fix(utils): when updating a non-existing nestjs module

Author: micalevisk

src/utils/metadata.manager.ts

@@ -24,14 +24,18 @@ export class MetadataManager {
     metadata: string,
     symbol: string,
     staticOptions?: DeclarationOptions['staticOptions'],
-  ): string {
+  ): string | undefined {
     const source: SourceFile = createSourceFile(
       'filename.ts',
       this.content,
       ScriptTarget.ES2017,
     );
     const decoratorNodes: Node[] = this.getDecoratorMetadata(source, '@Module');
     const node: Node = decoratorNodes[0];
+    // If there is no occurrence of `@Module` decorator, nothing will be inserted
+    if (!node) {
+      return;
+    }
     const matchingProperties: ObjectLiteralElement[] = (
       node as ObjectLiteralExpression
     ).properties

src/utils/module-metadata.declarator.ts

@@ -9,6 +9,6 @@ export class ModuleMetadataDeclarator {
       options.symbol,
       options.staticOptions,
     );
-    return inserted;
+    return inserted ?? content;
   }
 }