Provides the `FormFile` class, a custom Pydantic annotation that validates file uploads (size, content type, extension) and integrates with FastAPI's dependency injection. Also includes `fastui_form` to convert form data into Pydantic models. The `unflatten` function efficiently reconstructs nested dicts from flat form data. This module is a self-contained, reusable pattern for file validation and form handling in FastAPI.

Implements a complete GitHub OAuth authentication provider with state management via JWT, caching of access token exchanges, and methods to fetch user info and emails. The `GitHubAuthProvider` class is fully self-contained, requiring only an httpx client and credentials. It can be reused in any FastAPI (or similar) application with minimal adaptation.

Converts Pydantic model JSON schemas into a list of form field components (FormFieldInput, FormFieldSelect, etc.). Handles nested models, tuples, enums, file uploads, and textareas. The logic is complex but well-encapsulated; the `model_json_schema_to_fields` function is the main entry point. This module is the core of the `ModelForm` component and could be extracted to auto-generate forms from any Pydantic model.

Provides a flexible class name generation system for React components. The `useClassName` hook merges backend-provided class names with generator-produced class names, supporting string, array, and object formats. The `renderClassName` utility normalizes class names. This pattern enables themeable, customizable components without tight coupling to any CSS framework. It is a standalone, reusable piece of React infrastructure.