src/vs/platform/environment/node/argv.ts/formatUsage
function formatUsage(optionId: string, option: Option<any>) {
	let args = '';
	if (option.args) {
		if (Array.isArray(option.args)) {
			args = ` <${option.args.join('> <')}>`;
		} else {
			args = ` <${option.args}>`;
		}
	}
	if (option.alias) {
		return `-${option.alias} --${optionId}${args}`;
	}
	return `--${optionId}${args}`;
}