fix: handle when there is no overrides in the modpack

src/core/modrinth.ts

@@ -132,7 +132,7 @@ export async function getOverridesChanges(
         overridesList.find(
           (a) =>
             path.relative(overridesPath, path.join(a.parentPath, a.name)) ===
-            relativePath,
+              relativePath,
         )
       ) {
         // overwrite as it may be a different file
@@ -163,10 +163,10 @@ export async function getOverridesChanges(
         !oldOverridesList.find(
           (oldFile) =>
             relativePath ===
-            path.relative(
-              oldOverridesPath,
-              path.join(oldFile.parentPath, oldFile.name),
-            ),
+              path.relative(
+                oldOverridesPath,
+                path.join(oldFile.parentPath, oldFile.name),
+              ),
         )
       ) {
         // new file
@@ -187,10 +187,11 @@ export async function getOverridesChanges(
       addedDirs.push(
         path.relative(overridesPath, path.join(file.parentPath, file.name)),
       );
-    } else
+    } else {
       addedOverrides.push(
         path.relative(overridesPath, path.join(file.parentPath, file.name)),
       );
+    }
   }
 
   return {
@@ -224,10 +225,24 @@ export async function generatePackChanges(
     manifest,
     oldManifest,
   );
-  const overridesChanges = await getOverridesChanges(
-    instanceFolder,
-    tempFolder,
-  );
+
+  let overridesChanges: Awaited<ReturnType<typeof getOverridesChanges>> = {
+    addedDirs: [],
+    addedOverrides: [],
+    removedDirs: [],
+    removedOverrides: [],
+  };
+
+  if (
+    await exists(
+      path.join(tempFolder, "pack", "overrides"),
+    )
+  ) {
+    overridesChanges = await getOverridesChanges(
+      instanceFolder,
+      tempFolder,
+    );
+  }
 
   return { modrinthChanges, overridesChanges };
 }
@@ -241,7 +256,7 @@ export async function ModrinthDownloader(
       concurrency: 5,
     },
     updateSize: true,
-    overwrite: true
+    overwrite: true,
   });
 
   modrinthDownloader.on("completed", () => {

src/launcher/instance.ts

@@ -1,11 +1,11 @@
 import { EventEmitter } from "events";
 import {
   Config,
+  FinalConfig,
   InstanceEvents,
   logger,
-  Version,
-  FinalConfig,
   ModloaderConfig,
+  Version,
 } from "../utils/types";
 import path from "node:path";
 import {
@@ -53,8 +53,8 @@ export function defineConfig(logger: logger, config: Config) {
     instance: config.paths.instance,
     versions: config.paths.versions ?? path.join(config.paths.root, "versions"),
     assets: config.paths.assets ?? path.join(config.paths.root, "assets"),
-    libraries:
-      config.paths.libraries ?? path.join(config.paths.root, "libraries"),
+    libraries: config.paths.libraries ??
+      path.join(config.paths.root, "libraries"),
   };
 
   config.args = {
@@ -267,15 +267,24 @@ export class Instance extends EventEmitter<InstanceEvents> {
 
         // Delete before downloading
 
-        await ProjectsDeleter(modrinthChanges.removedProject, (...args) => this.emit(...args));
+        await ProjectsDeleter(
+          modrinthChanges.removedProject,
+          (...args) => this.emit(...args),
+        );
 
-        await ModrinthDownloader(modrinthChanges.addedProjects, (...args) => this.emit(...args));
+        await ModrinthDownloader(
+          modrinthChanges.addedProjects,
+          (...args) => this.emit(...args),
+        );
 
-        await OverridesDeleter(overridesChanges, (...args) => this.emit(...args));
+        await OverridesDeleter(
+          overridesChanges,
+          (...args) => this.emit(...args),
+        );
 
         await OverridesCopier(
           overridesChanges.addedOverrides,
-          path.join(this.config.modrinth.tempFolder, 'pack', 'overrides'),
+          path.join(this.config.modrinth.tempFolder, "pack", "overrides"),
           this.config.paths.instance,
           (...args) => this.emit(...args),
         );