feat: added manifest, preload and prefetch

Author: cap-Bernardito

README.md

@@ -85,7 +85,7 @@ Supported tags and attributes:
 - the `href` attribute of the `image` tag
 - the `xlink:href` attribute of the `use` tag
 - the `href` attribute of the `use` tag
-- the `href` attribute of the `link` tag when the `rel` attribute contains `stylesheet`, `icon`, `shortcut icon`, `mask-icon`, `apple-touch-icon`, `apple-touch-icon-precomposed`, `apple-touch-startup-image`
+- the `href` attribute of the `link` tag when the `rel` attribute contains `stylesheet`, `icon`, `shortcut icon`, `mask-icon`, `apple-touch-icon`, `apple-touch-icon-precomposed`, `apple-touch-startup-image`, `manifest`, `prefetch`, `preload`
 - the `content` attribute of the `meta` tag when the `name` attribute is `msapplication-tileimage`, `msapplication-square70x70logo`, `msapplication-square150x150logo`, `msapplication-wide310x150logo`, `msapplication-square310x310logo`, `msapplication-config` or when the `property` attribute is `og:image`, `og:image:url`, `og:image:secure_url`, `og:audio`, `og:audio:secure_url`, `og:video`, `og:video:secure_url`, `vk:image`
 
 #### `Boolean`

src/utils.js

@@ -559,9 +559,12 @@ function linkHrefFilter(tag, attribute, attributes) {
     'apple-touch-icon',
     'apple-touch-icon-precomposed',
     'apple-touch-startup-image',
+    'manifest',
+    'prefetch',
+    'preload',
   ];
 
-  return allowedRels.filter((value) => usedRels.includes(value));
+  return allowedRels.filter((value) => usedRels.includes(value)).length > 0;
 }
 
 function metaContentFilter(tag, attribute, attributes) {

test/__snapshots__/esModule-option.test.js.snap

@@ -150,6 +150,9 @@ <h2>An Ordered HTML List</h2>
 <link rel="shortlink" type="text/html" href="http://flic.kr/p/6XuLyD">
 <link type="text/css" href="./style.file.css">
 <link rel="pingback" href="http://bob.example.net/xmlrpcserver">
+<link rel="preload" href="./style.file.css">
+<link rel="prefetch" href="image.png">
+<link rel="modulepreload" href="script.js">
 <a rel="author" href="./simple.html">link text</a>
 
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