build: fix eslint issues (#124)

* build: fix eslint issues

* build: migrate to Node 16

src/client/.eslintrc.json

@@ -1,6 +1,6 @@
 {
   "root": true,
-  "parser": "babel-eslint",
+  "parser": "@babel/eslint-parser",
   "extends": [
     "airbnb-base",
     "plugin:prettier/recommended",
@@ -30,18 +30,16 @@
     "import/prefer-default-export": "warn",
     "import/no-extraneous-dependencies": "warn",
     "prefer-object-spread": "warn",
-    "rules": {
-      "import/extensions": [
-        "error",
-        "ignorePackages",
-        {
-          "js": "never",
-          "jsx": "never",
-          "ts": "never",
-          "tsx": "never"
-        }
-      ]
-    }
+    "import/extensions": [
+      "error",
+      "ignorePackages",
+      {
+        "js": "never",
+        "jsx": "never",
+        "ts": "never",
+        "tsx": "never"
+      }
+    ]
   },
   "settings": {
     "react": {

src/server/.eslintrc.json

@@ -1,6 +1,6 @@
 {
   "root": true,
-  "parser": "babel-eslint",
+  "parser": "@babel/eslint-parser",
   "extends": ["airbnb-base", "plugin:prettier/recommended"],
   "plugins": ["prettier", "googleappsscript"],
   "env": {