fix(reference): unwrap result after dereferencing

Refs #476

Author: char0n

apidom/packages/apidom-reference/src/dereference/index.ts

@@ -51,7 +51,8 @@ export const dereferenceApiDOM = async <T extends Element>(
 
   try {
     const { result } = await plugins.run('dereference', [file, options], dereferenceStrategies);
-    return result;
+    // @ts-ignore
+    return parseResult === element ? result : result.result; // unwrap the element from ParseResult
   } catch (error) {
     throw new DereferenceError(`Error while dereferencing file "${file.uri}"`, error);
   }

apidom/packages/apidom-reference/test/dereference/index.ts

@@ -51,7 +51,7 @@ describe('dereference', function () {
             resolve: { baseURI: rootFilePath },
           });
 
-          assert.deepEqual(toValue(actual), expected);
+          assert.deepEqual(toValue(actual), expected[0]);
         });
       });
     });