style(eslint): fix eslint errors and configuration

eslint typescript prettier configuration has been simplified.

see https://github.com/prettier/eslint-config-prettier/blob/main/CHANGELOG.md#version-800-2021-02-21

.eslintrc.js

@@ -8,8 +8,7 @@ module.exports = {
   extends: [
     'plugin:@typescript-eslint/eslint-recommended',
     'plugin:@typescript-eslint/recommended',
-    'prettier',
-    'prettier/@typescript-eslint',
+    'prettier'
   ],
   root: true,
   env: {

lib/utils/project-utils.ts

@@ -83,7 +83,7 @@ export function moveDefaultProjectToStart(
   defaultProjectName: string,
   defaultLabel: string,
 ) {
-  let projects: string[] = Object.keys(configuration.projects as {});
+  let projects: string[] = configuration.projects != null ? Object.keys(configuration.projects) : [];
   if (configuration.sourceRoot !== 'src') {
     projects = projects.filter(
       (p) => p !== defaultProjectName.replace(defaultLabel, ''),

lib/utils/tree-kill.ts

@@ -27,7 +27,7 @@ function getAllPid(): {
 
   return rows
     .map(function (row) {
-      var parts = row.match(/\s*(\d+)\s*(\d+)/);
+      const parts = row.match(/\s*(\d+)\s*(\d+)/);
 
       if (parts === null) {
         return null;
@@ -38,19 +38,19 @@ function getAllPid(): {
         ppid: Number(parts[2]),
       };
     })
-    .filter(<T extends Object>(input: null | undefined | T): input is T => {
+    .filter(<T>(input: null | undefined | T): input is T => {
       return input != null;
     });
 }
 
 function getAllChilds(pid: number) {
   const allpid = getAllPid();
 
-  let ppidHash: {
+  const ppidHash: {
     [key: number]: number[];
   } = {};
 
-  let result: number[] = [];
+  const result: number[] = [];
 
   allpid.forEach(function (item) {
     ppidHash[item.ppid] = ppidHash[item.ppid] || [];