corrections, additional type checks/tests, update version

Author: TheTechsTech

README.md

@@ -112,7 +112,12 @@ import {
   isBlob, // True if value is a Blob, otherwise false.
   isFunction, // True if value is a Function, otherwise false.
   isDate, // True if value is a Date, otherwise false.
-  isStream //True if value is a Stream, otherwise false
+  isStream, // True if value is a Stream, otherwise false.
+  isNull, // True if value is a null, otherwise false.
+  isBool, // True if value is a boolean, otherwise false.
+  isWindows, // True if platform a Windows OS, otherwise false.
+  isLinux, // True if platform a Linux OS, otherwise false.
+  isMac, // True if platform a Apple macOS, otherwise false.
 } from 'node-sys';
 ```
 

index.js

@@ -77,7 +77,7 @@ function sysManager() {
  */
 export const packager = Sys.packager = function () {
   let sys = sysManager();
-  if (Array.isArray(sys) && sys[0])
+  if (isArray(sys) && sys[0])
     return {
       sudo: (sys[0] === 'sudo'),
       command: ((!sys[2]) ? sys[0] : sys[1]),
@@ -105,7 +105,7 @@ export const installer = Sys.installer = function (application, progress) {
     return new Promise((resolve, reject) => { return reject("No package, application name missing."); });
 
   let manager = sysManager();
-  if (!Array.isArray(manager))
+  if (!isArray(manager))
     return new Promise((resolve, reject) => { return reject(manager); });
   let cmd = manager[0];
   let args = null;
@@ -115,7 +115,7 @@ export const installer = Sys.installer = function (application, progress) {
   if (manager[2])
     install = [manager[2]];
 
-  let whatToInstall = (Array.isArray(application)) ? [].concat(application).concat(['-y']) : [].concat([application]).concat(['-y']);
+  let whatToInstall = isArray(application) ? [].concat(application).concat(['-y']) : [].concat([application]).concat(['-y']);
   let system = whatToInstall;
   if ((args) && (!install))
     system = args.concat(whatToInstall);
@@ -209,7 +209,7 @@ export const spawning = Sys.spawning = function (command, argument, progressOpti
 
     if (sudo) {
       argument = [command].concat(argument);
-      command = (process.platform == 'win32') ? join(__dirname, 'bin', 'sudo.bat') : 'sudo';
+      command = (isWindows()) ? join(__dirname, 'bin', 'sudo.bat') : 'sudo';
     };
 
     const spawned = spawn(command, argument, options);
@@ -405,6 +405,53 @@ export const isStream = Sys.isStream = function (value) {
   return isObject(value) && isFunction(value.pipe);
 }
 
+/**
+ * Determine if a value is a boolean
+ *
+ * @param {Object} value The value to test
+ * @returns {boolean} True if value is a boolean, otherwise false
+ */
+export const isBool = Sys.isBool = function (value) {
+  return (value === true) || (value === false);
+}
+
+/**
+ * Determine if a value is a null
+ *
+ * @param {Object} value The value to test
+ * @returns {boolean} True if value is a null, otherwise false
+ */
+export const isNull = Sys.isNull = function (value) {
+  return value === null;
+}
+
+/**
+ * Determine if platform is Windows
+ *
+ * @returns {boolean} True if Windows OS, otherwise false
+ */
+export const isWindows = Sys.isWindows = function () {
+  return process.platform === 'win32';
+}
+
+/**
+ * Determine if platform is Linux
+ *
+ * @returns {boolean} True if Linux OS, otherwise false
+ */
+export const isLinux = Sys.isLinux = function () {
+  return process.platform === 'linux';
+}
+
+/**
+ * Determine if platform is Apple Mac
+ *
+ * @returns {boolean} True if Apple macOS, otherwise false
+ */
+export const isMac = Sys.isMac = function () {
+  return process.platform === 'darwin';
+}
+
 function Sys() { }
 
 export default Sys;

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "node-sys",
-  "version": "1.1.1",
+  "version": "1.1.2",
   "description": "Universal package installer, get the command for managing packages, or auto install any package, using one command for all platforms. Automate the installation of macOS Brew, and Windows Chocolatey package managers. A promisify child process of spawn, run as administrator.",
   "type": "module",
   "main": "index.js",

package.json

@@ -1,5 +1,5 @@
 import chai from 'chai';
-import Sys from '../index.js';
+import Sys, { isLinux, isMac, isWindows } from '../index.js';
 import {
   Readable
 } from 'stream';
@@ -387,7 +387,7 @@ describe('Function: `Sys`', function () {
 
 });
 
-describe('Function: `System` Methods', function () {
+describe('Function: `System` Check Methods', function () {
   it('should instanced itself like a class', function () {
     const system = new System();
     expect(system).to.be.an.instanceof(System);
@@ -406,6 +406,11 @@ describe('Function: `System` Methods', function () {
     expect(System).itself.to.respondTo('isDate');
     expect(System).itself.to.respondTo('isFunction');
     expect(System).itself.to.respondTo('isStream');
+    expect(System).itself.to.respondTo('isNull');
+    expect(System).itself.to.respondTo('isBool');
+    expect(System).itself.to.respondTo('isWindows');
+    expect(System).itself.to.respondTo('isLinux');
+    expect(System).itself.to.respondTo('isMac');
   });
 
   class Blob { };
@@ -487,4 +492,24 @@ describe('Function: `System` Methods', function () {
       foo: 'bar'
     })).to.equal(false);
   });
+
+  it('should validate null', function () {
+    expect(System.isNull(null)).to.equal(true);
+    expect(System.isNull()).to.equal(false);
+    expect(System.isNull(false)).to.equal(false);
+    expect(System.isNull(0)).to.equal(false);
+  });
+
+  it('should validate boolean', function () {
+    expect(System.isBool(true)).to.equal(true);
+    expect(System.isBool(false)).to.equal(true);
+    expect(System.isBool(null)).to.equal(false);
+    expect(System.isBool()).to.equal(false);
+    expect(System.isBool('')).to.equal(false);
+    expect(System.isBool(1)).to.equal(false);
+    expect(System.isBool(0)).to.equal(false);
+    expect(System.isBool(isWindows())).to.equal(true);
+    expect(System.isBool(isLinux())).to.equal(true);
+    expect(System.isBool(isMac())).to.equal(true);
+  });
 });