[lint] Remove some unused variables

This commit removes unused variables or add underscores to those in need.

ONE-vscode-DCO-1.0-Signed-off-by: Dayoung Lee <[email protected]>

src/CfgEditor/CfgEditorPanel.ts

@@ -174,7 +174,7 @@ export class CfgEditorPanel implements vscode.CustomTextEditorProvider {
       }
     });
 
-    webviewPanel.onDidChangeViewState(e => {
+    webviewPanel.onDidChangeViewState(() => {
       if (webviewPanel.visible) {
         vscode.commands.executeCommand('one.explorer.revealInOneExplorer', document.fileName);
       }

src/Execute/DeviceViewProvider.ts

@@ -21,7 +21,6 @@ import {globalBackendMap} from '../Backend/API';
 import {Command} from '../Backend/Command';
 import {Executor} from '../Backend/Executor';
 import {DeviceSpec, supportedSpecs} from '../Backend/Spec';
-import {Balloon} from '../Utils/Balloon';
 import {Logger} from '../Utils/Logger';
 
 import {Device} from './Device';
@@ -150,7 +149,7 @@ export class DeviceViewProvider implements vscode.TreeDataProvider<DeviceViewNod
   }
 
   private getDevicesPromise(cmd: Command, deviceSpec: DeviceSpec): Promise<Device[]> {
-    return new Promise<Device[]>((resolve, reject) => {
+    return new Promise<Device[]>((resolve) => {
       let result: string = '';
       let error: string = '';
       let cmdSpawn = cp.spawn(cmd.str(), {shell: false});

src/Job/ToolRunner.ts

@@ -20,7 +20,6 @@ import {Logger} from '../Utils/Logger';
 import {pipedSpawn} from '../Utils/PipedSpawn';
 import {ToolArgs} from './ToolArgs';
 
-const path = require('path');
 const which = require('which');
 
 const K_DATA: string = 'data';

src/Jsontracer/JsonTracerViewerPanel.ts

@@ -114,7 +114,7 @@ export class JsonTracerViewerPanel implements vscode.CustomTextEditorProvider {
       }
     });
 
-    webviewPanel.onDidChangeViewState(e => {
+    webviewPanel.onDidChangeViewState(() => {
       vscode.commands.executeCommand(
           'setContext', JsonTracerViewerPanel.viewType, webviewPanel.visible);
     }, null, this._disposables);

src/View/InstallQuickInput.ts

@@ -25,7 +25,7 @@ import {InputStep, MultiStepInput} from '../Utils/MultiStepInput';
 async function shouldResume() {
   // Could show a notification with the option to resume.
   return new Promise<boolean>(
-      (resolve, reject) => {
+      () => {
           // noop
       });
 }
@@ -268,7 +268,7 @@ class InstallQuickInput {
   }
 
   /* istanbul ignore next */
-  public async updateBackend(input: MultiStepInput, state: Partial<InstallQuickInputState>) {
+  public async updateBackend(input: MultiStepInput, _state: Partial<InstallQuickInputState>) {
     if (this.toolchainEnv === undefined || this.toolchainType === undefined) {
       this.error = 'toolchainenv is undefined.';
       throw Error('toolchainenv is undefined.');