fix: referenced header name is empty

Author: RomanHotsiy

src/services/__tests__/fixtures/fields.json

@@ -0,0 +1,24 @@
+{
+  "openapi": "3.0.0",
+  "info": {
+    "version": "1.0",
+    "title": "Foo"
+  },
+  "components": {
+    "parameters": {
+      "testParam": {
+        "in": "path",
+        "name": "test_name",
+        "schema": { "type": "string" }
+      }
+    },
+    "headers": {
+      "testHeader": {
+        "description": "The response content language",
+        "schema": {
+          "type": "string"
+        }
+      }
+    }
+  }
+}

src/services/__tests__/models/FieldModel.test.ts

@@ -0,0 +1,43 @@
+import { FieldModel } from '../../models/Field';
+import { OpenAPIParser } from '../../OpenAPIParser';
+import { RedocNormalizedOptions } from '../../RedocNormalizedOptions';
+
+const opts = new RedocNormalizedOptions({});
+
+describe('Models', () => {
+  describe('FieldModel', () => {
+    let parser;
+    const spec = require('../fixtures/fields.json');
+    parser = new OpenAPIParser(spec, undefined, opts);
+
+    test('basic field details', () => {
+      const field = new FieldModel(
+        parser,
+        {
+          $ref: '#/components/parameters/testParam',
+        },
+        '#/components/parameters/testParam',
+        opts,
+      );
+
+      expect(field.name).toEqual('test_name');
+      expect(field.in).toEqual('path');
+      expect(field.required).toEqual(false);
+      expect(field.schema.type).toEqual('string');
+    });
+
+    test('field name should populated from name even if $ref (headers)', () => {
+      const field = new FieldModel(
+        parser,
+        {
+          $ref: '#/components/headers/testHeader',
+          name: 'Test-Header',
+        },
+        '#/components/headers/testHeader',
+        opts,
+      );
+
+      expect(field.name).toEqual('Test-Header');
+    });
+  });
+});

src/services/models/Field.ts

@@ -22,13 +22,12 @@ export class FieldModel {
 
   constructor(
     parser: OpenAPIParser,
-    infoOrRef: Referenced<OpenAPIParameter>,
+    infoOrRef: Referenced<OpenAPIParameter> & { name?: string },
     pointer: string,
     options: RedocNormalizedOptions,
   ) {
-    const info = parser.deref(infoOrRef);
-
-    this.name = info.name;
+    const info = parser.deref<OpenAPIParameter>(infoOrRef);
+    this.name = infoOrRef.name || info.name;
     this.in = info.in;
     this.required = !!info.required;
     const schemaPointer = (parser.isRef(infoOrRef) ? infoOrRef.$ref : pointer) + '/schema';