Fix another packages mode bug

CHANGELOG.md

@@ -12,6 +12,7 @@
 -   Fixed relative link detection for markdown links containing code in their label, #2606.
 -   Fixed an issue with packages mode where TypeDoc would use (much) more memory than required, #2607.
 -   TypeDoc will no longer crash when asked to render highlighted code for an unsupported language, #2609.
+-   Fixed an issue where relatively-linked files would not be copied to the output directory in packages mode.
 -   `.jsonc` configuration files are now properly read as JSONC, rather than being passed to `require`.
 
 ### Thanks!

src/lib/models/reflections/declaration.ts

@@ -318,6 +318,7 @@ export class DeclarationReflection extends ContainerReflection {
         if (obj.variant === "project") {
             this.kind = ReflectionKind.Module;
             this.packageVersion = obj.packageVersion;
+            this.project.files.fromObject(de, obj.files || {});
 
             de.defer(() => {
                 for (const [id, sid] of Object.entries(obj.symbolIdMap || {})) {

src/lib/models/reflections/project.ts

@@ -400,7 +400,7 @@ export class ProjectReflection extends ContainerReflection {
         if (obj.readme) {
             this.readme = Comment.deserializeDisplayParts(de, obj.readme);
         }
-        this.files.fromObject(de, obj.files);
+        this.files.fromObject(de, obj.files || {});
 
         de.defer(() => {
             // Unnecessary conditional in release