The _fields property in the IDocumentListItem interface is used to define the fields of a
document list item. It is an object that contains key-value pairs, where the key is the field name
and the value is an object that describes the field.
The name:string; is defining a property called name in the IGridListProps interface. This
property is of type string, which means it can hold a string value. It represents the name of a
grid list.
The relativePath:string; property in the IDocumentListItem interface is used to store the
relative path of a document list item. It represents the path of the item relative to the root
folder of the document library.
The type:'file'|'folder'; is defining a property called type in the IDocumentListItem
interface. This property can have two possible values: 'file' or 'folder'. It is used to
indicate whether the item in the document list is a file or a folder.
The
_content:string;property in theIDocumentListIteminterface is used to store the content of a document list item. It represents the actual content of the item, such as the text of a document or the data in a file. The property is of typestring, which means it can hold a string value.