This is a sub-package of web3.js.
This Eth package is used within some web3.js packages.
Please read the documentation for more.
You can install the package either using NPM or using Yarn
npm install web3-eth
yarn add web3-eth
const Web3Eth = require('web3-eth');
const eth = new Web3Eth('ws://localhost:8546');
All the TypeScript typings are placed in the types
folder.