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import { merge } from "../core/utils/object.ts";
import type Site from "../core/site.ts";import type { Extensions } from "../core/utils/path.ts";import type { Page } from "../core/file.ts";
export interface Options {  /** The list of extensions this plugin applies to */  extensions?: Extensions;
  /**   * The function to test the page   * @default `(page) => true`   */  fn: (page: Page) => boolean;}
// Default optionsexport const defaults: Options = {  extensions: "*",  fn: () => true,};
/** A plugin to filter only some pages */export default function (userOptions: Options) {  const options = merge(defaults, userOptions);
  return (site: Site) => {    site.process(options.extensions, (pages, allPages) => {      for (const page of pages) {        if (!options.fn(page)) {          allPages.splice(allPages.indexOf(page), 1);        }      }    });  };}