React + Aleo + Leo

This template provides a minimal setup to get React and Aleo working in Vite with HMR and some ESLint rules.

This template includes a Leo program that is loaded by the web app located in the helloworld directory.

Note: Webpack is currently used for production builds due to a bug with Vite related to nested workers.

Start in development mode

npm run dev

Your app should be running on http://localhost:5173/

Build Leo program

1. Copy the helloworld/.env.example to helloworld/.env (this will be ignored by Git):

   cd helloworld
   cp .env.example .env

2. Replace PRIVATE_KEY=user1PrivateKey in the .env with your own key (you can use an existing one or generate your own at https://aleo.tools/account)

3. Follow instructions to install Leo here: https://github.com/AleoHQ/leo

4. You can edit helloworld/src/main.leo and run leo run to compile and update the Aleo instructions under build which are loaded by the web app.

Deploy program from web app

Warning

This is for demonstration purposes or local testing only, in production applications you should avoid building a public facing web app with private key information

Information on generating a private key, seeding a wallet with funds, and finding a spendable record can be found here if you are unfamiliar: https://developer.aleo.org/testnet/getting_started/deploy_execute_demo

Aleo programs deployed require unique names, make sure to edit the program's name to something unique in helloworld/src/main.leo, helloworld/program.json, rename helloworld/inputs/helloworld.in and rebuild.

1. In the worker.js file modify the privateKey to be an account with available funds

   // Use existing account with funds
   const account = new Account({
     privateKey: "user1PrivateKey",
   });

2. (Optional) Provide a fee record manually (located in commented code within worker.js)

   If you do not provide a manual fee record, the SDK will attempt to scan for a record starting at the latest block. A simple way to speed this up would be to make a public transaction to this account right before deploying.

3. Run the web app and hit the deploy button

Production deployment

Build

npm run build

Upload dist folder to your host of choice.

⚠️ Header warnings

DOMException: Failed to execute 'postMessage' on 'Worker': SharedArrayBuffer transfer requires self.crossOriginIsolated

If you get a warning similar to this when deploying your application, you need to make sure your web server is configured with the following headers:

Cross-Origin-Opener-Policy: same-origin
Cross-Origin-Embedder-Policy: require-corp

We've included a _headers file that works with some web hosts (e.g. Netlify) but depending on your host / server setup you may need to configure the headers manually.