Per https://www.electron.build/icons, a single 512x512 icon.png placed in the buildResources directory (default `build`) is enough to generate icons for all three - macOS, Windows and Linux.
Per https://www.electron.build/icons, a single 512x512 icon.png placed in the buildResources directory (default `build`) is enough to generate icons for all three - macOS, Windows and Linux.