config/configs library
Classes
- BlockConfig
 - ContainerConfig
 - InlineConfig
 - LeafConfig
 - MarkdownConfig
 - use MarkdownConfig to set various configurations for MarkdownWidget
 - WidgetConfig
 
Enums
- MarkdownTag
 - 
  the tags of markdown, see 
https://spec.commonmark.org/0.30/ 
Typedefs
- 
    ValueCallback<
T> = void Function(T value)