Using the Podcast Tools plugin

Just like the RSS plugin, we need to install this from npm and initialize it in the configuration file:

npm install eleventy-plugin-podcast-tools
const pluginRss = require("@11ty/eleventy-plugin-rss");
const podcastTools = require ('eleventy-plugin-podcast-tools');
module.exports = function(eleventyConfig) {
    eleventyConfig.addPlugin(pluginRss);
    eleventyConfig.addPlugin(podcastTools);
// ... The rest of the configuration file
}

Now, we have access to the file size filter. This filter takes a path to a file and if it’s an audio file, it will return the size in bytes for valid RSS. Now we have everything we need for a valid enclosure tag in our RSS feed. In the loop for each item, add the following code:

<enclosure
    url="{{absolutePostUrl}}"
    length="{{ audioPath | filesize }}"
    type...