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+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'
+}