An object that represents a tree of fields in a form. This includes both primitive value fields
(e.g. fields that contain a string or number), as well as "grouping fields" that contain
sub-fields. FieldTree objects are arranged in a tree whose structure mimics the structure of
the underlying data. For example a FieldTree<{x: number}> has a property x which contains a
FieldTree<number>. To access the state associated with a field, call it as a function.
API
type FieldTree<TModel, TKey extends string | number = string | number, TMode extends 'writable' | 'readonly' = 'writable'> = (() => [TModel] extends [AbstractControl] ? CompatFieldState<TModel, TKey, TMode> : FieldStateByMode<TModel, TKey, TMode>) & // Children: (TModel extends AbstractControl ? object : TModel extends ReadonlyArray<infer U> ? ReadonlyArrayLike<MaybeFieldTree<U, number, TMode>> : TModel extends Record<string, any> ? Subfields<TModel, TMode> : object)
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