Fix lint

Author: hsubox76

packages/app-check/package.json

@@ -16,7 +16,7 @@
     "build": "rollup -c",
     "build:deps": "lerna run --scope @firebase/app-check --include-dependencies build",
     "dev": "rollup -c -w",
-    "test": "yarn type-check && yarn test:browser",
+    "test": "yarn lint && yarn type-check && yarn test:browser",
     "test:ci": "node ../../scripts/run_tests_in_ci.js",
     "test:browser": "karma start --single-run",
     "test:browser:debug": "karma start --browsers Chrome --auto-watch",

packages/app-check/src/api.test.ts

@@ -16,7 +16,7 @@
  */
 import '../test/setup';
 import { expect } from 'chai';
-import { stub, spy, restore } from 'sinon';
+import { stub, spy } from 'sinon';
 import {
   activate,
   setTokenAutoRefreshEnabled,