diff --git a/lib/audio.js b/lib/audio.js
index f424b54..f6a1353 100644
--- a/lib/audio.js
+++ b/lib/audio.js
@@ -17,7 +17,7 @@ const exec = require('child_process').exec;
 const execSync = require('child_process').execSync;
 const util = require('./util');
 
-let _platform = process.platform;
+const _platform = process.platform;
 
 const _linux = _platform === 'linux' || _platform === 'android';
 const _darwin = _platform === 'darwin';
@@ -83,8 +83,8 @@ function parseAudioType(str, input, output) {
 }
 
 function getLinuxAudioPci() {
-  let cmd = 'lspci -v 2>/dev/null';
-  let result = [];
+  const cmd = 'lspci -v 2>/dev/null';
+  const result = [];
   try {
     const parts = execSync(cmd, util.execOptsLinux).toString().split('\n\n');
     parts.forEach((element) => {
@@ -97,7 +97,7 @@ function getLinuxAudioPci() {
       }
     });
     return result;
-  } catch (e) {
+  } catch {
     return result;
   }
 }
@@ -239,7 +239,7 @@ function audio(callback) {
                   result.push(audio);
                 }
               }
-            } catch (e) {
+            } catch {
               util.noop();
             }
           }
diff --git a/lib/bluetooth.js b/lib/bluetooth.js
index 569951c..ede3541 100644
--- a/lib/bluetooth.js
+++ b/lib/bluetooth.js
@@ -20,7 +20,7 @@ const util = require('./util');
 const bluetoothVendors = require('./bluetoothVendors');
 const fs = require('fs');
 
-let _platform = process.platform;
+const _platform = process.platform;
 
 const _linux = _platform === 'linux' || _platform === 'android';
 const _darwin = _platform === 'darwin';
@@ -187,7 +187,7 @@ function bluetoothDevices(callback) {
               result[i].connected = true;
             }
           }
-        } catch (e) {
+        } catch {
           util.noop();
         }
 
diff --git a/lib/docker.js b/lib/docker.js
index 1db4ed0..cf8a92c 100644
--- a/lib/docker.js
+++ b/lib/docker.js
@@ -16,10 +16,10 @@
 const util = require('./util');
 const DockerSocket = require('./dockerSocket');
 
-let _platform = process.platform;
+const _platform = process.platform;
 const _windows = _platform === 'win32';
 
-let _docker_container_stats = {};
+const _docker_container_stats = {};
 let _docker_socket;
 let _docker_last_read = 0;
 
@@ -119,7 +119,7 @@ function dockerImages(all, callback) {
         try {
           dockerImages = data;
           if (dockerImages && Object.prototype.toString.call(dockerImages) === '[object Array]' && dockerImages.length > 0) {
-            dockerImages.forEach(function (element) {
+            dockerImages.forEach((element) => {
               if (element.Names && Object.prototype.toString.call(element.Names) === '[object Array]' && element.Names.length > 0) {
                 element.Name = element.Names[0].replace(/^\/|\/$/g, '');
               }
@@ -144,7 +144,7 @@ function dockerImages(all, callback) {
             }
             resolve(result);
           }
-        } catch (err) {
+        } catch {
           if (callback) {
             callback(result);
           }
@@ -193,7 +193,7 @@ function dockerImagesInspect(imageID, payload) {
               config: data.Config ? data.Config : {},
               rootFS: data.RootFS ? data.RootFS : {}
             });
-          } catch (err) {
+          } catch {
             resolve();
           }
         });
@@ -208,7 +208,7 @@ exports.dockerImages = dockerImages;
 
 function dockerContainers(all, callback) {
   function inContainers(containers, id) {
-    let filtered = containers.filter((obj) => {
+    const filtered = containers.filter((obj) => {
       /**
        * @namespace
        * @property {string}  Id
@@ -253,7 +253,7 @@ function dockerContainers(all, callback) {
               }
             }
 
-            docker_containers.forEach(function (element) {
+            docker_containers.forEach((element) => {
               if (element.Names && Object.prototype.toString.call(element.Names) === '[object Array]' && element.Names.length > 0) {
                 element.Name = element.Names[0].replace(/^\/|\/$/g, '');
               }
@@ -336,7 +336,7 @@ function dockerContainerInspect(containerID, payload) {
               // hostconfig: payload.HostConfig,
               // network: payload.NetworkSettings
             });
-          } catch (err) {
+          } catch {
             resolve();
           }
         });
@@ -408,7 +408,7 @@ function docker_calcNetworkIO(networks) {
      * @property {number}  rx_bytes
      * @property {number}  tx_bytes
      */
-    let obj = networks[key];
+    const obj = networks[key];
     rx = +obj.rx_bytes;
     wx = +obj.tx_bytes;
   }
@@ -434,7 +434,7 @@ function docker_calcBlockIO(blkio_stats) {
     Object.prototype.toString.call(blkio_stats.io_service_bytes_recursive) === '[object Array]' &&
     blkio_stats.io_service_bytes_recursive.length > 0
   ) {
-    blkio_stats.io_service_bytes_recursive.forEach(function (element) {
+    blkio_stats.io_service_bytes_recursive.forEach((element) => {
       /**
        * @namespace
        * @property {string}  op
@@ -552,7 +552,7 @@ function dockerContainerStats(containerIDs, callback) {
 
