# File Diff · Pro

A code diff computed in the browser: added and removed lines with gutters, unchanged stretches folded away, unified or split view, and accept and reject buttons for agent-proposed edits.

This is a Charcoal UI Pro component. Its source and examples are available with a Pro seat: https://charcoalui.com/pricing

## With a Pro seat

1. Add the registry to components.json:

```json
{
  "registries": {
    "@charcoal": {
      "url": "https://charcoalui.com/r/{name}.json",
      "headers": {
        "Authorization": "Bearer ${CHARCOAL_LICENSE_KEY}"
      }
    }
  }
}
```

2. Copy your licence key from https://charcoalui.com/dashboard and put it in .env.local as CHARCOAL_LICENSE_KEY, then:

```bash
npx shadcn@latest add @charcoal/file-diff
```

To read Pro source through this MCP server, reconnect it with the header "Authorization: Bearer <licence key>".

## API — File Diff
| Prop | Type | Default | Notes |
| --- | --- | --- | --- |
| `filename` | `string` | — |  |
| `before / after` | `string` | — |  |
| `context` | `number` | `2` |  |
| `view` | `"unified" \| "split"` | `"unified"` |  |
| `review` | `boolean` | `false` |  |
| `onAccept / onReject` | `() => void` | — |  |

See it live: https://charcoalui.com/docs/components/file-diff