arduino-ide/arduino-ide-extension/src/electron-common/electron-main-window-service-ext.ts

export const electronMainWindowServiceExtPath = '/services/electron-window-ext';
export const ElectronMainWindowServiceExt = Symbol(
  'ElectronMainWindowServiceExt'
);
export interface ElectronMainWindowServiceExt {
  isFirstWindow(windowId: number): Promise<boolean>;
}