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import { minify } from "../deps/terser.ts";import { merge } from "../core/utils/object.ts";import { Page } from "../core/file.ts";import { prepareAsset, saveAsset } from "./source_maps.ts";
import type Site from "../core/site.ts";import type { MinifyOptions } from "../deps/terser.ts";
export interface Options {  /** The list of extensions this plugin applies to */  extensions?: string[];
  /**   * Options passed to `terser`   * @see https://terser.org/docs/api-reference/#minify-options   */  options?: MinifyOptions;}
// Default optionsexport const defaults: Options = {  extensions: [".js"],  options: {    module: true,    compress: true,    mangle: true,  },};
/** A plugin to load all JavaScript files and minify them using Terser */export default function (userOptions?: Options) {  const options = merge(defaults, userOptions);
  return (site: Site) => {    site.loadAssets(options.extensions);    site.process(options.extensions, (pages) => pages.forEach(terser));    site.filter("terser", filter, true);
    async function terser(page: Page) {      const { content, filename, sourceMap, enableSourceMap } = prepareAsset(        site,        page,      );
      const terserOptions = {        ...options.options,        sourceMap: enableSourceMap          ? {            content: JSON.stringify(sourceMap),            filename: filename,          }          : undefined,      };
      try {        const output = await minify({ [filename]: content }, terserOptions);        saveAsset(          site,          page,          output.code!,          // @ts-expect-error: terser uses @jridgewell/gen-mapping, which incorrectly has typed some types as nullable: https://github.com/jridgewell/gen-mapping/pull/9          output.map,        );      } catch (cause) {        throw new Error(          `Error processing the file: ${filename} by the Terser plugin.`,          { cause },        );      }    }
    async function filter(code: string): Promise<string | undefined> {      const output = await minify(code, options.options);      return output.code;    }  };}
/** Extends Helpers interface */declare global {  namespace Lume {    export interface Helpers {      /** @see https://lume.land/plugins/terser/#the-terser-filter */      terser: (code: string) => Promise<string | undefined>;    }  }}