rivo/Ary/Show.d.ts

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import type { Ary, AryL } from ".";
import type { Args, Fn } from "../HKT";
import type { List } from "../List";
import type { Show, TypeClass$$Show } from "../typeclass";
import type { Show as Show_ } from "../typeclass/Show/Show";

declare module "../typeclass/Show" {
  interface ShowImpl {
    array: ImplShowFor<AryL<ShowL>, Ary$$Show>;
  }
}

/**
 * Implementation of the {@link Show} type class for {@link Ary} (i.e., `Array` and `ReadonlyArray`).
 */
export interface Ary$$Show extends TypeClass$$Show<Ary<Show>> {
  Show: Ary$$Show$ShowFn;
}

/**
 * [Fn] Show an {@link Ary} (i.e., `Array` or `ReadonlyArray`).
 */
interface Ary$$Show$ShowFn extends Fn<[Ary<Show>], string> {
  // @ts-ignore - Return type annotation circularly references itself.
  def: ([xs]: Args<this>) => Ary$$Show$Show<typeof xs>;
}

/**
 * Show an {@link Ary} (i.e., `Array` or `ReadonlyArray`).
 */
type Ary$$Show$Show<TS extends Ary<Show>> =
  [TS] extends [unknown[]] ?
    number extends TS["length"] ?
      // @ts-ignore - Type instantiation is excessively deep and possibly infinite.
      `Array<${Show_<TS[number]>}>`
    : `[${ShowTuple<TS>}]`
  : number extends TS["length"] ? `ReadonlyArray<${Show_<TS[number]>}>`
  : `readonly [${ShowTuple<TS>}]`;

type ShowW<S> = [S] extends [Show] ? Show_<S> : never;

type ShowTuple<TS extends List<Show>> =
  [TS] extends [readonly [infer T]] ? ShowW<T>
  : [TS] extends [readonly [infer H, ...infer T extends List<Show>]] ?
    `${ShowW<H>}, ${ShowTuple<T>}`
  : "";