Detox/website/versioned_docs/version-20.x/config/behavior.mdx

import Location from './partials/_location.mdx';

# Behavior

If you need to tweak the flow of `detox.init()` or `detox.cleanup()` steps,
you have a few options to change. These are the default behavior values:

## Location

<Location sectionName="behavior" />

## Default values

```json
{
  "behavior": {
    "init": {
      "reinstallApp": true,
      "exposeGlobals": true,
    },
    "launchApp": "auto",
    "cleanup": {
      "shutdownDevice": false
    }
  }
}
```

## Properties

### `behavior.init.reinstallApp` \[boolean]

Default: `true`.

When _true_, Detox will uninstall and install the app upon the initialization.

Setting it to _false_ forces the tests to use the previously installed app on the device,
provided you have installed it beforehand [explicitly](../api/device.md#deviceinstallapp) or manually.

### `behavior.init.exposeGlobals` \[boolean]

Default: `true`.

When _true_, it forces Detox to expose `device`, `expect`, `element`, `by` and `waitFor`
as global variables.

When _false_, you should import them explicitly instead:

```js
const { by, device, expect, element } = require('detox');
```

or, in TypeScript:

```js
import { by, device, expect, element } from 'detox';
```

### `behavior.launchApp` \[enum]

Default: `auto`.

Possible values: `auto`, `manual`.

When set to `manual`, Detox won't be launching your app automatically. Instead, it will
be waiting until you launch it manually from IDE and press any key to resume the test
execution. This is useful when you want to [debug the native codebase](../introduction/debugging.mdx) when running Detox tests.

Also, setting it to `manual` resets `behavior.reinstallApp` to _false_.

### `behavior.cleanup.shutdownDevice` \[boolean]

Default: `false`.

When set to _true_, Detox will shut down the device after the tests finish.