Angular 7 can't include jQuery and Bootstrap typings

After the new version of the Angular, I can't find typings.d.ts in my src dir that's why I can't include types.

I have installed @types/jquery and @types/bootstrap - here's my package.json file:

"dependencies": {
    "@angular/animations": "~7.1.0",
    "@angular/common": "~7.1.0",
    "@angular/compiler": "~7.1.0",
    "@angular/core": "~7.1.0",
    "@angular/forms": "~7.1.0",
    "@angular/platform-browser": "~7.1.0",
    "@angular/platform-browser-dynamic": "~7.1.0",
    "@angular/router": "~7.1.0",
    "@auth0/angular-jwt": "^2.1.0",
    "@mdi/font": "^3.0.39",
    "bootstrap": "^4.1.3",
    "core-js": "^2.5.4",
    "ehandler": "^0.2.1",
    "ehttp": "^0.2.4",
    "ng-click-outside": "^4.0.0",
    "ngd-dropdown": "^0.2.5",
    "popper.js": "^1.14.5",
    "rxjs": "~6.3.3",
    "toastr": "^2.1.4",
    "tslib": "^1.9.0",
    "zone.js": "~0.8.26"
  },
  "devDependencies": {
    "@angular-devkit/build-angular": "~0.11.0",
    "@angular/cli": "~7.1.0",
    "@angular/compiler-cli": "~7.1.0",
    "@angular/language-service": "~7.1.0",
    "@types/bootstrap": "^4.1.3",
    "@types/jasmine": "~2.8.8",
    "@types/jasminewd2": "~2.0.3",
    "@types/jquery": "^3.3.27",
    "@types/node": "~8.9.4",
    "codelyzer": "~4.5.0",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~3.1.1",
    "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": "~3.1.6"
  }

My tsconfig.json file:

"compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "module": "es2015",
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "importHelpers": true,
    "target": "es5",
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2018",
      "dom"
    ]
  }

my example.component.ts file:

@Component({
  selector: 'modal',
  templateUrl: './modal.component.html',
  styleUrls: ['./modal.component.scss']
})
export class ModalComponent implements OnInit , OnChanges {
  constructor() { }

  ngOnInit() {
    $('#modal-' + this.modal).modal('show');
  }
}

after some research, I found old ways

1. declare let $: any;
2. import * as $ from 'jquery'

but doing this doesn't allow me to use $('#modal-element').modal('show');

Error: error TS2339: Property 'modal' does not exist on type 'JQuery'. please help me. Thanx in advance