Upgrade to Eleventy 3.0.0

config/filters/excerpt.js

@@ -8,7 +8,7 @@ const createExcerpt = (post, limit ) => {
         }
         return withoutTags;
 }
-module.exports = function (eleventyConfig) {
+export default function (eleventyConfig) {
     eleventyConfig.addFilter('excerpt', (post, limit = 250) => {
         return post.data.excerpt || createExcerpt(post, limit);
     });