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Is your feature request related to a problem? Please describe. Would be great to add support for style.xsl files to display "pretty" RSS feeds.

Describe the solution you'd like

Describe alternatives you've considered

Here is my pnpm patch I'm currently running. Probably needs some proper types and testing. But hoping this might help some others hack their feed package.

[!NOTE] this also includes the image support from https://github.com/jpmonette/feed/issues/195

diff --git a/lib/atom1.js b/lib/atom1.js
index 18c1d2a059da879c382bcf621ad2349c6b7fbdeb..17af1a54e968e6a28c789c4fd8b52919c9bcce53 100644
--- a/lib/atom1.js
+++ b/lib/atom1.js
@@ -7,14 +7,32 @@ exports.default = (function (ins) {
     var options = ins.options;
     var base = {
         _declaration: { _attributes: { version: "1.0", encoding: "utf-8" } },
+        _instruction: {},
         feed: {
-            _attributes: { xmlns: "http://www.w3.org/2005/Atom" },
+            _attributes: {
+                xmlns: "http://www.w3.org/2005/Atom",
+                "xmlns:content": "http://purl.org/rss/1.0/modules/content/",
+                "xmlns:media": "http://search.yahoo.com/mrss/",
+                "xmlns:atom": "http://www.w3.org/2005/Atom"
+            },
             id: options.id,
             title: options.title,
             updated: options.updated ? options.updated.toISOString() : new Date().toISOString(),
             generator: utils_1.sanitize(options.generator || config_1.generator)
         }
     };
+    if (options.stylesheet) {
+        console.log('atom has stylesheet ')
+        base._instruction = {
+            "xml-stylesheet": {
+                _attributes: {
+                    href: options.stylesheet,
+                    type: "text/xsl"
+                }
+            }
+        }   
+    }
     if (options.author) {
         base.feed.author = formatAuthor(options.author);
     }
@@ -93,6 +111,10 @@ exports.default = (function (ins) {
         if (item.copyright) {
             entry.rights = item.copyright;
         }
+        if (item.image) {
+            entry['media:thumbnail'] = { _attributes: { url: item.image } };
+            entry['media:content'] = { _attributes: { medium: 'image', url: item.image } };
+        }
         base.feed.entry.push(entry);
     });
     return convert.js2xml(base, { compact: true, ignoreComment: true, spaces: 4 });
diff --git a/lib/rss2.js b/lib/rss2.js
index fcff0d41fa50b18eb08fe10b1088c1b6cc03698e..c228a20c03d18b9c7d32fe7a039d4f6d9a6c05f7 100644
--- a/lib/rss2.js
+++ b/lib/rss2.js
@@ -20,6 +20,7 @@ exports.default = (function (ins) {
     var isContent = false;
     var base = {
         _declaration: { _attributes: { version: "1.0", encoding: "utf-8" } },
+        _instruction: {},
         rss: {
             _attributes: { version: "2.0" },
             channel: {
@@ -32,6 +33,16 @@ exports.default = (function (ins) {
             },
         },
     };
+    if (options.stylesheet) {
+        base._instruction = {
+            "xml-stylesheet": {
+                _attributes: {
+                    href: options.stylesheet,
+                    type: "text/xsl"
+                }
+            }
+        }   
+    }
     if (options.language) {
         base.rss.channel.language = { _text: options.language };
     }
@@ -141,6 +152,7 @@ exports.default = (function (ins) {
     if (isContent) {
         base.rss._attributes["xmlns:dc"] = "http://purl.org/dc/elements/1.1/";
         base.rss._attributes["xmlns:content"] = "http://purl.org/rss/1.0/modules/content/";
+        base.rss._attributes["xmlns:media"] = "http://search.yahoo.com/mrss/";
     }
     if (isAtom) {
         base.rss._attributes["xmlns:atom"] = "http://www.w3.org/2005/Atom";
diff --git a/lib/typings/index.d.ts b/lib/typings/index.d.ts
index 6f149197d9e4c9e550e822375e220207fe264501..8a0ba950df36b2999e472ff1dd11a8a5490510cc 100644
--- a/lib/typings/index.d.ts
+++ b/lib/typings/index.d.ts
@@ -51,6 +51,7 @@ export interface FeedOptions {
     description?: string;
     image?: string;
     favicon?: string;
+    stylesheet?: string;
     copyright: string;
 }
 export interface Extension {