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import { format, loadLanguages } from "../deps/date.ts";import { merge } from "../core/utils.ts";
import type { Helper, Site } from "../core.ts";
const formats = new Map([  ["ATOM", "yyyy-MM-dd'T'HH:mm:ssXXX"],  ["DATE", "yyyy-MM-dd"],  ["DATETIME", "yyyy-MM-dd HH:mm:ss"],  ["TIME", "HH:mm:ss"],  ["HUMAN_DATE", "PPP"],  ["HUMAN_DATETIME", "PPPppp"],]);
export interface Options {  /** The name of the helper */  name: string;
  /** The loaded locales */  locales: Record<string, unknown> | string[];
  /** Custom date formats */  formats: Record<string, string>;}
// Default optionsexport const defaults: Options = {  name: "date",  locales: {},  formats: {},};
/** A plugin to format Date values */export default function (userOptions?: Partial<Options>) {  const options = merge(defaults, userOptions);
  return (site: Site) => {    site.addEventListener("beforeBuild", async () => {      const locales = Array.isArray(options.locales)        ? await loadLanguages(options.locales)        : options.locales;
      const defaultLocale = Object.keys(locales).shift();
      site.filter(options.name, filter as Helper);
      function filter(        date: string | Date,        pattern = "DATE",        lang = defaultLocale,      ) {        if (!date) {          return;        }
        if (date === "now") {          date = new Date();        } else if (!(date instanceof Date)) {          date = new Date(date);        }
        const patt = options.formats[pattern] || formats.get(pattern) ||          pattern;        const locale = lang ? locales[lang] : undefined;
        return format(date, patt, { locale });      }    });  };}