refactor(infra): directory structure (#4615)

packages/frontend/electron/vitest.config.ts

@@ -0,0 +1,34 @@
+import { resolve } from 'node:path';
+import { fileURLToPath } from 'node:url';
+
+import { defineConfig } from 'vitest/config';
+
+const rootDir = fileURLToPath(new URL('../../..', import.meta.url));
+const pluginOutputDir = resolve(
+  rootDir,
+  './packages/frontend/electron/dist/plugins'
+);
+
+export default defineConfig({
+  resolve: {
+    alias: {
+      // prevent tests using two different sources of yjs
+      yjs: resolve(rootDir, 'node_modules/yjs'),
+    },
+  },
+  define: {
+    'process.env.PLUGIN_DIR': JSON.stringify(pluginOutputDir),
+  },
+  test: {
+    include: ['./src/**/*.spec.ts'],
+    exclude: ['**/node_modules', '**/dist', '**/build', '**/out'],
+    testTimeout: 5000,
+    singleThread: true,
+    threads: false,
+    coverage: {
+      provider: 'istanbul', // or 'c8'
+      reporter: ['lcov'],
+      reportsDirectory: resolve(rootDir, '.coverage/electron'),
+    },
+  },
+});