fix: custom parser generator

- swap fs import
- fix rollup config

dist/mercury.js

@@ -4,6 +4,7 @@ function _interopDefault (ex) { return (ex && (typeof ex === 'object') && 'defau
 
 var _regeneratorRuntime = _interopDefault(require('@babel/runtime-corejs2/regenerator'));
 var _objectSpread = _interopDefault(require('@babel/runtime-corejs2/helpers/objectSpread'));
+var _objectWithoutProperties = _interopDefault(require('@babel/runtime-corejs2/helpers/objectWithoutProperties'));
 var _asyncToGenerator = _interopDefault(require('@babel/runtime-corejs2/helpers/asyncToGenerator'));
 var URL = _interopDefault(require('url'));
 var cheerio = _interopDefault(require('cheerio'));
@@ -178,13 +179,16 @@ function excerptContent(content) {
 
 function getEncoding(str) {
   var encoding = DEFAULT_ENCODING;
+  var matches = ENCODING_RE.exec(str);
 
-  if (ENCODING_RE.test(str)) {
-    var testEncode = ENCODING_RE.exec(str)[1];
+  if (matches !== null) {
+    var _matches = _slicedToArray(matches, 2);
 
-    if (iconv.encodingExists(testEncode)) {
-      encoding = testEncode;
-    }
+    str = _matches[1];
+  }
+
+  if (iconv.encodingExists(str)) {
+    encoding = str;
   }
 
   return encoding;
@@ -1701,10 +1705,10 @@ var Resource = {
     var decodedContent = iconv.decode(content, encoding);
     var $ = cheerio.load(decodedContent); // after first cheerio.load, check to see if encoding matches
 
-    var metaContentType = $('meta[http-equiv=content-type]').attr('content');
+    var metaContentType = $('meta[http-equiv=content-type i]').attr('content') || $('meta[charset]').attr('charset');
     var properEncoding = getEncoding(metaContentType); // if encodings in the header/body dont match, use the one in the body
 
-    if (properEncoding !== encoding) {
+    if (metaContentType && properEncoding !== encoding) {
       decodedContent = iconv.decode(content, properEncoding);
       $ = cheerio.load(decodedContent);
     }
@@ -6429,8 +6433,10 @@ var Mercury = {
   parse: function () {
     var _parse = _asyncToGenerator(
     /*#__PURE__*/
-    _regeneratorRuntime.mark(function _callee(url, html) {
-      var opts,
+    _regeneratorRuntime.mark(function _callee(url) {
+      var _ref,
+          html,
+          opts,
           _opts$fetchAllPages,
           fetchAllPages,
           _opts$fallback,
@@ -6451,7 +6457,7 @@ var Mercury = {
         while (1) {
           switch (_context.prev = _context.next) {
             case 0:
-              opts = _args.length > 2 && _args[2] !== undefined ? _args[2] : {};
+              _ref = _args.length > 1 && _args[1] !== undefined ? _args[1] : {}, html = _ref.html, opts = _objectWithoutProperties(_ref, ["html"]);
               _opts$fetchAllPages = opts.fetchAllPages, fetchAllPages = _opts$fetchAllPages === void 0 ? true : _opts$fetchAllPages, _opts$fallback = opts.fallback, fallback = _opts$fallback === void 0 ? true : _opts$fallback, _opts$contentType = opts.contentType, contentType = _opts$contentType === void 0 ? 'html' : _opts$contentType; // if no url was passed and this is the browser version,
               // set url to window.location.href and load the html
               // from the current page
@@ -6549,7 +6555,7 @@ var Mercury = {
       }, _callee, this);
     }));
 
-    function parse(_x, _x2) {
+    function parse(_x) {
       return _parse.apply(this, arguments);
     }
 

scripts/rollup.config.js

@@ -1,15 +1,20 @@
 /* eslint-disable import/no-extraneous-dependencies */
 import babel from 'rollup-plugin-babel';
-import babelrc from 'babelrc-rollup'; // eslint-disable-line import/extensions
 import commonjs from 'rollup-plugin-commonjs';
 
-const babelOpts = babelrc();
-babelOpts.runtimeHelpers = true;
-
 export default {
-  entry: './scripts/generate-custom-parser.js',
-  plugins: [commonjs(), babel(babelOpts)],
-  format: 'cjs',
-  dest: 'dist/generate-custom-parser.js', // equivalent to --output
-  sourceMap: true,
+  input: 'scripts/generate-custom-parser.js',
+  plugins: [
+    commonjs(),
+    babel({
+      externalHelpers: false,
+      runtimeHelpers: true,
+    }),
+  ],
+  treeshake: true,
+  output: {
+    file: 'dist/generate-custom-parser.js',
+    format: 'cjs',
+    sourceMap: true,
+  },
 };