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import {  autoprefixer,  postcss,  postcssImport,  postcssNesting,} from "../deps/postcss.ts";import { merge } from "../core/utils/object.ts";import { concurrent } from "../core/utils/concurrent.ts";import { resolveInclude } from "../core/utils/path.ts";import { Page } from "../core/file.ts";import { prepareAsset, saveAsset } from "./source_maps.ts";import textLoader from "../core/loaders/text.ts";
import type Site from "../core/site.ts";import type { SourceMap } from "./source_maps.ts";
export interface Options {  /** The list of extensions this plugin applies to */  extensions?: string[];
  /**   * Custom includes path for `postcss-import`   * @default `site.options.includes`   */  includes?: string | false;
  /**   * Plugins to use by postcss   * @default `[postcssNesting(), autoprefixer()]`   */  plugins?: unknown[];
  /** Set `false` to remove the default plugins */  useDefaultPlugins?: boolean;
  /** The name of the helper */  name?: string;}
// Default optionsexport const defaults: Options = {  extensions: [".css"],  useDefaultPlugins: true,  name: "postcss",};
const defaultPlugins = [  postcssNesting(),  autoprefixer(),];
/** A plugin to load all CSS files and process them using PostCSS */export default function (userOptions?: Options) {  return (site: Site) => {    const options = merge<Options>(      { ...defaults, includes: site.options.includes },      userOptions,    );
    const plugins = [...options.plugins ?? []];
    if (options.useDefaultPlugins) {      plugins.unshift(...defaultPlugins);    }
    if (options.includes) {      plugins.unshift(configureImport(site, options.includes));      site.ignore(options.includes);    }
    // @ts-ignore: Argument of type 'unknown[]' is not assignable to parameter of type 'AcceptedPlugin[]'.    const runner = postcss(plugins);
    site.hooks.addPostcssPlugin = (plugin) => {      runner.use(plugin);    };    site.hooks.postcss = (callback) => callback(runner);
    site.loadAssets(options.extensions);    site.process(options.extensions, (pages) => concurrent(pages, postCss));    site.filter(options.name, filter, true);
    async function postCss(file: Page) {      const { content, filename, sourceMap, enableSourceMap } = prepareAsset(        site,        file,      );      const to = site.dest(file.outputPath);      const map = enableSourceMap        ? {          inline: false,          prev: sourceMap,          annotation: false,        }        : undefined;
      // Process the code with PostCSS      const result = await runner.process(content, { from: filename, to, map });
      saveAsset(        site,        file,        result.css,        result.map?.toJSON() as unknown as SourceMap,      );    }
    async function filter(code: string): Promise<string> {      const result = await runner.process(code, { from: undefined });      return result.css;    }  };}
/** * Function to configure the postcssImport * using the Lume reader and the includes loader */function configureImport(site: Site, includes: string) {  return postcssImport({    /** Resolve the import path */    resolve(id: string, basedir: string) {      return resolveInclude(id, includes, basedir);    },
    /** Load the content (using the Lume reader) */    async load(file: string) {      const content = await site.getContent(file, textLoader);      if (content === undefined) {        throw new Error(`File ${file} not found`);      }      return content;    },  });}
/** Extends Helpers interface */declare global {  namespace Lume {    export interface Helpers {      /** @see https://lume.land/plugins/postcss/ */      postcss: (code: string) => Promise<string>;    }  }}