FieldTree
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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https://angular.dev/api/forms/signals/FieldTree
