diff --git a/Build/build-reject-domainset.ts b/Build/build-reject-domainset.ts
index 1a3492ce..7172858f 100644
--- a/Build/build-reject-domainset.ts
+++ b/Build/build-reject-domainset.ts
@@ -18,7 +18,7 @@ import * as tldts from 'tldts-experimental';
 import { SHARED_DESCRIPTION } from './lib/constants';
 import { getPhishingDomains } from './lib/get-phishing-domains';
 
-import { add as SetAdd, subtract as SetSubstract } from 'mnemonist/set';
+import { subtract as SetSubstract } from 'mnemonist/set';
 import { setAddFromArray, setAddFromArrayCurried } from './lib/set-add-from-array';
 import { sort } from './lib/timsort';
 
@@ -27,6 +27,7 @@ export const buildRejectDomainSet = task(import.meta.path, async (span) => {
   const filterRuleWhitelistDomainSets = new Set(PREDEFINED_WHITELIST);
 
   const domainSets = new Set<string>();
+  const appendArrayToDomainSets = setAddFromArrayCurried(domainSets);
 
   // Parse from AdGuard Filters
   const shouldStop = await span
@@ -36,33 +37,35 @@ export const buildRejectDomainSet = task(import.meta.path, async (span) => {
       let shouldStop = false;
       await Promise.all([
         // Parse from remote hosts & domain lists
-        ...HOSTS.map(entry => processHosts(childSpan, ...entry).then(setAddFromArrayCurried(domainSets))),
+        ...HOSTS.map(entry => processHosts(childSpan, ...entry).then(appendArrayToDomainSets)),
 
-        ...DOMAIN_LISTS.map(entry => processDomainLists(childSpan, ...entry).then(setAddFromArrayCurried(domainSets))),
+        ...DOMAIN_LISTS.map(entry => processDomainLists(childSpan, ...entry).then(appendArrayToDomainSets)),
 
-        ...ADGUARD_FILTERS.map(input => (
-          typeof input === 'string'
-            ? processFilterRules(childSpan, input)
-            : processFilterRules(childSpan, ...input)
-        ).then(({ white, black, foundDebugDomain }) => {
-          if (foundDebugDomain) {
-            // eslint-disable-next-line sukka/no-single-return -- not single return
-            shouldStop = true;
-            // we should not break here, as we want to see full matches from all data source
-          }
-          setAddFromArray(filterRuleWhitelistDomainSets, white);
-          setAddFromArray(domainSets, black);
-        })),
+        ...ADGUARD_FILTERS.map(
+          input => processFilterRules(childSpan, ...input)
+            .then(({ white, black, foundDebugDomain }) => {
+              if (foundDebugDomain) {
+                // eslint-disable-next-line sukka/no-single-return -- not single return
+                shouldStop = true;
+                // we should not break here, as we want to see full matches from all data source
+              }
+              setAddFromArray(filterRuleWhitelistDomainSets, white);
+              setAddFromArray(domainSets, black);
+            })
+        ),
         ...([
           'https://raw.githubusercontent.com/AdguardTeam/AdGuardSDNSFilter/master/Filters/exceptions.txt',
           'https://raw.githubusercontent.com/AdguardTeam/AdGuardSDNSFilter/master/Filters/exclusions.txt'
-        ].map(input => processFilterRules(childSpan, input).then(({ white, black }) => {
-          setAddFromArray(filterRuleWhitelistDomainSets, white);
-          setAddFromArray(filterRuleWhitelistDomainSets, black);
-        }))),
-        getPhishingDomains(childSpan).then(setAddFromArrayCurried(domainSets)),
+        ].map(
+          input => processFilterRules(childSpan, input)
+            .then(({ white, black }) => {
+              setAddFromArray(filterRuleWhitelistDomainSets, white);
+              setAddFromArray(filterRuleWhitelistDomainSets, black);
+            })
+        )),
+        getPhishingDomains(childSpan).then(appendArrayToDomainSets),
         childSpan.traceChildAsync('process reject_sukka.conf', () => readFileIntoProcessedArray(path.resolve(import.meta.dir, '../Source/domainset/reject_sukka.conf'))
-          .then(setAddFromArrayCurried(domainSets)))
+          .then(appendArrayToDomainSets))
       ]);
       // eslint-disable-next-line sukka/no-single-return -- not single return
       return shouldStop;
diff --git a/Build/lib/fetch-retry.ts b/Build/lib/fetch-retry.ts
index 09539272..1c475152 100644
--- a/Build/lib/fetch-retry.ts
+++ b/Build/lib/fetch-retry.ts
@@ -42,28 +42,30 @@ interface FetchRetryOpt {
   retries?: number,
   factor?: number,
   maxRetryAfter?: number,
-  retry?: number,
-  onRetry?: (err: Error) => void,
-  retryOnAborted?: boolean
+  // onRetry?: (err: Error) => void,
+  retryOnAborted?: boolean,
+  retryOnNon2xx?: boolean
 }
 
 interface FetchWithRetry {
   (url: string | URL | Request, opts?: RequestInit & { retry?: FetchRetryOpt }): Promise<Response>
 }
 
+const DEFAULT_OPT: Required<FetchRetryOpt> = {
+  // timeouts will be [10, 60, 360, 2160, 12960]
+  // (before randomization is added)
+  minTimeout: MIN_TIMEOUT,
+  retries: MAX_RETRIES,
+  factor: FACTOR,
+  maxRetryAfter: MAX_RETRY_AFTER,
+  retryOnAborted: false,
+  retryOnNon2xx: true
+};
+
 function createFetchRetry($fetch: typeof fetch): FetchWithRetry {
   const fetchRetry: FetchWithRetry = async (url, opts = {}) => {
     const retryOpts = Object.assign(
-      {
-        // timeouts will be [10, 60, 360, 2160, 12960]
-        // (before randomization is added)
-        minTimeout: MIN_TIMEOUT,
-        retries: MAX_RETRIES,
-        factor: FACTOR,
-        maxRetryAfter: MAX_RETRY_AFTER,
-        retryOnAborted: false,
-        retryOnNon2xx: true
-      },
+      DEFAULT_OPT,
       opts.retry
     );
 
diff --git a/Build/lib/get-phishing-domains.ts b/Build/lib/get-phishing-domains.ts
index 8faf5425..8296fadf 100644
--- a/Build/lib/get-phishing-domains.ts
+++ b/Build/lib/get-phishing-domains.ts
@@ -131,13 +131,11 @@ export const getPhishingDomains = (parentSpan: Span) => parentSpan.traceChild('g
     }
   });
 
-  span.traceChildSync('get final phishing results', () => {
-    for (const domain in domainCountMap) {
-      if (domainCountMap[domain] >= 8) {
-        domainArr.push(`.${domain}`);
-      }
+  for (const domain in domainCountMap) {
+    if (domainCountMap[domain] >= 8) {
+      domainArr.push(`.${domain}`);
     }
-  });
+  }
 
   return domainArr;
 });
diff --git a/Build/lib/reject-data-source.ts b/Build/lib/reject-data-source.ts
index baf53748..92747bf3 100644
--- a/Build/lib/reject-data-source.ts
+++ b/Build/lib/reject-data-source.ts
@@ -78,7 +78,7 @@ export const PHISHING_DOMAIN_LISTS: [HostsSource, HostsSource] = [
   ]
 ] as const;
 
-type AdGuardFilterSource = string | [main: string, mirrors: string[] | null, ttl: number];
+type AdGuardFilterSource = [main: string, mirrors: string[] | null, ttl: number];
 
 export const ADGUARD_FILTERS: AdGuardFilterSource[] = [
   // EasyList