update karma, remove some redundant packages

karma.conf.js

@@ -7,11 +7,9 @@ module.exports = function (config) {
             frameworks: ['jasmine', '@angular-devkit/build-angular'],
             plugins: [
                 require('karma-jasmine'),
-            require('karma-babel-preprocessor'),
+                require('karma-coverage'),
                 require('karma-chrome-launcher'),
-            require('karma-webpack'),
                 require('karma-jasmine-html-reporter'),
-            require('karma-coverage-istanbul-reporter'),
                 require('@angular-devkit/build-angular/plugins/karma'),
             ],
             customLaunchers: {
@@ -28,19 +26,17 @@ module.exports = function (config) {
             client: {
                 clearContext: false
             },
-        files: [
-            
-        ],
+            files: [],
             preprocessors: {},
             mime: {
                 'text/x-typescript': ['ts', 'tsx']
             },
-        coverageIstanbulReporter: {
-            dir: require('path').join(__dirname, 'coverage'), reports: [ 'html', 'lcovonly' ],
-            fixWebpackSourcePaths: true,
-            thresholds: {
-                statements: 30
-            }
+            coverageReporter: {
+                dir: 'coverage',
+                reporters: [
+                    {type: 'html', subdir: '.'},
+                    {type: 'lcovonly', subdir: '.', file: 'lcov.info'},
+                ]
             },
 
             reporters: ['progress'],

package.json

@@ -54,23 +54,18 @@
     "@angular-devkit/build-angular": "~0.1102.13",
     "@angular/cli": "^11.2.13",
     "@angular/compiler-cli": "^11.2.14",
-    "@babel/core": "^7.14.3",
-    "@babel/preset-env": "^7.14.2",
     "@types/jasmine": "~3.6.0",
     "@types/node": "^12.20.13",
-    "babel-preset-env": "^1.7.0",
     "codelyzer": "^6.0.0",
     "intl": "^1.2.5",
     "jasmine-core": "~3.6.0",
     "jasmine-spec-reporter": "~5.0.0",
-    "karma": "~6.3.2",
-    "karma-babel-preprocessor": "^8.0.1",
+    "karma": "^6.3.2",
     "karma-chrome-launcher": "~3.1.0",
     "karma-cli": "^1.0.1",
-    "karma-coverage-istanbul-reporter": "~3.0.2",
+    "karma-coverage": "^2.0.3",
     "karma-jasmine": "~4.0.0",
     "karma-jasmine-html-reporter": "^1.5.0",
-    "karma-remap-istanbul": "^0.6.0",
     "karma-webpack": "^4.0.2",
     "protractor": "~7.0.0",
     "puppeteer": "^1.20.0",