diff --git a/eslint.config.js b/eslint.config.js
index 59bc4bf..7e2525d 100644
--- a/eslint.config.js
+++ b/eslint.config.js
@@ -19,7 +19,7 @@ export default tseslint.config(
     },
     rules: {
       "@typescript-eslint/no-explicit-any": "warn",
-      "@typescript-eslint/no-unused-vars": ["warn", { argsIgnorePattern: "^_" }],
+      "@typescript-eslint/no-unused-vars": ["warn", { argsIgnorePattern: "^_", varsIgnorePattern: "^_" }],
       "no-console": ["warn", { allow: ["warn", "error", "info"] }],
     },
   },
diff --git a/src/cli/swagger-generator.ts b/src/cli/swagger-generator.ts
index dd516c5..5ad787c 100644
--- a/src/cli/swagger-generator.ts
+++ b/src/cli/swagger-generator.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
 import fs from "node:fs/promises";
 import path from "node:path";
 
diff --git a/src/utils/async/debounce.ts b/src/utils/async/debounce.ts
index 0802bd3..5d40bc3 100644
--- a/src/utils/async/debounce.ts
+++ b/src/utils/async/debounce.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
 import type {
     AsyncFunction,
     DebounceOptions,
diff --git a/src/utils/async/sequential.ts b/src/utils/async/sequential.ts
index 1c76afb..c75da24 100644
--- a/src/utils/async/sequential.ts
+++ b/src/utils/async/sequential.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
 import type { SequentialTask, SequentialOptions } from "./types.js";
 
 /**
diff --git a/src/utils/async/throttle.ts b/src/utils/async/throttle.ts
index 246bff4..da1fb2e 100644
--- a/src/utils/async/throttle.ts
+++ b/src/utils/async/throttle.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
 import type {
     AsyncFunction,
     ThrottleOptions,
diff --git a/src/utils/async/timeout.ts b/src/utils/async/timeout.ts
index 0c00ab1..d7de513 100644
--- a/src/utils/async/timeout.ts
+++ b/src/utils/async/timeout.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
 import { TimeoutError } from "./errors.js";
 import { sleep } from "./sleep.js";
 
diff --git a/src/utils/async/types.ts b/src/utils/async/types.ts
index f4a08d6..1ea9a91 100644
--- a/src/utils/async/types.ts
+++ b/src/utils/async/types.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
 /**
  * Type definitions for AsyncUtils module
  */
diff --git a/src/utils/core/ApiClient.ts b/src/utils/core/ApiClient.ts
index d84cc83..0273b22 100644
--- a/src/utils/core/ApiClient.ts
+++ b/src/utils/core/ApiClient.ts
@@ -1,3 +1,4 @@
+
 import { Logger } from "#core/Logger.js";
 import { UrlHelper } from "#helpers/UrlHelper.js";
 import { retry as retryFn } from "../async/retry.js";
@@ -45,6 +46,14 @@ export interface ApiClientConfig {
     circuitBreaker?: CircuitBreakerConfig;
 }
 
+export type RequestBody =
+    | Record<string, unknown>
+    | unknown[]
+    | string
+    | FormData
+    | Blob
+    | BufferSource;
+
 export interface RequestOptions<TResponse = unknown> extends Omit<
     RequestInit,
     "body"
@@ -638,7 +647,7 @@ export class ApiClient {
      * 2. RequestOptions: post("/path", { body: {...}, headers: {...} })
      */
     private normalizeBodyOrOptions<T>(
-        bodyOrOptions?: RequestOptions<T> | unknown
+        bodyOrOptions?: RequestOptions<T> | RequestBody
     ): RequestOptions<T> {
         if (!bodyOrOptions) {
             return {};
diff --git a/src/utils/core/SchemaAdapter.ts b/src/utils/core/SchemaAdapter.ts
index 9b7e8c8..a5e67f3 100644
--- a/src/utils/core/SchemaAdapter.ts
+++ b/src/utils/core/SchemaAdapter.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
 /**
  * Generic interface for schema validation adapters (e.g., Zod, Valibot, ArkType)
  */
diff --git a/src/utils/helpers/CryptoUtils.ts b/src/utils/helpers/CryptoUtils.ts
index 665a20c..246b5ce 100644
--- a/src/utils/helpers/CryptoUtils.ts
+++ b/src/utils/helpers/CryptoUtils.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
 /**
  * Cryptographic utilities for hashing, encoding, and token generation
  * Isomorphic crypto operations for Node.js and browsers
diff --git a/src/utils/helpers/PollingHelper.ts b/src/utils/helpers/PollingHelper.ts
index 67c8525..283436d 100644
--- a/src/utils/helpers/PollingHelper.ts
+++ b/src/utils/helpers/PollingHelper.ts
@@ -187,7 +187,7 @@ export class PollingHelper<T = unknown> {
             const {
                 result,
                 error,
-                responseTime: _responseTime,
+                responseTime: _,
             } = await this.executeAttempt(attempt, responseTimes);
 
