File: EnvironmentVariables.md

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---
id: environment-variables
title: Environment Variables
---

Jest sets the following environment variables:

### `NODE_ENV`

Set to `'test'` if it's not already set to something else.

### `JEST_WORKER_ID`

Each worker process is assigned a unique id (index-based that starts with `1`). This is set to `1` for all tests when [`runInBand`](CLI.md#--runinband) is set to true.