Improve Core types in preparation for ts v4.7.4

packages/core/http/core-http-router-server-internal/src/versioned_router/core_versioned_route.ts

@@ -161,19 +161,19 @@ export class CoreVersionedRoute implements VersionedRoute {
     ) {
       try {
         const { body, params, query } = validate(req, validation.request, handler.options.version);
-        (req as Mutable<KibanaRequest>).body = body;
-        (req as Mutable<KibanaRequest>).params = params;
-        (req as Mutable<KibanaRequest>).query = query;
+        req.body = body;
+        req.params = params;
+        req.query = query;
       } catch (e) {
         return res.badRequest({
           body: e.message,
         });
       }
     } else {
       // Preserve behavior of not passing through unvalidated data
-      (req as Mutable<KibanaRequest>).body = {};
-      (req as Mutable<KibanaRequest>).params = {};
-      (req as Mutable<KibanaRequest>).query = {};
+      req.body = {};
+      req.params = {};
+      req.query = {};
     }
 
     const response = await handler.fn(ctx, req, res);

packages/core/http/core-http-router-server-internal/src/versioned_router/route_version_utils.ts

@@ -52,7 +52,9 @@ type KibanaRequestWithQueryVersion = KibanaRequest<
   { [ELASTIC_HTTP_VERSION_QUERY_PARAM]: unknown }
 >;
 
-export function hasQueryVersion(request: KibanaRequest): request is KibanaRequestWithQueryVersion {
+export function hasQueryVersion(
+  request: Mutable<KibanaRequest>
+): request is Mutable<KibanaRequestWithQueryVersion> {
   return isObject(request.query) && ELASTIC_HTTP_VERSION_QUERY_PARAM in request.query;
 }
 export function removeQueryVersion(request: Mutable<KibanaRequestWithQueryVersion>): void {