Add switch exhaustiveness check

lepsch · lepsch · commit d5586bde3c9b · 2020-08-07T12:43:24.000+01:00
diff --git a/index.js b/index.js
@@ -19,6 +19,7 @@ module.exports = {
         allowString: true,
       },
     ],
+    '@typescript-eslint/switch-exhaustiveness-check': 'error',
     'comma-dangle': [
       'error',
       'always-multiline',
