| designSize | Size | Size(360,690) | The size of the device screen in the design draft, in dp |
| builder | Function | null | Return widget that uses the library in a property (ex: MaterialApp's theme) |
| child | Widget | null | A part of builder that its dependencies/properties don't use the library |
| rebuildFactor | Function | *default* | Function that take old and new screen metrics and returns whether to rebuild or not when changes. |
| splitScreenMode | bool | false | support for split screen |
| minTextAdapt | bool | false | Whether to adapt the text according to the minimum of width and height |
| context | BuildContext | null | Get physical device data if not provided, by MediaQuery.of(context) |
| fontSizeResolver | Function | *default* | Function that specify how font size should be adapted. Default is that font size scale with width of screen. |
| responsiveWidgets| Iterable<String> | null | List/Set of widget names that should be included in rebuilding tree. (See [How flutter_screenutil marks a widget needs build](#rebuild-list)) |
| designSize | Size | Size(360,690) | The size of the device screen in the design draft, in dp |
| builder | Function | null | Return widget that uses the library in a property (ex: MaterialApp's theme) |
| child | Widget | null | A part of builder that its dependencies/properties don't use the library |
| rebuildFactor | Function | _default_ | Function that take old and new screen metrics and returns whether to rebuild or not when changes. |
| splitScreenMode | bool | false | support for split screen |
| minTextAdapt | bool | false | Whether to adapt the text according to the minimum of width and height |
| context | BuildContext | null | Get physical device data if not provided, by MediaQuery.of(context) |
| fontSizeResolver | Function | _default_ | Function that specify how font size should be adapted. Default is that font size scale with width of screen. |
| responsiveWidgets | Iterable<String> | null | List/Set of widget names that should be included in rebuilding tree. (See [How flutter_screenutil marks a widget needs build](#rebuild-list)) |
| excludeWidgets | Iterable<String> | null | List/Set of widget names that should be excluded from rebuilding tree. |
**Note : You must either provide builder, child or both.**