chore: lint for unused arguments

.eslintrc.js

@@ -7,6 +7,12 @@ module.exports = {
     sourceType: 'module'
   },
   rules: {
+    'no-unused-vars': [
+      'error',
+      // we are only using this rule to check for unused arguments since TS
+      // catches unused variables but not args.
+      { varsIgnorePattern: '.*', args: 'after-used' }
+    ],
     // most of the codebase are expected to be env agnostic
     'no-restricted-globals': ['error', ...DOMGlobals, ...NodeGlobals],
     // since we target ES2015 for baseline support, we need to forbid object