buidler-ethers
Buidler plugin for integration with ethers.js.
What
This plugin brings to Buidler the Ethereum library ethers.js
, which allows you to interact with the Ethereum blockchain in a simple way.
Installation
npm install --save-dev @nomiclabs/buidler-ethers 'ethers@^5.0.0'
And add the following statement to your buidler.config.js
:
usePlugin("@nomiclabs/buidler-ethers");
Tasks
This plugin creates no additional tasks.
Environment extensions
This plugins adds an ethers
object to the Buidler Runtime Environment.
This object has the same API than ethers.js
, with some extra Buidler-specific
functionality.
Provider object
A provider
field is added to ethers
, which is an ethers.providers.Provider
automatically connected to the selected network.
Helpers
These helpers are added to the ethers
object:
function getContractFactory(name: string, signer?: ethers.Signer): Promise<ethers.ContractFactory>;
function getContractAt(nameOrAbi: string | any[], address: string, signer?: ethers.Signer): Promise<ethers.Contract>;
function getSigners() => Promise<ethers.Signer[]>;
The Contract
s and ContractFactory
s returned by these helpers are connected to the first signer returned by getSigners
be default.
Usage
There are no additional steps you need to take for this plugin to work.
Install it and access ethers through the Buidler Runtime Environment anywhere you need it (tasks, scripts, tests, etc). For example, in your buidler.config.js
:
usePlugin("@nomiclabs/buidler-ethers");
// task action function receives the Buidler Runtime Environment as second argument
task(
"blockNumber",
"Prints the current block number",
async (_, { ethers }) => {
await ethers.provider.getBlockNumber().then((blockNumber) => {
console.log("Current block number: " + blockNumber);
});
}
);
module.exports = {};
And then run npx buidler blockNumber
to try it.
Read the documentation on the Buidler Runtime Environment to learn how to access the BRE in different ways to use ethers.js from anywhere the BRE is accessible.
TypeScript support
You need to add this to your tsconfig.json
's files
array: "node_modules/@nomiclabs/buidler-ethers/src/type-extensions.d.ts"