import { CommonKeys } from "."


// type ExtendReducer<Super, Self> = (
//     Pick<Self, CommonKeys<Self, Super>> extends Pick<Super, CommonKeys<Self, Super>>
//         ? Omit<Super, CommonKeys<Self, Super>> & Self
//         : never
// )
// interface ExtendReducerFn extends Fn {
//     return: ExtendReducer<this["arg0"], this["arg1"]>
// }
// export type ExtendFn = Tuples.Reduce<ExtendReducerFn, {}>


export type Extend<T extends readonly object[]> = (
    T extends [infer Super, infer Self, ...infer Rest]
        ? Rest extends object[]
            ? Pick<Self, CommonKeys<Self, Super>> extends Pick<Super, CommonKeys<Self, Super>>
                ? Extend<[
                    Omit<Super, CommonKeys<Self, Super>> & Self,
                    ...Rest,
                ]>
                : never
            : never
        : T extends [infer Self]
            ? Self extends object
                ? Self
                : never
            : {}
)


// export type ExtendableFn = ComposeLeft<[
//     ExtendFn,
//     Match<[
//         Match.With<never, false>,
//         Match.With<any, true>,
//     ]>
// ]>