// Copyright 2021 Signal Messenger, LLC // SPDX-License-Identifier: AGPL-3.0-only { let className: string; if (window.SignalContext.OS.isWindows()) { className = 'os-windows'; } else if (window.SignalContext.OS.isMacOS()) { className = 'os-macos'; } else if (window.SignalContext.OS.isLinux()) { className = 'os-linux'; } else { throw new Error('Unexpected operating system; not applying '); } document.body.classList.add(className); }