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mapTreeItem
Creates a new array with the results of calling the provided callback function
on the element which match the level in the provided data tree.
Parameters
tree
any[]
The data tree.
level
number[]
An array of indexes of each parent and current item in the data tree.
subItemsField
string
The field which points to the subitems collection of each data item.
callback
(value: any) => any
The callback function.