Angular 6 target es5 IE语法错误（箭头功能）

Question

IE中的错误：vendor.js（82613,35）

const emitsWrappingTags = (node) => {
  return !!node.kind;
};

基本上是说IE不知道什么是箭头功能。

tsconfig.json

{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "../wwwroot/dist/out-tsc",
    "sourceMap": false,
    "declaration": false,
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es5",
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2017",
      "dom"
    ],
    "noImplicitAny": false,
    "suppressImplicitAnyIndexErrors": true
  },
  "exclude": [
    "node_modules"
  ]
}

polyfills.ts

 /** IE9, IE10 and IE11 requires all of the following polyfills. **/
 import 'core-js/es6/symbol';
 import 'core-js/es6/object';
 import 'core-js/es6/function';
 import 'core-js/es6/parse-int';
 import 'core-js/es6/parse-float';
 import 'core-js/es6/number';
 import 'core-js/es6/math';
 import 'core-js/es6/string';
 import 'core-js/es6/date';
 import 'core-js/es6/array';
 import 'core-js/es6/regexp';
 import 'core-js/es6/map';
 import 'core-js/es6/weak-map';
 import 'core-js/es6/set';
 /** IE10 and IE11 requires the following for NgClass support on SVG elements */
 import 'classlist.js';  // Run `npm install --save classlist.js`.
 /** IE10 and IE11 requires the following for the Reflect API. */
 import 'core-js/es6/reflect';
 /** Evergreen browsers require these. **/
 // Used for reflect-metadata in JIT. If you use AOT (and only Angular decorators), you can remove.
 import 'core-js/es7/reflect';

 * Zone JS is required by default for Angular itself.
 */
 import 'zone.js/dist/zone';  // Included with Angular CLI.

package.json

{
  "name": "client-app",
  "version": "0.0.0",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^6.1.10",
    "@angular/common": "^6.1.0",
    "@angular/compiler": "^6.1.0",
    "@angular/core": "^6.1.0",
    "@angular/forms": "^6.1.0",
    "@angular/http": "^6.1.0",
    "@angular/platform-browser": "^6.0.3",
    "@angular/platform-browser-dynamic": "^6.0.3",
    "@angular/router": "^6.1.0",
    "@fortawesome/angular-fontawesome": "^0.2.1",
    "@fortawesome/fontawesome-svg-core": "^1.2.28",
    "@fortawesome/free-solid-svg-icons": "^5.13.0",
    "angular-highlightjs": "^0.6.2",
    "bootstrap": "^4.4.1",
    "classlist.js": "^1.1.20150312",
    "core-js": "^2.5.4",
    "highlightjs": "^9.8.0",
    "jquery": "^3.5.0",
    "moment": "^2.24.0",
    "ngx-bootstrap": "^3.0.1",
    "ngx-highlight-js": "^2.1.1",
    "ngx-highlightjs": "^3.0.3",
    "ngx-toastr": "^8.10.2",
    "nl2br-pipe": "^1.1.0",
    "rxjs": "~6.2.0",
    "zone.js": "~0.8.26"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.8.0",
    "@angular/cli": "~6.2.4",
    "@angular/compiler-cli": "^6.1.0",
    "@angular/language-service": "^6.1.0",
    "@types/jasmine": "~2.8.8",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "~8.9.4",
    "codelyzer": "~4.3.0",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~3.0.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "~2.0.1",
    "karma-jasmine": "~1.1.2",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.4.0",
    "ts-node": "~7.0.0",
    "tslint": "~5.11.0",
    "typescript": "~2.9.2"
  }
}

tsconfig.app.json

{
  "extends": "../tsconfig.json",
  "compilerOptions": {
    "outDir": "../out-tsc/app",
    "types": []
  },
  "exclude": [
    "test.ts",
    "**/*.spec.ts"
  ]
}

我已经看到许多类似的问题和解决方案，但是没有一个适合我的项目。无论上面的设置如何，Typescript都可以编译为es6。我猜想它与节点包有关，但找不到哪个。

Answer 1

我发现了引起问题的原因。在我的package.json中，我有：

 "highlightjs": "^9.8.0"

后来我在package-lock.json中看到版本是10.0.0

"highlight.js": {
      "version": "10.0.0",

如我们所见：https://github.com/highlightjs/highlight.js/blob/master/VERSION_10_UPGRADE.md

[如果您的用户使用的浏览器非常旧，则可能不再支持它们（不再使用IE11等）。 （我们现在正在使用ES2015代码。）