diff --git a/src/electron-api.d.ts b/src/electron-api.d.ts
new file mode 100644
index 0000000..3643216
--- /dev/null
+++ b/src/electron-api.d.ts
@@ -0,0 +1,48 @@
+interface DeviceEntry {
+  vendorId: number;
+  productId: number;
+  displayName: string;
+  manufacturer: string;
+  product: string;
+  serialNumber: string;
+}
+
+interface CpuTempResult {
+  main: number;
+  cores: number[];
+  max: number;
+  error?: string;
+}
+
+interface RamResult {
+  total: number;
+  free: number;
+  used: number;
+  usedPercent: string;
+  error?: string;
+}
+
+interface GpuController {
+  vendor: string;
+  model: string;
+  temperatureGpu: number | null;
+  memoryUsed: number | null;
+  memoryTotal: number | null;
+}
+
+interface ElectronAPI {
+  systemCpuTemp: () => Promise<CpuTempResult>;
+  systemRam: () => Promise<RamResult>;
+  systemGpu: () => Promise<GpuController[] | { error: string }>;
+  usbListDevices: () => Promise<DeviceEntry[] | { error: string }>;
+  usbConnect: (vendorId: number, productId: number) => Promise<{ success: boolean } | { error: string }>;
+  prefsGet: (key?: string) => Promise<unknown>;
+  prefsSet: (key: string, value: unknown) => Promise<unknown>;
+  prefsDelete: (key: string) => Promise<unknown>;
+  dialogOpenFile: (options?: unknown) => Promise<{ canceled: boolean; filePaths: string[] }>;
+  dialogSaveFile: (options?: unknown) => Promise<{ canceled: boolean; filePath: string }>;
+}
+
+interface Window {
+  electronAPI: ElectronAPI;
+}