Angular 10 - CommonJS or AMD dependencies can cause optimization bailouts warning

问题描述：
这几天升级公司的一个Angular项目，把Angular更新到最新的10.0.1版本。

{
    "dependencies": {
    "@angular/animations": "^10.0.1",
    "@angular/cdk": "^10.0.1",
    "@angular/common": "~10.0.1",
    "@angular/compiler": "~10.0.1",
    "@angular/core": "~10.0.1",
    "@angular/forms": "~10.0.1",
    "@angular/material": "^10.0.1",
    "@angular/platform-browser": "~10.0.1",
    "@angular/platform-browser-dynamic": "~10.0.1",
    "@angular/router": "~10.0.1",
    "@feathersjs/authentication-client": "^4.4.3",
    "@feathersjs/client": "^4.4.3",
    "@feathersjs/feathers": "^4.4.3",
    "@feathersjs/rest-client": "^4.4.3",
    "@feathersjs/socketio-client": "^4.4.3",
    "@handsontable/angular": "^2.0.0",
    "@ngtools/webpack": "^10.0.0",
    "@types/socket.io-client": "^1.4.33",
    "angular2-qrcode": "^2.0.3",
    "angularx-flatpickr": "^6.3.1",
    "bootstrap": "^4.5.0",
    "core-js": "^3.6.5",
    "echarts": "^4.8.0",
    "file-saver": "^2.0.2",
    "flatpickr": "^4.6.3",
    "hammerjs": "^2.0.8",
    "handsontable": "6.2.2",
    "jquery": "^3.5.1",
    "mobx": "^5.15.4",
    "mobx-angular": "^4.1.0",
    "moment": "^2.27.0",
    "ng2-dnd": "^5.0.2",
    "ng2-file-upload": "^1.4.0",
    "ng2-flatpickr": "^9.0.0",
    "ngx-bootstrap": "^5.6.1",
    "ngx-echarts": "^5.0.0",
    "ngx-mat-select-search": "^3.0.0",
    "ngx-perfect-scrollbar": "^9.0.0",
    "rxjs": "~6.5.5",
    "sweetalert2": "^9.15.2",
    "trumbowyg": "^2.21.0",
    "tslib": "^2.0.0",
    "xlsx": "^0.16.3",
    "zone.js": "~0.10.3"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.1000.0",
    "@angular-devkit/core": "^10.0.0",
    "@angular/cli": "~10.0.0",
    "@angular/compiler-cli": "~10.0.1",
    "@angular/language-service": "~10.0.1",
    "@angularclass/hmr": "^2.1.3",
    "@types/jasmine": "~3.5.11",
    "@types/jasminewd2": "~2.0.8",
    "@types/node": "~14.0.14",
    "codelyzer": "^5.2.2",
    "jasmine-core": "~3.5.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.1.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.1",
    "karma-jasmine": "~2.0.1",
    "karma-jasmine-html-reporter": "^1.4.0",
    "protractor": "~7.0.0",
    "ts-node": "~8.10.2",
    "tslint": "~6.1.2",
    "typescript": "~3.9.5"
  }
}

升级运行后，一直看到这个警告。

WARNING in XXX.ts depends on moment/locale/zh-cn. CommonJS or AMD dependencies can cause optimization bailouts.
For more info see: https://angular.io/guide/build#configuring-commonjs-dependencies

解决办法：

配置 CommonJS 依赖项

建议你在 Angular 应用中避免依赖 CommonJS 模块。对 CommonJS 模块的依赖会阻止打包器和压缩器优化你的应用，这会导致更大的打包尺寸。 建议你在整个应用中都使用 ECMAScript 模块。 欲知详情，参见为什么 CommonJS 会导致更大的打包尺寸。

如果 Angular CLI 检测到你的浏览器端应用依赖了 CommonJS 模块，就会发出警告。 要禁用这些警告，可以把这些 CommonJS 模块的名字添加到 angular.json 文件的 build 区的 allowedCommonJsDependencies 选项中。

"build": {
  "builder": "@angular-devkit/build-angular:browser",
  "options": {
     "allowedCommonJsDependencies": [
        "lodash"
     ]
     ...
   }
   ...
},

修改如下：

"projects": {
  "project-name": {
    ...
    "architect": {
      "build": {
        "builder": "@angular-devkit/build-angular:browser",
        "options": {
          ...
          "allowedCommonJsDependencies": [
            "@angularclass/hmr",
            "moment",
            "moment/locale/zh-cn",
            "jquery",
            "handsontable",
            "@feathersjs/socketio-client",
            "@feathersjs/rest-client",
            "@feathersjs/feathers",
            "@feathersjs/authentication-client",
            "socket.io-client",
            "xlsx",
            "rxjs",
            "pikaday",
            "ng2-flatpickr"
          ],
          ...
        },
      },
    }
  }
},

再次运行就不包警告啦。

参考：angular-10-commonjs-or-amd-dependencies-can-cause-optimization-bailouts