diff --git a/.husky/pre-commit b/.husky/pre-commit
index 57fb103..1ac5081 100644
--- a/.husky/pre-commit
+++ b/.husky/pre-commit
@@ -1 +1,2 @@
+#!/bin/sh
 npx lint-staged && npm run typecheck && npm test
diff --git a/package.json b/package.json
index 3240bcb..df540a9 100644
--- a/package.json
+++ b/package.json
@@ -32,6 +32,7 @@
     "@types/mailparser": "^3.4.6",
     "@types/rss": "^0.0.32",
     "@vitest/coverage-v8": "^4.0.18",
+    "eslint": "^10.0.0",
     "eslint-config-prettier": "^10.1.8",
     "happy-dom": "^20.5.0",
     "husky": "^9.1.7",
diff --git a/src/types/index.ts b/src/types/index.ts
index 7bc7b86..92f2a08 100644
--- a/src/types/index.ts
+++ b/src/types/index.ts
@@ -71,7 +71,7 @@ declare global {
   // This is not an ideal solution but works for our example
   interface KVNamespace {
     get(key: string, options?: { type: "text" }): Promise<string | null>;
-    get(key: string, options: { type: "json" }): Promise<unknown>;
+    get(key: string, options: { type: "json" }): Promise<unknown | null>;
     get(
       key: string,
       options: { type: "arrayBuffer" },