Unable to run ionic old project: Cannot find name ‘bigint’

I am trying to run my old project to modification, I have successfully run npm install but unable to serve the app. It’s showing:

ERROR in node_modules/@types/node/fs.d.ts(2459,45): error TS2304: Cannot find name 'bigint'.

here is my package.json file:

{
  "name": "myApp",
  "version": "0.0.1",
  "author": "Ionic Framework",
  "homepage": "https://ionicframework.com/",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/common": "^7.2.2",
    "@angular/core": "^7.2.2",
    "@angular/forms": "^7.2.2",
    "@angular/http": "^7.2.2",
    "@angular/platform-browser": "^7.2.2",
    "@angular/platform-browser-dynamic": "^7.2.2",
    "@angular/router": "^7.2.2",
    "@fortawesome/angular-fontawesome": "^0.4.0",
    "@fortawesome/fontawesome-svg-core": "^1.2.19",
    "@fortawesome/free-brands-svg-icons": "^5.9.0",
    "@fortawesome/free-regular-svg-icons": "^5.9.0",
    "@fortawesome/free-solid-svg-icons": "^5.9.0",
    "@ionic-native/core": "^5.10.0",
    "@ionic-native/screen-orientation": "^5.13.0",
    "@ionic-native/social-sharing": "^5.10.0",
    "@ionic-native/splash-screen": "^5.10.0",
    "@ionic-native/status-bar": "^5.10.0",
    "@ionic/angular": "^4.6.2",
    "@ionic/pro": "2.0.4",
    "@ngx-translate/core": "^9.1.1",
    "cordova-android": "8.0.0",
    "cordova-android-support-gradle-release": "^3.0.1",
    "cordova-ios": "^5.0.1",
    "cordova-plugin-screen-orientation": "^3.0.2",
    "cordova-plugin-x-socialsharing": "^5.4.7",
    "cordova-res": "^0.6.0",
    "core-js": "^2.5.4",
    "es6-promise-plugin": "^4.2.2",
    "font-awesome": "^4.7.0",
    "jquery": "^3.4.1",
    "rxjs": "~6.5.1",
    "tslib": "^1.9.0",
    "zone.js": "~0.8.29"
  },
  "devDependencies": {
    "@angular-devkit/architect": "~0.13.8",
    "@angular-devkit/build-angular": "~0.13.8",
    "@angular-devkit/core": "~7.3.8",
    "@angular-devkit/schematics": "~7.3.8",
    "@angular/cli": "7.3.9",
    "@angular/compiler": "~7.2.2",
    "@angular/compiler-cli": "~7.2.2",
    "@angular/language-service": "~7.2.2",
    "@ionic/angular-toolkit": "~1.5.1",
    "@ionic/lab": "2.0.1",
    "@types/jasmine": "~2.8.8",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "^12.12.62",
    "codelyzer": "~4.5.0",
    "cordova-plugin-device": "^2.0.3",
    "cordova-plugin-ionic-keyboard": "^2.1.3",
    "cordova-plugin-ionic-webview": "^4.1.1",
    "cordova-plugin-splashscreen": "^5.0.3",
    "cordova-plugin-statusbar": "^2.4.3",
    "cordova-plugin-whitelist": "^1.3.4",
    "jasmine-core": "~2.99.1",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~4.1.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-coverage-istanbul-reporter": "^2.1.0",
    "karma-jasmine": "~1.1.2",
    "karma-jasmine-html-reporter": "^0.2.2",
    "protractor": "~5.4.0",
    "ts-node": "~8.1.0",
    "tslint": "~5.16.0",
    "typescript": "^3.1.1"
  },
  "description": "An Ionic project",
  "cordova": {
    "plugins": {
      "cordova-plugin-whitelist": {},
      "cordova-plugin-statusbar": {},
      "cordova-plugin-device": {},
      "cordova-plugin-splashscreen": {},
      "cordova-plugin-ionic-webview": {
        "ANDROID_SUPPORT_ANNOTATIONS_VERSION": "27.+"
      },
      "cordova-plugin-ionic-keyboard": {},
      "cordova-plugin-x-socialsharing": {
        "ANDROID_SUPPORT_V4_VERSION": "24.1.1+"
      },
      "cordova-plugin-screen-orientation": {},
      "cordova-android-support-gradle-release": {
        "ANDROID_SUPPORT_VERSION": "27.+"
      }
    },
    "platforms": [
      "android",
      "ios"
    ]
  }
}

can anyone please tell me where I am wrong ?

BigInt support was added to TypeScript 3.2.
Maybe changing

"typescript": "^3.1.1"

to

"typescript": "^3.2.2"

in devDependencies and running npm install again will solve your problem.