如果你使用syncfusion "17.4.51“进行了--优化，我会遇到一个奇怪的构建问题

Question

我在一个升级到angular 9的angular项目中使用Syncfusion "17.4.51“时遇到了问题。如果我在优化设置为true的情况下构建，我会得到以下奇怪的错误：

ng serve -c=dev
****************************************************************************************
This is a simple server for use in testing or debugging Angular applications locally.
It hasn't been reviewed for security issues.

DON'T USE IT FOR PRODUCTION!
****************************************************************************************

chunk {} runtime.js, runtime.js.map (runtime) 1.49 kB [entry] [rendered]
chunk {1} main.js, main.js.map (main) 452 bytes [initial] [rendered]
chunk {2} polyfills.js, polyfills.js.map (polyfills) 168 bytes [initial] [rendered]
chunk {3} styles.js, styles.js.map (styles) 3.61 MB [initial] [rendered]
chunk {4} vendor.js, vendor.js.map (vendor) 146 kB [initial] [rendered]
Date: 2020-03-06T11:05:12.264Z - Hash: 7ef4d1671de0c1866c3f - Time: 13120ms

ERROR in Cannot read property 'trim' of undefined
** Angular Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **

这是我的angular.json的一段摘录

"qa": {
          "budgets": [
            {
              "type": "anyComponentStyle",
              "maximumWarning": "6kb"
            }
          ],
          "optimization": true,
          "outputHashing": "all",
          "sourceMap": false,
          "extractCss": false,
          "namedChunks": false,
          "aot": true,
          "extractLicenses": true,
          "vendorChunk": false,
          "buildOptimizer": true,
          "fileReplacements": [
            {
              "replace": "src/environments/environment.ts",
              "with": "src/environments/environment.qa.ts"
            }
          ]
        },

如果我关闭优化，它就可以工作，但我不确定这是否是我想要的，因为它曾经在angular 8上构建得很好。我最初认为这是因为我提前编译了，但似乎不是这样。

有没有人知道我错过了什么，或者syncfusion只是不能与优化一起工作？

这也是我的package.json：

{
  "name": "angular-template",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e",
    "postinstall": "ngcc --properties es2015 browser module main --first-only --create-ivy-entry-points"
  },
  "private": true,
  "dependencies": {
    "@agm/core": "^1.1.0",
    "@angular/animations": "^9.0.5",
    "@angular/cdk": "^9.0.1",
    "@angular/common": "9.0.5",
    "@angular/compiler": "^9.0.5",
    "@angular/core": "9.0.5",
    "@angular/flex-layout": "^9.0.0-beta.29",
    "@angular/forms": "^9.0.5",
    "@angular/localize": "^9.0.5",
    "@angular/material": "^9.0.1",
    "@angular/platform-browser": "^9.0.5",
    "@angular/platform-browser-dynamic": "^9.0.5",
    "@angular/router": "^9.0.5",
    "@ng-bootstrap/ng-bootstrap": "^5.1.5",
    "@ngtools/webpack": "^1.2.4",
    "@syncfusion/ej2-angular-base": "^17.4.51",
    "@syncfusion/ej2-angular-buttons": "^17.4.51",
    "@syncfusion/ej2-angular-grids": "^17.4.51",
    "@syncfusion/ej2-angular-pivotview": "17.4.51",
    "@types/file-saver": "2.0.1",
    "@types/lodash": "^4.14.149",
    "angular-calendar": "^0.28.2",
    "bootstrap": "^3.4.1",
    "classlist.js": "^1.1.20150312",
    "core-js": "^3.6.4",
    "date-fns": "^2.9.0",
    "file-saver": "^2.0.2",
    "google-maps": "^4.2.3",
    "intl": "^1.2.5",
    "lodash": "^4.17.15",
    "mdn-polyfills": "^5.19.0",
    "ng-multiselect-dropdown": "^0.2.10",
    "ng2-ckeditor": "^1.2.6",
    "ng2-dragula": "^2.1.1",
    "ng4-click-outside": "^1.0.1",
    "ngx-bootstrap": "^5.3.2",
    "raven-js": "^3.27.2",
    "rxjs": "^6.5.4",
    "rxjs-compat": "^6.5.4",
    "tslib": "^1.10.0",
    "web-animations-js": "^2.3.2",
    "zone.js": "~0.10.2"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.900.5",
    "@angular/cli": "^9.0.5",
    "@angular/compiler-cli": "^9.0.5",
    "@types/googlemaps": "^3.39.2",
    "@types/jasmine": "^3.5.0",
    "@types/node": "^12.11.1",
    "codelyzer": "^5.1.2",
    "jasmine-core": "~3.5.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.4.1",
    "karma-chrome-launcher": "~3.1.0",
    "karma-cli": "~2.0.0",
    "karma-coverage-istanbul-reporter": "^2.1.1",
    "karma-jasmine": "~3.1.0",
    "karma-jasmine-html-reporter": "^1.5.1",
    "protractor": "~5.4.2",
    "ts-node": "~8.6.2",
    "tslint": "~5.20.1",
    "typescript": "~3.7.5"
  }
}

另外，请让我知道我是否应该提供任何额外的信息？

Answer 1

因此，事实证明，我们的HTML/CSS中有专门针对IE的黑客攻击，当我们删除它们时，这个问题就消失了。

遗憾的是，我不能确切地说这为什么会导致问题，但为了找到一些解决方案，这里有一个这样的黑客的例子：

<!--[if !IE]>
 .text-icon > :nth-child(1n) {
  flex: 1 1 0;
}
<![endif]-->

我们在我们的代码库中删除了这些代码，这个问题就消失了。

这似乎不是Syncfusion特定的问题，而是与从Angular 8升级到Angular 9有关，因为即使在repo中根本没有Syncfusion，这个问题也是相同的。

Answer 2

我相信你tsconfig.json中的目标应该是"target": "es2015"。

Answer 3

已验证您报告的问题，并且无法通过将优化设置为true (默认情况下，优化为true )来重现该问题。在angular 8中准备了Angular示例，然后使用“ng update @ angular /cli @angular/-force-allow-dirty-force”命令将angular版本更新到最新版本(9.0.6)。

angular latest version update

在提供样品时没有遇到您提到的任何类型的问题。附上了示例here.

serving