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import { Data, Engine, Helper, Site } from "../core.ts";import loader from "../core/loaders/module.ts";import { merge } from "../core/utils.ts";
export interface Options {  /** The list of extensions used to load data */  dataExtensions: string[];
  /** The list of extensions used to load pages */  pagesExtensions: string[];}
// Default optionsconst defaults: Options = {  dataExtensions: [".js", ".ts"],  pagesExtensions: [".tmpl.js", ".tmpl.ts"],};
/** Template engine to render js/ts files */export class ModuleEngine implements Engine {  helpers: Record<string, Helper> = {};
  async render(content: unknown, data: Data): Promise<unknown> {    return typeof content === "function"      ? await content(data, this.helpers)      : content;  }
  addHelper(name: string, fn: Helper) {    this.helpers[name] = fn;  }}
/** Register the plugin to load JavaScript/TypeScript modules */export default function (userOptions?: Partial<Options>) {  const options = merge(defaults, userOptions);
  return (site: Site) => {    site.loadPages(options.pagesExtensions, loader, new ModuleEngine());    site.loadData(options.dataExtensions, loader);  };}