const Shortcuts = { COPY: 'copy', } const keys = { CTRL_C: 'ctrl+c', COMMAND_C: 'command+c' } function concatKeys(...keys) { return keys.join(', '); } const shortcutKeys = { [Shortcuts.COPY]: concatKeys(Keys.CTRL_C, Keys.COMMAND_C) } const hotkeysManager = { initialize() { createKeyHandlerMap } }