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# Prool setup: local Tempo test environment

Set up pooled Tempo node instances in TypeScript using [`prool`](https://github.com/wevm/prool) by following the steps below.

::::steps
## Install Prool for Tempo

:::code-group
```bash [npm]
npm i prool
```

```bash [pnpm]
pnpm i prool
```

```bash [bun]
bun i prool
```
:::

Install the [Tempo CLI](https://tempo.xyz/developers/docs/cli) and ensure `tempo` is on your `PATH`. Prool starts that binary; installing the JavaScript package alone does not install a node. Each pooled instance consumes local CPU, memory, and disk space.

## Create a Prool instance

You can programmatically start a Tempo node instance in TypeScript using `Instance.tempo`:

```ts
import { Instance, Server } from 'prool'

const server = Server.create({
  instance: Instance.tempo(),
});

// Start the node
await server.start()
// Instances available at: 
// - http://localhost:8545/1
// - http://localhost:8545/2
// - http://localhost:8545/3
// - http://localhost:8545/4
// - http://localhost:8545/n
```

:::tip
You can also set up the Tempo instance using `Instance.tempo` directly if you
do not need pooling.

```ts
import { Instance } from 'prool';

const instance = Instance.tempo()

// Start the node
await instance.start()
// Instance available at: http://localhost:8545
```
:::

## Next steps for Prool

After you have set up Tempo with Prool, you can now:

* Easily use Tempo in your test suite with Vitest
* Run Tempo locally alongside your Vite or Next.js development server
::::