Some tweaks for me

.eleventyignore

@@ -0,0 +1,2 @@
+node_modules/
+dist/

eleventy.config.js

@@ -1,6 +1,8 @@
 import pluginFilters from "./_config/filters.js";
 
 export default async function(eleventyConfig) {
+  eleventyConfig.setUseGitIgnore(false);
+
 	eleventyConfig.addPlugin(pluginFilters);
 
   eleventyConfig.addCollection("series", collectionsApi => {

package-lock.json

@@ -7,7 +7,7 @@
     "": {
       "name": "site-theme",
       "version": "1.0.0",
-      "license": "ISC",
+      "license": "IST",
       "dependencies": {
         "@11ty/eleventy": "^3.0.0",
         "date-fns": "^4.1.0"

package.json

@@ -2,12 +2,13 @@
   "name": "site-theme",
   "version": "1.0.0",
   "main": "index.js",
+  "type":"module",
   "scripts": {
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "keywords": [],
   "author": "",
-  "license": "ISC",
+  "license": "IST",
   "description": "",
   "dependencies": {
     "@11ty/eleventy": "^3.0.0",