var cp = require('child_process') var fs = require('fs') var path = require('path') /** * Returns the operating system's CPU architecture. This is different than * `process.arch` or `os.arch()` which returns the architecture the Node.js (or * Electron) binary was compiled for. */ module.exports = function arch () { /** * The running binary is 64-bit, so the OS is clearly 64-bit. */ if (process.arch === 'x64') { return 'x64' } /** * All recent versions of Mac OS are 64-bit. */ if (process.platform === 'darwin') { return 'x64' } /** * On Windows, the most reliable way to detect a 64-bit OS from within a 32-bit * app is based on the presence of a WOW64 file: %SystemRoot%\SysNative. * See: https://twitter.com/feross/status/776949077208510464 */ if (process.platform === 'win32') { var useEnv = false try { useEnv = !!(process.env.SYSTEMROOT && fs.statSync(process.env.SYSTEMROOT)) } catch (err) {} var sysRoot = useEnv ? process.env.SYSTEMROOT : 'C:\\Windows' // If %SystemRoot%\SysNative exists, we are in a WOW64 FS Redirected application. var isWOW64 = false try { isWOW64 = !!fs.statSync(path.join(sysRoot, 'sysnative')) } catch (err) {} return isWOW64 ? 'x64' : 'x86' } /** * On Linux, use the `getconf` command to get the architecture. */ if (process.platform === 'linux') { var output = cp.execSync('getconf LONG_BIT', {encoding: 'utf8'}) return output === '64\n' ? 'x64' : 'x86' } /** * If none of the above, assume the architecture is 32-bit. */ return 'x86' }