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# Accessing ProseMirror internals

The ProseMirror internals are packaged in the `@tiptap/pm` package that you need to install with `npm install @tiptap/pm`. If you already have this done you can skip the following step.

```bash
npm i @tiptap/pm
```

After that you can access all internal ProseMirror packages like this:

```js
// this example loads the EditorState class from the ProseMirror state package
import { EditorState } from '@tiptap/pm/state'
```

The following packages are available:

- `@tiptap/pm/changeset`
- `@tiptap/pm/collab`
- `@tiptap/pm/commands`
- `@tiptap/pm/dropcursor`
- `@tiptap/pm/gapcursor`
- `@tiptap/pm/history`
- `@tiptap/pm/inputrules`
- `@tiptap/pm/keymap`
- `@tiptap/pm/markdown`
- `@tiptap/pm/menu`
- `@tiptap/pm/model`
- `@tiptap/pm/schema-basic`
- `@tiptap/pm/schema-list`
- `@tiptap/pm/state`
- `@tiptap/pm/tables`
- `@tiptap/pm/trailing-node`
- `@tiptap/pm/transform`
- `@tiptap/pm/view`