appium/packages/support/lib/system.ts

import os from 'node:os';

import {exec} from 'teen_process';

const VERSION_PATTERN = /^(\d+\.\d+)/m;

/**
 * Whether the current OS is Windows.
 */
export function isWindows(): boolean {
  return os.type() === 'Windows_NT';
}

/**
 * Whether the current OS is macOS (Darwin).
 */
export function isMac(): boolean {
  return os.type() === 'Darwin';
}

/**
 * Whether the current OS is Linux (i.e. not Windows and not macOS).
 */
export function isLinux(): boolean {
  return !isWindows() && !isMac();
}

/**
 * Whether the current Windows process is 64-bit (or WOW64).
 */
export function isOSWin64(): boolean {
  return process.arch === 'x64' || Object.hasOwn(process.env, 'PROCESSOR_ARCHITEW6432');
}

/**
 * Detects the major.minor macOS version (e.g. "10.12") via `sw_vers -productVersion`.
 *
 * @returns The major.minor version string.
 * @throws {Error} If `sw_vers` fails or output cannot be parsed.
 */
export async function macOsxVersion(): Promise<string> {
  let stdout: string;
  try {
    stdout = (await exec('sw_vers', ['-productVersion'])).stdout.trim();
  } catch (err) {
    throw new Error(`Could not detect Mac OS X Version: ${err}`, {cause: err});
  }

  const versionMatch = VERSION_PATTERN.exec(stdout);
  if (!versionMatch) {
    throw new Error(`Could not detect Mac OS X Version from sw_vers output: '${stdout}'`);
  }
  return versionMatch[1];
}

/**
 * System detection helpers (platform, architecture, macOS version).
 * Use this object when you need `arch()` to call other helpers via `this` (e.g. for testing).
 */
export const system: System = {
  isWindows,
  isMac,
  isLinux,
  isOSWin64,
  arch: archImpl,
  macOsxVersion,
};

/**
 * Resolves the process architecture as `'32'` or `'64'` (uname on Unix, process.arch/env on Windows).
 */
export const arch = system.arch;

// #region Private

interface System {
  isWindows(): boolean;
  isMac(): boolean;
  isLinux(): boolean;
  isOSWin64(): boolean;
  arch(): Promise<string>;
  macOsxVersion(): Promise<string>;
}

async function archImpl(this: System): Promise<string> {
  if (this.isLinux() || this.isMac()) {
    const {stdout} = await exec('uname', ['-m']);
    return stdout.trim() === 'i686' ? '32' : '64';
  } else if (this.isWindows()) {
    return this.isOSWin64() ? '64' : '32';
  }
  return '64';
}

// #endregion