1 files changed, 6 insertions, 4 deletions
diff --git a/packages/cli/src/test-utils/customMatchers.ts b/packages/cli/src/test-utils/customMatchers.ts
index c0b4df6b..26eac07b 100644
--- a/packages/cli/src/test-utils/customMatchers.ts
+++ b/packages/cli/src/test-utils/customMatchers.ts
@@ -12,15 +12,16 @@
  * SPDX-License-Identifier: Apache-2.0
  */
 
-import { expect } from 'vitest';
+import { Assertion, expect } from 'vitest';
 import type { TextBuffer } from '../ui/components/shared/text-buffer.js';
 
 // RegExp to detect invalid characters: backspace, and ANSI escape codes
 // eslint-disable-next-line no-control-regex
 const invalidCharsRegex = /[\b\x1b]/;
 
-function toHaveOnlyValidCharacters(this: vi.Assertion, buffer: TextBuffer) {
-  const { isNot } = this;
+function toHaveOnlyValidCharacters(this: Assertion, buffer: TextBuffer) {
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+  const { isNot } = this as any;
   let pass = true;
   const invalidLines: Array<{ line: number; content: string }> = [];
 
@@ -50,7 +51,8 @@ function toHaveOnlyValidCharacters(this: vi.Assertion, buffer: TextBuffer) {
 
 expect.extend({
   toHaveOnlyValidCharacters,
-});
+  // eslint-disable-next-line @typescript-eslint/no-explicit-any
+} as any);
 
 // Extend Vitest's `expect` interface with the custom matcher's type definition.
 declare module 'vitest' {