Update API tests to mock file system paths for migration handling and change Vite configuration to target Node 20 for improved compatibility.

packages/api/methods.test.ts

@@ -1,10 +1,29 @@
 import * as fs from 'fs/promises';
 import * as path from 'path';
 
+import { vi } from 'vitest';
+
 import type { RuleEntity } from 'loot-core/types/models';
 
 import * as api from './index';
 
+// In tests we run from source; loot-core's API fs uses __dirname (for the built dist/).
+// Mock the fs so path constants point at loot-core package root where migrations live.
+vi.mock(
+  '../loot-core/src/platform/server/fs/index.api',
+  async importOriginal => {
+    const actual = (await importOriginal()) as Record<string, unknown>;
+    const pathMod = await import('path');
+    const lootCoreRoot = pathMod.join(__dirname, '..', 'loot-core');
+    return {
+      ...actual,
+      migrationsPath: pathMod.join(lootCoreRoot, 'migrations'),
+      bundledDatabasePath: pathMod.join(lootCoreRoot, 'default-db.sqlite'),
+      demoBudgetPath: pathMod.join(lootCoreRoot, 'demo-budget'),
+    };
+  },
+);
+
 const budgetName = 'test-budget';
 
 global.IS_TESTING = true;

packages/api/vite.config.ts

@@ -58,7 +58,7 @@ export default defineConfig({
   ssr: { noExternal: true, external: ['better-sqlite3'] },
   build: {
     ssr: true,
-    target: 'node18',
+    target: 'node20',
     outDir: distDir,
     emptyOutDir: true,
     sourcemap: true,