问为什么精益插件在IE11中不起作用？

EN

import 'core-js/modules/es.promise';
import 'core-js/modules/es.string.includes';
import 'core-js/modules/es.object.assign';
import 'core-js/modules/es.object.keys';
import 'core-js/modules/es.symbol';
import 'core-js/modules/es.symbol.async-iterator';
import 'regenerator-runtime/runtime';
import './unicode-regex-polyfill';
import 'zone.js/dist/zone';

import rewritePattern from 'regexpu-core';
import { generateRegexpuOptions } from '@babel/helper-create-regexp-features-plugin/lib/util';

const { RegExp } = global;
try {
  new RegExp('a', 'u');
} catch (err) {
  // @ts-ignore
  global.RegExp = function(pattern, flags) {
    if (flags && flags.includes('u')) {
      return new RegExp(
        rewritePattern(
          pattern,
          flags,
          generateRegexpuOptions({ flags, pattern })
        )
      );
    }
    return new RegExp(pattern, flags);
  };
  // @ts-ignore
  global.RegExp.prototype = RegExp;
}

{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "downlevelIteration": true,
    "experimentalDecorators": true,
    "module": "esnext",
    "moduleResolution": "node",
    "importHelpers": true,
    "target": "es5",
    "typeRoots": ["node_modules/@types"],
    "lib": ["es2017", "dom"],
    "paths": {
      "@app/*": ["src/app/*"],
      "@environments/*": ["src/environments/*"],
      "exceljs": [
        "node_modules/exceljs/dist/exceljs.min"
      ],
      // "@assets/images/*": ["src/assets/images*"]
    }
  },
  "angularCompilerOptions": {
    "fullTemplateTypeCheck": true,
    "strictInjectionParameters": true
  }
}

  "dependencies": {
    "@angular-redux/store": "^10.0.0",
    "@angular/animations": "~9.0.3",
    "@angular/cdk": "^9.2.4",
    "@angular/common": "~9.0.3",
    "@angular/compiler": "~9.0.3",
    "@angular/core": "~9.0.3",
    "@angular/forms": "~9.0.3",
    "@angular/material": "^9.2.4",
    "@angular/platform-browser": "~9.0.3",
    "@angular/platform-browser-dynamic": "~9.0.3",
    "@angular/router": "~9.0.3",
    "install": "^0.13.0",
    "jspdf": "1.4.1",
    "jspdf-autotable": "^3.5.6",
    "ngx-mat-select-search": "^3.0.0",
    "npm": "^6.14.7",
    "redux": "^4.0.1",
    "redux-devtools": "^3.5.0",
    "redux-devtools-extension": "^2.13.8",
    "rxjs": "~6.5.4",
    "tslib": "^1.10.0",
    "zone.js": "~0.10.2"
    "exceljs": "^4.1.1",
  },