUint8Array(PRIVATE_KEY)),
      "stride"
    ),
  }
])

Transferring Assets

We will transfer 1 HONEY from Berachain bArtio to Stride Testnet.

You have the option to trigger the approval transaction manually by setting autoApprove to false then calling .approveTransaction before calling .transferAsset.

main.ts

import { unionClient } from "./client.ts"
import type { TransferAssetsParameters } from "@unionlabs/client"

const transferPayload = {
  amount: 1n,
  autoApprove: false,
  // ^ we will approve manually for this example
  destinationChainId: "stride-internal-1",
  receiver: "stride17ttpfu2xsmfxu6shl756mmxyqu33l5ljegnwps",
  denomAddress: "0x0E4aaF1351de4c0264C5c7056Ef3777b41BD8e03",
  // ^ HONEY contract address
} satisfies TransferAssetsParameters<"80084">

const approval = await unionClient.approveTransaction(transferPayload)

if (approval.isErr()) {
  console.error(approval.error)
  process.exit(1)
}

console.info(`Approval hash: ${approval.value}`)

const transfer = await unionClient.transferAsset(transferPayload)

if (transfer.isErr()) {
  console.error(transfer.error)
  process.exit(1)
}

console.info(`Transfer hash: ${transfer.value}`)

client.ts

import { privateKeyToAccount } from "viem/accounts"
import { createUnionClient, http } from "@unionlabs/client"

let PRIVATE_KEY = process.env["PRIVATE_KEY"]
if (!PRIVATE_KEY) throw new Error("PRIVATE_KEY is not set")
PRIVATE_KEY = PRIVATE_KEY.startsWith("0x") ? PRIVATE_KEY : `0x${PRIVATE_KEY}`

export const unionClient = createUnionClient({
  chainId: "80084",
  account: privateKeyToAccount(PRIVATE_KEY),
  transport: http("https://bartio.rpc.berachain.com")
})

Run the above example

bun

PRIVATE_KEY="" bun x tsx main.ts

pnpm

PRIVATE_KEY="" pnpm dlx tsx main.ts

npm

PRIVATE_KEY="" npm x tsx main.ts

yarn

PRIVATE_KEY="" yarn dlx tsx main.ts