fix: fix $ref resolution for metadata-schema

Author: RomanHotsiy

packages/core/src/config/__tests__/config-resolvers.test.ts

@@ -634,4 +634,33 @@ describe('resolveApis', () => {
     });
     expect(resolvedConfig.plugins).toEqual(['test-plugin', 'fixtures/plugin.cjs']);
   });
+
+  it('should work with nested schema', async () => {
+    const { resolvedConfig } = await resolveConfig({
+      rawConfigDocument: makeDocument(
+        {
+          rules: {
+            'metadata-schema': {
+              type: 'object',
+              properties: {
+                'service-domain': {
+                  $ref: 'sd.yaml',
+                },
+              },
+            },
+          },
+        },
+        configPath
+      ),
+    });
+    expect(resolvedConfig?.rules?.['metadata-schema']).toEqual({
+      type: 'object',
+      properties: {
+        'service-domain': {
+          type: 'string',
+          enum: ['api', 'data'],
+        },
+      },
+    });
+  });
 });

packages/core/src/config/__tests__/fixtures/resolve-config/sd.yaml

@@ -0,0 +1,4 @@
+type: string
+enum:
+  - 'api'
+  - 'data'

packages/core/src/types/redocly-yaml.ts

@@ -1,6 +1,6 @@
 import path from 'node:path';
 import { rootRedoclyConfigSchema } from '@redocly/config';
-import { listOf } from './index.js';
+import { listOf, mapOf } from './index.js';
 import { specVersions, getTypes } from '../oas-types.js';
 import { isCustomRuleId, omit } from '../utils.js';
 import { getNodeTypesFromJSONSchema } from './json-schema-adapter.js';
@@ -317,7 +317,9 @@ const ObjectRule: NodeType = {
 
 // TODO: add better type tree for this
 const Schema: NodeType = {
-  properties: {},
+  properties: {
+    properties: mapOf('Schema'),
+  },
   additionalProperties: {},
 };