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import { minify } from "../deps/terser.ts";import { basename } from "../deps/path.ts";import { merge } from "../core/utils.ts";import { Exception } from "../core/errors.ts";import { Page } from "../core/filesystem.ts";
import type { Helper, Site } from "../core.ts";import type { TerserOptions } from "../deps/terser.ts";
export interface Options {  /** The list of extensions this plugin applies to */  extensions: string[];
  /** Set `true` to generate source map files */  sourceMap: boolean;
  /** Options passed to `terser` */  options: Partial<TerserOptions>;}
// Default optionsexport const defaults: Options = {  extensions: [".js"],  sourceMap: false,  options: {    module: true,    compress: true,    mangle: true,  },};
/** A plugin to load all JavaScript files and minify them using Terser */export default function (userOptions?: Partial<Options>) {  const options = merge(defaults, userOptions);
  return (site: Site) => {    site.loadAssets(options.extensions);    site.process(options.extensions, terser);    site.filter("terser", filter as Helper, true);
    async function terser(file: Page) {      const filename = file.dest.path + file.dest.ext;      const content = file.content;      const terserOptions = { ...options.options };
      if (options.sourceMap) {        terserOptions.sourceMap = {          filename,          url: basename(filename) + ".map",        };      }
      try {        const output = await minify({ [filename]: content }, terserOptions);        file.content = output.code;
        if (output.map) {          const mapFile = new Page();          mapFile.dest = {            path: file.dest.path,            ext: ".js.map",          };          mapFile.content = output.map;          site.pages.push(mapFile);        }      } catch (cause) {        throw new Exception(          "Error processing the file",          { name: "Plugin Terser", cause, page: file, content },        );      }    }
    async function filter(code: string) {      const output = await minify(code, options.options);      return output.code;    }  };}