Subspace 2.0

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Introducing Subspace React’s components

A new set of components were created to simplify the usage of Subspace within React projects. Learn more about them here


You can install it through npm or yarn:

npm install --save @embarklabs/subspace-react web3 rxjs



To use most of the subspace-react components, you need to wrap your app with the <SubspaceProvider web3={web3} /> component. This will make Subspace available to any nested components that accesses it via the useSubspace hook or has been wrapped in the withSubspace higher order component. Any React component might use Subspace so it makes sense to add the provider near the top level of your DApp. The SubspaceProvider requires a web3 object to interact with an Ethereum node.

// index.js
import React from 'react'
import ReactDOM from 'react-dom'
import MyApp from './MyApp'
import { SubspaceProvider } from '@embarklabs/subspace-react';

const web3 = new Web3("ws://localhost:8545");

const rootElement = document.getElementById('root')
<SubspaceProvider web3={web3}>
<MyApp />


Rather than relying on global variables or passing Subspace through props, the easiest way to access Subspace features is via the useSubspace hook. Be sure that your entire DApp is wrapped with a <SubspaceProvider /> to have it available throughout the component tree.

// index.js
import React from 'react'
import { useSubspace } from '@embarklabs/subspace-react';

const MyComponent = () => {
const subspace = useSubspace();

// do something....
// subspace.trackBalance(web3.eth.defaultAccount);

return ...;

export default MyComponent


This higher order component is provided as an alternative to the useSubspace hook. This injects the subspace property with an already initialized Subspace instance. Just like with the hook, your entire DApp needs to be wrapped with a <SubspaceProvider />.

// index.js
import React from 'react'
import { withSubspace } from '@embarklabs/subspace-react';

const MyComponent = (props) => {
// do something....
// props.subspace.trackBalance(web3.eth.defaultAccount);

return ...;

export default withSubspace(MyComponent);


This function is useful to make your component subscribe to any observable props it receives when the component is mounted and automatically unsubscribes when the component is unmounted. It can be used with any kind of observables. This component already existed in the previous version of Subspace. The only difference is that it has been moved to the subspace-react package.

import { observe } from '@embarklabs/subspace-react';

const ObserverComponent = observe(WrappedComponent);
Example usage:
const MyComponent = ({eventData}) =>  {
// Handle initial state when no data is available
if (!eventData) {
return <p>No data</p>;

return <p>Value: {eventData.someReturnValue}</p>

const MyEnhancedComponent = observe(MyComponent);

const SomeOtherComponent = () => {
const myObservable$ ={fromBlock: 1});
return <MyEnhancedComponent myProp={myObservable$} />;

Breaking changes

Maintenance / Bug fixes


Subspace and the entire Embark labs organization are open source. As such, we welcome contributions and input from the community using the product.

If you’d like to contribute to Subspace, please fork this repository, fix, commit and send a pull request for the maintainers to review and merge into the main code base. If you wish to submit more complex changes though, please check up with the core devs first on #embark-status channel to ensure those changes are in line with the general philosophy of the project and/or get some early feedback which can make both your efforts much lighter as well as our review and merge procedures quick and simple.