Application not loading in IE11

[ajavedw]

Hi, i am facing an issue where my app is not loading in IE 11 after adding ngx-treeview. I am getting the following error

My package.json file is

"scripts": {
"ng": "ng",
"start": "ng serve --extract-css",
"build": "ng build --extract-css",
"build:ssr": "npm run build -- --app=ssr --output-hashing=media",
"test": "ng test",
"lint": "ng lint",
"e2e": "ng e2e",
"postinstall": "ngcc"
},
"private": true,
"dependencies": {
"@angular-slider/ngx-slider": "^2.0.3",
"@angular/animations": "^9.1.13",
"@angular/common": "^9.1.13",
"@angular/compiler": "^9.1.13",
"@angular/core": "^9.1.13",
"@angular/forms": "^9.1.13",
"@angular/platform-browser": "^9.1.13",
"@angular/platform-browser-dynamic": "^9.1.13",
"@angular/platform-server": "^9.1.13",
"@angular/router": "^9.1.13",
"@fortawesome/fontawesome-free": "^5.15.3",
"@ng-select/ng-select": "4.0.4",
"angular-polyfills": "^1.0.1",
"aspnet-prerendering": "^3.0.1",
"bootstrap": "^4.6.0",
"btoa": "^1.2.1",
"classlist.js": "^1.1.20150312",
"console-polyfill": "^0.3.0",
"core-js": "^2.4.1",
"hidden-attribute-polyfill": "^0.1.0",
"ie9-oninput-polyfill": "^1.1.1",
"jquery": "^3.4.1",
"ngx-bootstrap": "^6.2.0",
"ngx-infinite-scroll": "^9.1.0",
"ngx-treeview": "^10.0.2",
"node-sass": "^4.14.1",
"responsive-toolkit": "^2.6.3",
"rxjs": "^6.6.3",
"rxjs-compat": "^6.0.0-rc.0",
"tslib": "^1.10.0",
"web-animations-js": "^2.3.2",
"zone.js": "~0.10.2"
},
"devDependencies": {
"@angular-devkit/build-angular": "~0.901.13",
"@angular/cli": "^9.1.13",
"@angular/compiler-cli": "^9.1.13",
"@angular/language-service": "^9.1.13",
"@types/jasmine": "~2.8.3",
"@types/jasminewd2": "~2.0.2",
"@types/node": "^12.11.1",
"codelyzer": "^5.1.2",
"jasmine-core": "~2.8.0",
"jasmine-spec-reporter": "~4.2.1",
"karma": "~2.0.0",
"karma-chrome-launcher": "~2.2.0",
"karma-coverage-istanbul-reporter": "^1.2.1",
"karma-jasmine": "~1.1.0",
"karma-jasmine-html-reporter": "^0.2.2",
"protractor": "~5.1.2",
"ts-node": "~4.1.0",
"tslint": "~5.9.1",
"typescript": "~3.8.3"
},

and tsconfig.json is

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

I am not sure why I am getting this error.