To start off, let's address the generic constraint on FormFields<T>, which should be modified from
T extends Record<keyof T, Arg | Array<FormFieldsRecursive<T>>>The particular version mentioned is not effective because FormFieldsRecursive<T> actually represents the output of your type transformation. If there's a need to name the input, it can be described like so:
type ArgsObj = { [k: string]: Arg | ReadonlyArray<ArgsObj> };
This implies that an ArgsObj includes a string index signature disregarding its keys. The properties are either Arg or an array consisting of ArgsObj elements. It's worth noting that using a read-only array is essential when employing const assertions, since regular arrays are subtypes of read-only arrays.
In implementing
type FormFields<T extends ArgsObj>ArgsObj are permitted.
However, complicating things further with this constraint might not be necessary. Constraints can be applied at specific functions where ensuring a type adheres to the ArgsObj structure is crucial.
So, how can we recursively write FormFields<T>? I find breaking down the process into two type entities to be the most straightforward approach. One type, FormFields<T>, traverses the entire object type, while FormField<T> focuses on mapping a single property within that object. Essentially, it can be defined as follows:
type FormFields<T> = {
[K in keyof T]: FormField<T[K]>
}
type FormField<T> =
T extends Arg ? Field<T> : { [I in keyof T]: FormFields<T[I]> };
In summary, FormFields<T> acts as a mapped type that assigns each property of T with FormField<>. On the other hand, FormField<T> serves as a conditional type to check if the property aligns with an Arg. If affirmative, Field<T> applies accordingly. Conversely, for array types holding data suitable for FormFields<>, a mechanism allowing map array/tuple operations based on indexed annotation support is utilized.
A sample test confirms the functionality:
const exampleArgsObjectRecursive = {
// Sample structured data
} as const;
type GeneratedRecursiveExampleFieldsType = FormFields<typeof exampleArgsObjectRecursive>;
/* Expected type results */
After reviewing the laid out details above and realizing the formatting could pose challenges in interpreting the complete type scope, revising the approach through additional infer steps enhances clarity. By incorporating extra logic involving inferring mapped types, the final outcome reveals the detailed schema you aim to achieve.
For comprehensive visualization and perfect encapsulation of all type definitions, playing around with playground simulations could offer insightful outcomes.
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