diff --git a/src/fromOpenApi/fromOpenApi.ts b/src/fromOpenApi/fromOpenApi.ts
index 6290aec..71f4172 100644
--- a/src/fromOpenApi/fromOpenApi.ts
+++ b/src/fromOpenApi/fromOpenApi.ts
@@ -4,7 +4,7 @@ import SwaggerParser from '@apidevtools/swagger-parser'
 import { normalizeSwaggerUrl } from './utils/normalizeSwaggerUrl.js'
 import { getServers } from './utils/getServers.js'
 import { isAbsoluteUrl, joinPaths } from './utils/url.js'
-import { createResponseResolver, createResponseResolverFromContent } from './utils/openApiUtils.js'
+import { createResponseResolver } from './utils/openApiUtils.js'
 
 type SupportedHttpMethods = keyof typeof http
 const supportedHttpMethods = Object.keys(
@@ -95,7 +95,6 @@ export async function fromOpenApi(
 
           requestHandlers.push(handler)
         }
-
       }
     }
   }
diff --git a/test/support/withHandlers.ts b/test/support/withHandlers.ts
index f6dca5d..b58c31e 100644
--- a/test/support/withHandlers.ts
+++ b/test/support/withHandlers.ts
@@ -5,6 +5,9 @@ import { setupServer } from 'msw/node'
  * Creates an MSW `server` instance, populates it
  * with the given `handlers`, runs the `callback`,
  * and cleans up afterward.
+ *
+ * @deprecated Remove this once all tests are migrated
+ * NOT to use this. Use `inspectHandlers` instead.
  */
 export async function withHandlers<R>(
   handlers: Array<RequestHandler>,
diff --git a/vitest.d.ts b/vitest.d.ts
new file mode 100644
index 0000000..eeb6bba
--- /dev/null
+++ b/vitest.d.ts
@@ -0,0 +1,13 @@
+import type { Assertion, AsymmetricMatchersContaining } from 'vitest'
+
+interface CustomMatchers<R = unknown> {
+  /**
+   * Compare two `Uint8Array` arrays.
+   */
+  toEqualBytes: (expected: Uint8Array) => R
+}
+
+declare module 'vitest' {
+  interface Assertion<T = any> extends CustomMatchers<T> {}
+  interface AsymmetricMatchersContaining extends CustomMatchers {}
+}