refactored domain processing code to improve performance and memory usage

lib/utils.js

@@ -19,18 +19,18 @@ export const isValidDomain = (value) =>
  * @param {string} domain The domain to be extracted.
  * @returns {string[]}
  */
-export const extractDomain = (domain) =>
-  domain.split(".").reduce((previous, current, index, array) => {
-    const nextIndex = index + 1;
+export const extractDomain = (domain) => {
+  const parts = domain.split(".");
+  const extractedDomains = [];
 
-    if (nextIndex > array.length - 1) return previous;
+  for (let i = 0; i < parts.length; i++) {
+    const subdomains = parts.slice(i).join(".");
 
-    const domain = [current, ...array.slice(nextIndex)].join(".");
+    extractedDomains.unshift(subdomains);
+  }
 
-    previous.push(domain);
-
-    return previous;
-  }, []);
+  return extractedDomains;
+};
 
 /**
  * Checks if the value is a comment.