os-name/index.js

Get the name of the current operating system. Example: macOS Sierra

import fs from 'node:fs';
import os from 'node:os';
import macosRelease from 'macos-release';
import windowsRelease from 'windows-release';

function getLinuxPrettyName() {
	try {
		const osRelease = fs.readFileSync('/etc/os-release', 'utf8');
		const match = osRelease.match(/^PRETTY_NAME=(?:"(.+?)"|'(.+?)'|(.+))$/m);
		const prettyName = match?.[1] ?? match?.[2] ?? match?.[3];
		if (prettyName) {
			return prettyName;
		}
	} catch {}

	return '';
}

export default function osName(platform, release) {
	if (!platform && release) {
		throw new Error('You can\'t specify a `release` without specifying `platform`');
	}

	platform ??= os.platform();

	let id;

	if (platform === 'darwin') {
		if (!release && os.platform() === 'darwin') {
			release = os.release();
		}

		const prefix = release ? (Number(release.split('.')[0]) > 15 ? 'macOS' : 'OS X') : 'macOS';

		try {
			id = release ? macosRelease(release).name : '';

			if (id === 'Unknown') {
				return prefix;
			}
		} catch {}

		return prefix + (id ? ' ' + id : '');
	}

	if (platform === 'linux') {
		if (!release && os.platform() === 'linux') {
			const prettyName = getLinuxPrettyName();
			if (prettyName) {
				return prettyName;
			}

			release = os.release();
		}

		id = release ? release.replace(/^(\d+\.\d+).*/, '$1') : '';
		return 'Linux' + (id ? ' ' + id : '');
	}

	if (platform === 'win32') {
		if (!release && os.platform() === 'win32') {
			release = os.release();
		}

		id = release ? windowsRelease(release) : '';
		return 'Windows' + (id ? ' ' + id : '');
	}

	return platform;
}