Add tsconfig file for new JavaScript

Author: NickColley

bin/tsconfig.json

@@ -0,0 +1,9 @@
+{
+  "extends": "../tsconfig.base.json",
+  "include": ["**/*.mjs"],
+  "exclude": ["**/*.test.*"],
+  "compilerOptions": {
+    "strictNullChecks": false,
+    "types": ["node"]
+  }
+}

tsconfig.json

@@ -5,6 +5,9 @@
     {
       "path": "./tsconfig.dev.json"
     },
+    {
+      "path": "./bin/tsconfig.json"
+    },
     {
       "path": "./packages/govuk-frontend-review/tsconfig.json"
     },