diff --git a/v-next/hardhat-chai-matchers/src/internal/changeTokenBalance.ts b/v-next/hardhat-chai-matchers/src/internal/changeTokenBalance.ts
index 926ddd1161..2018502373 100644
--- a/v-next/hardhat-chai-matchers/src/internal/changeTokenBalance.ts
+++ b/v-next/hardhat-chai-matchers/src/internal/changeTokenBalance.ts
@@ -214,7 +214,14 @@ function checkToken(token: unknown, method: string) {
         method,
       },
     );
-  } else if ((token as any).interface.getFunction("balanceOf") === null) {
+  } else if (
+    isObject(token) &&
+    "interface" in token &&
+    isObject(token.interface) &&
+    "getFunction" in token.interface &&
+    typeof token.interface.getFunction === "function" &&
+    token.interface.getFunction("balanceOf") === null
+  ) {
     throw new HardhatError(
       HardhatError.ERRORS.CHAI_MATCHERS.CONTRACT_IS_NOT_AN_ERC20_TOKEN,
     );
diff --git a/v-next/hardhat-chai-matchers/src/internal/constants.ts b/v-next/hardhat-chai-matchers/src/internal/constants.ts
index 44022c9877..481b77c834 100644
--- a/v-next/hardhat-chai-matchers/src/internal/constants.ts
+++ b/v-next/hardhat-chai-matchers/src/internal/constants.ts
@@ -1,5 +1,3 @@
-// TODO: check if all are used
-
 export const ASSERTION_ABORTED = "hh-chai-matchers-assertion-aborted";
 export const PREVIOUS_MATCHER_NAME = "previousMatcherName";
 
diff --git a/v-next/hardhat-chai-matchers/src/internal/reverted/utils.ts b/v-next/hardhat-chai-matchers/src/internal/reverted/utils.ts
index b378c91b23..6a71199e97 100644
--- a/v-next/hardhat-chai-matchers/src/internal/reverted/utils.ts
+++ b/v-next/hardhat-chai-matchers/src/internal/reverted/utils.ts
@@ -21,6 +21,7 @@ const PANIC_CODE_PREFIX = "0x4e487b71";
  */
 export function getReturnDataFromError(error: any): string {
   if (!(error instanceof Error)) {
+    // eslint-disable-next-line no-restricted-syntax -- keep the original chai error structure
     throw new AssertionError("Expected an Error object");
   }