Use @eslint/eslintrc package to convert Standard's config (#15)

* Remove nearly everything, bump ESLint minimum version

* Re-add standard, add eslintrc package

* Use FlatCompat to import eslint-config-standard

* Use shorthand for importing from ./lib

eslint.config.js

@@ -1 +1 @@
-module.exports = require('./lib/index');
+module.exports = require('./lib');

lib/index.js

@@ -1,26 +1,13 @@
-/*
- * Import global identifiers from different JavaScript environments.
- *
- * @see {@link https://www.npmjs.com/package/globals}
- * @see {@link https://github.com/sindresorhus/globals/blob/HEAD/globals.json}
- */
-const globals = require('globals');
+const { FlatCompat } = require('@eslint/eslintrc');
 
-/*
- * Import Standard's ESLint configurtation for use with ESLint's new "flat"
- * configuration file format.
- *
- * @see {@link https://github.com/standard/eslint-config-standard/blob/master/.eslintrc.json}
- * @see {@link https://eslint.org/docs/latest/use/configure/configuration-files-new}
- */
-const standard = require('eslint-config-standard');
+const compat = new FlatCompat({
+  baseDirectory: __dirname
+});
 
 module.exports = [
+  ...compat.extends('standard'),
   {
-    plugins: Object.fromEntries(standard.plugins.map(plugin => [plugin, require(`eslint-plugin-${plugin}`)])),
     rules: {
-      ...standard.rules,
-
       /*
        * Enforces consistent use of semicolons.
        *
@@ -40,20 +27,5 @@ module.exports = [
         named: 'never'
       }]
     }
-  },
-  {
-    /*
-     * By default, ESLint's "flat" config considers `*.js` files as ECMAScript
-     * modules (ESM). Instead, consider `*.js` files to be CommonJS modules.
-     *
-     * @see {@link https://eslint.org/docs/latest/use/configure/configuration-files-new#configuration-objects}
-     */
-    files: ['**/*.js'],
-    languageOptions: {
-      globals: {
-        ...globals.commonjs
-      },
-      sourceType: 'commonjs'
-    }
   }
 ];