bump vue-cli config to 4

Author: gengjiawen

.eslintrc.js

@@ -5,7 +5,7 @@ module.exports = {
   },
   extends: ["plugin:vue/essential", "@vue/prettier"],
   rules: {
-    "no-console": process.env.NODE_ENV === "production" ? "error" : "off",
+    "no-console": process.env.NODE_ENV === "production" ? "warn" : "off",
     "no-debugger": process.env.NODE_ENV === "production" ? "error" : "off"
   },
   parserOptions: {

babel.config.js

@@ -1,3 +1,3 @@
 module.exports = {
-  presets: ['@vue/app'],
-}
+  presets: ["@vue/cli-plugin-babel/preset"]
+};

jest.config.js

@@ -1,22 +1,3 @@
 module.exports = {
-  moduleFileExtensions: ['js', 'jsx', 'json', 'vue'],
-  transform: {
-    '^.+\\.vue$': 'vue-jest',
-    '.+\\.(css|styl|less|sass|scss|svg|png|jpg|ttf|woff|woff2)$':
-      'jest-transform-stub',
-    '^.+\\.jsx?$': 'babel-jest',
-  },
-  transformIgnorePatterns: ['/node_modules/'],
-  moduleNameMapper: {
-    '^@/(.*)$': '<rootDir>/src/$1',
-  },
-  snapshotSerializers: ['jest-serializer-vue'],
-  testMatch: [
-    '**/tests/unit/**/*.spec.(js|jsx|ts|tsx)|**/__tests__/*.(js|jsx|ts|tsx)',
-  ],
-  testURL: 'http://localhost/',
-  watchPlugins: [
-    'jest-watch-typeahead/filename',
-    'jest-watch-typeahead/testname',
-  ],
-}
+  preset: "@vue/cli-plugin-unit-jest"
+};

package.json

@@ -22,7 +22,7 @@
     "electron-context-menu": "0.15.1",
     "electron-updater": "4.2.0",
     "element-ui": "2.12.0",
-    "core-js": "2.6.10",
+    "core-js": "3.4.0",
     "vue": "2.6.10",
     "vue-router": "3.1.3"
   },
@@ -34,9 +34,6 @@
     "@vue/cli-service": "^4.0.5",
     "@vue/eslint-config-prettier": "^5.0.0",
     "@vue/test-utils": "1.0.0-beta.29",
-    "babel-core": "7.0.0-bridge.0",
-    "babel-eslint": "^10.0.3",
-    "babel-jest": "^24.9.0",
     "electron": "7.1.1",
     "eslint": "6.6.0",
     "eslint-plugin-prettier": "^3.1.1",