             if (result !== undefined) {
diff --git a/tests/async/debounce.test.ts b/tests/async/debounce.test.ts
index f3709ab..3ca2ffb 100644
--- a/tests/async/debounce.test.ts
+++ b/tests/async/debounce.test.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
 import { describe, it, expect, beforeEach, vi } from "vitest";
 import { debounceAsync } from "../../src/utils/async/debounce";
 
diff --git a/tests/async/sequential.test.ts b/tests/async/sequential.test.ts
index 02d91da..6a17133 100644
--- a/tests/async/sequential.test.ts
+++ b/tests/async/sequential.test.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
 import { describe, it, expect } from "vitest";
 import { sequential } from "../../src/utils/async/sequential";
 import { sleep } from "../../src/utils/async/sleep";
diff --git a/tests/async/throttle.test.ts b/tests/async/throttle.test.ts
index f77e903..50229e7 100644
--- a/tests/async/throttle.test.ts
+++ b/tests/async/throttle.test.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
 import { describe, it, expect, beforeEach, vi } from "vitest";
 import { throttleAsync } from "../../src/utils/async/throttle";
 
diff --git a/tests/async/validation.test.ts b/tests/async/validation.test.ts
index 999a82e..a2a7106 100644
--- a/tests/async/validation.test.ts
+++ b/tests/async/validation.test.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
 import { describe, it, expect } from "vitest";
 import { timeout, withTimeout } from "../../src/utils/async/timeout";
 import { allSettled } from "../../src/utils/async/allSettled";
diff --git a/tests/cli-main.test.ts b/tests/cli-main.test.ts
index 0a82f9f..25e6d0a 100644
--- a/tests/cli-main.test.ts
+++ b/tests/cli-main.test.ts
@@ -17,7 +17,7 @@ describe("CLI main entry", () => {
 
         try {
             await runCli(["--invalid"]);
-        } catch (e) {
+        } catch {
             // ignore exit error
         }
 
diff --git a/tests/logger.test.ts b/tests/logger.test.ts
index 12b49fe..11087e6 100644
--- a/tests/logger.test.ts
+++ b/tests/logger.test.ts
@@ -1,3 +1,4 @@
+/* eslint-disable no-console */
 import {
     Logger,
     createLogger,
@@ -55,7 +56,7 @@ test("Logger.child creates nested namespaces", () => {
 test("consoleTransportNode formats correctly", () => {
     const originalLog = console.log;
     let output = "";
-    // eslint-disable-next-line no-console
+
     console.log = (msg) => {
         output = msg;
     };
@@ -71,7 +72,6 @@ test("consoleTransportNode formats correctly", () => {
 
     assert.match(output, /INFO.*\[test\].*hello/);
 
-    // eslint-disable-next-line no-console
     console.log = originalLog;
 });
 
@@ -82,7 +82,7 @@ test("consoleTransportBrowser formats correctly (mocked environment)", () => {
 
     const originalLog = console.log;
     let output = "";
-    // eslint-disable-next-line no-console
+
     console.log = (msg) => {
         output = msg;
     };
@@ -97,7 +97,6 @@ test("consoleTransportBrowser formats correctly (mocked environment)", () => {
 
     assert.match(output, /%cINFO.*\[test\].*hello/);
 
-    // eslint-disable-next-line no-console
     console.log = originalLog;
     delete globalThis.window;
     delete globalThis.document;
diff --git a/tests/new-utils.test.ts b/tests/new-utils.test.ts
index 61ad34d..f9f8630 100644
--- a/tests/new-utils.test.ts
+++ b/tests/new-utils.test.ts
@@ -5,8 +5,6 @@ import {
     PollingHelper,
     createPoller,
     CryptoUtils,
-    PaginationHelper,
-    createPaginator,
     CacheManager,
     createCacheManager,
     CompressionUtils,
diff --git a/tests/retry-policy.test.ts b/tests/retry-policy.test.ts
index 32c7b24..0eac3d7 100644
--- a/tests/retry-policy.test.ts
+++ b/tests/retry-policy.test.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
 import { RetryPolicy, CircuitBreaker } from "../src/index";
 
 test("RetryPolicy retries on failure and succeeds", async () => {
diff --git a/tests/schema-adapters.test.ts b/tests/schema-adapters.test.ts
index e3b926d..41e2655 100644
--- a/tests/schema-adapters.test.ts
+++ b/tests/schema-adapters.test.ts
@@ -11,7 +11,7 @@ describe("Schema Adapters for ApiClient", () => {
         // Mock fetch for tests
         globalThis.fetch = async (
             input: RequestInfo | URL,
-            init?: RequestInit
+            _init?: RequestInit
         ) => {
             const url = input.toString();
 
diff --git a/tests/setup.ts b/tests/setup.ts
index 1359723..3b68ce7 100644
--- a/tests/setup.ts
+++ b/tests/setup.ts
@@ -1,3 +1,4 @@
+/* eslint-disable @typescript-eslint/no-explicit-any */
 /**
  * Jest setup file for wiki documentation system tests
  * Configures property-based testing with fast-check