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/** * Showable is a structure that indicates that an instance can be converted to a * string. * * @module Showable * @since 2.0.0 */
import type { Hold } from "./kind.ts";
/** * A Showable structure has the method show. * * @since 2.0.0 */export interface Showable<U> extends Hold<U> {  readonly show: (value: U) => string;}
/** * @since 2.10.0 */export function struct<A>(  shows: { [K in keyof A]: Showable<A[K]> },): Showable<{ readonly [K in keyof A]: A[K] }> {  const entries = Object.entries(shows) as [    keyof A & string,    Showable<A[keyof A]>,  ][];  return {    show: (struct) => {      const inner = entries        .map(([key, { show }]) => `${key}: ${show(struct[key])}`)        .join(", ");      return inner.length > 0 ? `{ ${inner} }` : "{}";    },  };}
/** * @since 2.10.0 */export const tuple = <A extends ReadonlyArray<unknown>>(  ...shows: { [K in keyof A]: Showable<A[K]> }): Showable<Readonly<A>> => ({  show: (tuple) => `[${tuple.map((a, i) => shows[i].show(a)).join(", ")}]`,});