(function (Prism) {
  Prism.languages.insertBefore('javascript', 'function-variable', {
    'method-variable': {
      pattern: RegExp(
        '(\\.\\s*)' +
          Prism.languages.javascript['function-variable'].pattern.source
      ),
      lookbehind: true,
      alias: ['function-variable', 'method', 'function', 'property-access'],
    },
  });

  Prism.languages.insertBefore('javascript', 'function', {
    method: {
      pattern: RegExp(
        '(\\.\\s*)' + Prism.languages.javascript['function'].source
      ),
      lookbehind: true,
      alias: ['function', 'property-access'],
    },
  });

  Prism.languages.insertBefore('javascript', 'constant', {
    'known-class-name': [
      {
        // standard built-ins
        // https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects
        pattern:
          /\b(?:(?:Float(?:32|64)|(?:Int|Uint)(?:8|16|32)|Uint8Clamped)?Array|ArrayBuffer|BigInt|Boolean|DataView|Date|Error|Function|Intl|JSON|(?:Weak)?(?:Map|Set)|Math|Number|Object|Promise|Proxy|Reflect|RegExp|String|Symbol|WebAssembly)\b/,
        alias: 'class-name',
      },
      {
        // errors
        pattern: /\b(?:[A-Z]\w*)Error\b/,
        alias: 'class-name',
      },
    ],
  });

  /**
   * Replaces the `<ID>` placeholder in the given pattern with a pattern for general JS identifiers.
   *
   * @param {string} source
   * @param {string} [flags]
   * @returns {RegExp}
   */
  function withId(source, flags) {
    return RegExp(
      source.replace(/<ID>/g, function () {
        return /(?!\s)[_$a-zA-Z\xA0-\uFFFF](?:(?!\s)[$\w\xA0-\uFFFF])*/.source;
      }),
      flags
    );
  }
  Prism.languages.insertBefore('javascript', 'keyword', {
    imports: {
      // https://tc39.es/ecma262/#sec-imports
      pattern: withId(
        /(\bimport\b\s*)(?:<ID>(?:\s*,\s*(?:\*\s*as\s+<ID>|\{[^{}]*\}))?|\*\s*as\s+<ID>|\{[^{}]*\})(?=\s*\bfrom\b)/
          .source
      ),
      lookbehind: true,
      inside: Prism.languages.javascript,
    },
    exports: {
      // https://tc39.es/ecma262/#sec-exports
      pattern: withId(
        /(\bexport\b\s*)(?:\*(?:\s*as\s+<ID>)?(?=\s*\bfrom\b)|\{[^{}]*\})/
          .source
      ),
      lookbehind: true,
      inside: Prism.languages.javascript,
    },
  });

  Prism.languages.javascript['keyword'].unshift(
    {
      pattern: /\b(?:as|default|export|from|import)\b/,
      alias: 'module',
    },
    {
      pattern:
        /\b(?:await|break|catch|continue|do|else|finally|for|if|return|switch|throw|try|while|yield)\b/,
      alias: 'control-flow',
    },
    {
      pattern: /\bnull\b/,
      alias: ['null', 'nil'],
    },
    {
      pattern: /\bundefined\b/,
      alias: 'nil',
    }
  );

  Prism.languages.insertBefore('javascript', 'operator', {
    spread: {
      pattern: /\.{3}/,
      alias: 'operator',
    },
    arrow: {
      pattern: /=>/,
      alias: 'operator',
    },
  });

  Prism.languages.insertBefore('javascript', 'punctuation', {
    'property-access': {
      pattern: withId(/(\.\s*)#?<ID>/.source),
      lookbehind: true,
    },
    'maybe-class-name': {
      pattern: /(^|[^$\w\xA0-\uFFFF])[A-Z][$\w\xA0-\uFFFF]+/,
      lookbehind: true,
    },
    dom: {
      // this contains only a few commonly used DOM variables
      pattern:
        /\b(?:document|(?:local|session)Storage|location|navigator|performance|window)\b/,
      alias: 'variable',
    },
    console: {
      pattern: /\bconsole(?=\s*\.)/,
      alias: 'class-name',
    },
  });

  // add 'maybe-class-name' to tokens which might be a class name
  var maybeClassNameTokens = [
    'function',
    'function-variable',
    'method',
    'method-variable',
    'property-access',
  ];

  for (var i = 0; i < maybeClassNameTokens.length; i++) {
    var token = maybeClassNameTokens[i];
    var value = Prism.languages.javascript[token];

    // convert regex to object
    if (Prism.util.type(value) === 'RegExp') {
      value = Prism.languages.javascript[token] = {
        pattern: value,
      };
    }

    // keep in mind that we don't support arrays

    var inside = value.inside || {};
    value.inside = inside;

    inside['maybe-class-name'] = /^[A-Z][\s\S]*/;
  }
})(Prism);