cpu() Apple Silicon M1 cores

lib/cpu.js

@@ -15,6 +15,7 @@
 
 const os = require('os');
 const exec = require('child_process').exec;
+const execSync = require('child_process').execSync;
 const fs = require('fs');
 const util = require('./util');
 
@@ -432,7 +433,12 @@ function getCpu() {
           const countCores = util.getValue(lines, 'hw.physicalcpu_max');
           const countThreads = util.getValue(lines, 'hw.ncpu');
           if (os.arch === 'arm64') {
+            const clusters = execSync('ioreg -c IOPlatformDevice -d 3 -r | grep cluster-type').toString().split('\n');
+            const efficiencyCores = clusters.filter(line => line.indexOf('"E"') >= 0).length;
+            const performanceCores = clusters.filter(line => line.indexOf('"P"') >= 0).length;
             result.socket = 'SOC';
+            result.efficiencyCores = efficiencyCores;
+            result.performanceCores = performanceCores;
           }
           if (countProcessors) {
             result.processors = parseInt(countProcessors) || 1;

lib/index.d.ts

@@ -73,6 +73,8 @@ export namespace Systeminformation {
     governor: string;
     cores: number;
     physicalCores: number;
+    efficiencyCores?: number;
+    performanceCores?: number;
     processors: number;
     socket: string;
     cache: CpuCacheData;