 function dockerContainerStatsSingle(containerID) {
   containerID = containerID || '';
-  let result = {
+  const result = {
     id: containerID,
     memUsage: 0,
     memLimit: 0,
@@ -606,13 +606,13 @@ function dockerContainerStatsSingle(containerID) {
                   result.memoryStats = stats.memory_stats ? stats.memory_stats : {};
                   result.networks = stats.networks ? stats.networks : {};
                 }
-              } catch (err) {
+              } catch {
                 util.noop();
               }
               // }
               resolve(result);
             });
-          } catch (err) {
+          } catch {
             util.noop();
           }
         });
@@ -688,7 +688,7 @@ function dockerContainerProcesses(containerID, callback) {
                 });
               });
             }
-          } catch (err) {
+          } catch {
             util.noop();
           }
           if (callback) {
@@ -720,7 +720,7 @@ function dockerVolumes(callback) {
         try {
           dockerVolumes = data;
           if (dockerVolumes && dockerVolumes.Volumes && Object.prototype.toString.call(dockerVolumes.Volumes) === '[object Array]' && dockerVolumes.Volumes.length > 0) {
-            dockerVolumes.Volumes.forEach(function (element) {
+            dockerVolumes.Volumes.forEach((element) => {
               result.push({
                 name: element.Name,
                 driver: element.Driver,
@@ -741,7 +741,7 @@ function dockerVolumes(callback) {
             }
             resolve(result);
           }
-        } catch (err) {
+        } catch {
           if (callback) {
             callback(result);
           }
@@ -760,7 +760,7 @@ function dockerAll(callback) {
       dockerContainers(true).then((result) => {
         if (result && Object.prototype.toString.call(result) === '[object Array]' && result.length > 0) {
           let l = result.length;
-          result.forEach(function (element) {
+          result.forEach((element) => {
             dockerContainerStats(element.id).then((res) => {
               // include stats in array
               element.memUsage = res[0].memUsage;
diff --git a/lib/filesystem.js b/lib/filesystem.js
index 0677f2c..add2382 100644
--- a/lib/filesystem.js
+++ b/lib/filesystem.js
@@ -701,8 +701,6 @@ function blockDevices(callback) {
       if (_windows) {
         const drivetypes = ['Unknown', 'NoRoot', 'Removable', 'Local', 'Network', 'CD/DVD', 'RAM'];
         try {
-          // util.wmic('logicaldisk get Caption,Description,DeviceID,DriveType,FileSystem,FreeSpace,Name,Size,VolumeName,VolumeSerialNumber /value').then((stdout, error) => {
-          // util.powerShell('Get-CimInstance Win32_logicaldisk | select Caption,DriveType,Name,FileSystem,Size,VolumeSerialNumber,VolumeName | fl').then((stdout, error) => {
           const workload = [];
           workload.push(util.powerShell('Get-CimInstance -ClassName Win32_LogicalDisk | select Caption,DriveType,Name,FileSystem,Size,VolumeSerialNumber,VolumeName | fl'));
           workload.push(
diff --git a/lib/util.js b/lib/util.js
index 2f52ea6..d9acefe 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -21,7 +21,7 @@ const exec = require('child_process').exec;
 const execSync = require('child_process').execSync;
 const util = require('util');
 
-let _platform = process.platform;
+const _platform = process.platform;
 const _linux = _platform === 'linux' || _platform === 'android';
 const _darwin = _platform === 'darwin';
 const _windows = _platform === 'win32';
@@ -30,7 +30,6 @@ const _openbsd = _platform === 'openbsd';
 const _netbsd = _platform === 'netbsd';
 
 let _cores = 0;
-let wmicPath = '';
 let codepage = '';
 let _smartMonToolsInstalled = null;
 let _rpi_cpuinfo = null;
@@ -40,7 +39,7 @@ const WINDIR = process.env.WINDIR || 'C:\\Windows';
 // powerShell
 let _psChild;
 let _psResult = '';
-let _psCmds = [];
+const _psCmds = [];
 let _psPersistent = false;
 let _powerShell = '';
 const _psToUTF8 = '$OutputEncoding = [System.Console]::OutputEncoding = [System.Console]::InputEncoding = [System.Text.Encoding]::UTF8 ; ';
@@ -364,39 +363,6 @@ function getPowershell() {
   }
 }
 
-function getWmic() {
-  if (os.type() === 'Windows_NT' && !wmicPath) {
-    wmicPath = WINDIR + '\\system32\\wbem\\wmic.exe';
-    if (!fs.existsSync(wmicPath)) {
-      try {
-        const wmicPathArray = execSync('WHERE WMIC', execOptsWin).toString().split('\r\n');
-        if (wmicPathArray && wmicPathArray.length) {
-          wmicPath = wmicPathArray[0];
-        } else {
-          wmicPath = 'wmic';
-        }
-      } catch {
-        wmicPath = 'wmic';
-      }
-    }
-  }
-  return wmicPath;
-}
-
-function wmic(command) {
-  return new Promise((resolve) => {
-    process.nextTick(() => {
-      try {
-        powerShell(getWmic() + ' ' + command).then((stdout) => {
-          resolve(stdout, '');
-        });
-      } catch (e) {
-        resolve('', e);
-      }
-    });
-  });
-}
-
 function getVboxmanage() {
   return _windows ? `"${process.env.VBOX_INSTALL_PATH || process.env.VBOX_MSI_INSTALL_PATH}\\VBoxManage.exe"` : 'vboxmanage';
 }
@@ -2673,8 +2639,6 @@ exports.decodeEscapeSequence = decodeEscapeSequence;
 exports.parseDateTime = parseDateTime;
 exports.parseHead = parseHead;
 exports.findObjectByKey = findObjectByKey;
-exports.getWmic = getWmic;
-exports.wmic = wmic;
 exports.darwinXcodeExists = darwinXcodeExists;
 exports.getVboxmanage = getVboxmanage;
 exports.powerShell = powerShell;