Cater for runtime Metadata_* v2

packages/types/src/interfaces/metadata/runtime.ts

@@ -1,19 +1,43 @@
 // Copyright 2017-2023 @polkadot/types authors & contributors
 // SPDX-License-Identifier: Apache-2.0
 
-import type { DefinitionsCall } from '../../types/index.js';
+import type { DefinitionsCall, DefinitionsCallEntry } from '../../types/index.js';
+
+import { objectSpread } from '@polkadot/util';
+
+const META_V1_TO_V2: DefinitionsCallEntry['methods'] = {
+  metadata: {
+    description: 'Returns the metadata of a runtime',
+    params: [],
+    type: 'OpaqueMetadata'
+  }
+};
 
 export const runtime: DefinitionsCall = {
   Metadata: [
     {
-      methods: {
-        metadata: {
-          description: 'Returns the metadata of a runtime',
+      methods: objectSpread({}, META_V1_TO_V2),
+      version: 1
+    },
+    {
+      methods: objectSpread({
+        metadata_at_version: {
+          description: 'Returns the metadata at a given version.',
+          params: [
+            {
+              name: 'version',
+              type: 'u32'
+            }
+          ],
+          type: 'Option<OpaqueMetadata>'
+        },
+        metadata_versions: {
+          description: 'Returns the supported metadata versions.',
           params: [],
-          type: 'OpaqueMetadata'
+          type: 'Vec<u32>'
         }
-      },
-      version: 1
+      }, META_V1_TO_V2),
+      version: 2
     }
   ]
 };