ethers-multisend

An npm package for crafting multi-send transaction from a Safe, based on ethers.js v5.

Features

• Easily encode the most common types of transactions from JSON inputs:
  • ETH & ERC20 token transfers
  • NFT transfers
  • Contract function calls
  • Raw transactions
• Encode a batch of transactions into a single multi-send call.

What to do with the encoded transaction objects?

The encode functions produce JavaScript objects that can be used to actually execute the described transactions. There are various ways to do that, using direct calls to your Safe contract, or by relaying it using the infrastructure provided by Safe. Check out the Safe{Core} SDK to learn more: https://github.com/safe-global/safe-core-sdk

Installation

This module is distributed via npm. For adding it to your project, run:

npm install --save ethers-multisend

To install it using yarn, run:

yarn add ethers-multisend

API

encodeSingle

encodeSingle(transactionInput: TransactionInput): MetaTransaction

Encodes a single transaction input and turns into an format that is ready for execution.

encodeMulti

encodeMulti(
  metaTransaction: MetaTransaction[],
  multiSendContractAddress?: string
): MetaTransaction

Batches a set of meta transactions into a single multi-send contract call.

You can optionally provide the multiSendContractAddress to use. By default, it will use MultiSendCallOnly v1.4.1 or MultiSend v1.4.1 if the batch includes any delegate calls.

decodeSingle

decodeSingle(
  metaTransaction: MetaTransaction,
  provider: Provider,
  fetchAbi?: (address: string) => Promise<string | undefined>,
  id?: string
): Promise<TransactionInput>

Decodes a meta transaction and returns a transaction input object of one of the four supported types. It needs an ethers provider instance to fetch decimals for ERC20 token transfers, and a function for fetching the ABI for a contract address.

decodeMulti

decodeMulti(data: string): MetaTransaction[]

Given the data string of a multi-send transaction, returns an array of the included meta transactions.

createTransaction

createTransaction(type: TransactionType, id?: string): TransactionInput

Creates an empty transaction input of the specified type.

isValid

isValid(transactionInput: TransactionInput): boolean

Returns whether the provided transaction input can be encoded into a meta transaction without errors and has a valid to address.

Types

The TransactionInput type captures the information for any of the four supported transaction types.

type TransactionInput =
  | CallContractTransactionInput
  | TransferFundsTransactionInput
  | TransferCollectibleTransactionInput
  | RawTransactionInput

The library's encoding functions return objects of the MetaTransaction type, which is a format with an ABI encoded data field so it is ready for execution.

interface MetaTransaction {
  readonly to: string
  readonly value: string
  readonly data: string
  readonly operation?: OperationType
}

Find the full information about all TypeScript types here: src/types.ts