amplify-js: Duplicate identifier 'Subscriber'

Am getting duplicate identifier subscriber issue from past 2 weeks.

Package.json.

{
  "name": "test",
  "version": "0.1.9",
  "author": "Ionic Framework",
  "homepage": "http://ionicframework.com/",
  "private": true,
  "scripts": {
    "clean": "ionic-app-scripts clean",
    "build": "BUILD_ENV=${BUILD_ENV} ionic-app-scripts build",
    "lint": "ionic-app-scripts lint",
    "ionic:build": "ionic-app-scripts build",
    "ionic:serve": "ionic-app-scripts serve",
    "compodoc": "./node_modules/.bin/compodoc -p src/tsconfig.app.json -w -s",
    "test": "karma start ./test-config/karma.conf.js",
    "test-ci": "karma start ./test-config/karma.conf.js --single-run",
    "test-coverage": "karma start ./test-config/karma.conf.js --coverage",
    "e2e": "npm run e2e-update && npm run e2e-test",
    "e2e-test": "protractor ./test-config/protractor.conf.js",
    "e2e-update": "webdriver-manager update --standalone false --gecko false"
  },
  "config": {
    "ionic_generate_source_map": "true"
  },
  "dependencies": {
    "@angular/animations": "5.2.11",
    "@angular/cdk": "^5.2.5",
    "@angular/common": "5.2.11",
    "@angular/compiler": "5.2.11",
    "@angular/compiler-cli": "5.2.11",
    "@angular/core": "5.2.11",
    "@angular/forms": "5.2.11",
    "@angular/http": "5.2.11",
    "@angular/material": "^7.3.5",
    "@angular/platform-browser": "5.2.11",
    "@angular/platform-browser-dynamic": "5.2.11",
    "@ionic-native/app-center-analytics": "^4.18.0",
    "@ionic-native/app-center-crashes": "^4.18.0",
    "@ionic-native/app-version": "^4.17.0",
    "@ionic-native/barcode-scanner": "^4.20.0",
    "@ionic-native/camera": "^4.17.0",
    "@ionic-native/code-push": "^4.20.0",
    "@ionic-native/core": "~4.15.0",
    "@ionic-native/device": "4.7.0",
    "@ionic-native/dialogs": "^4.17.0",
    "@ionic-native/file": "^4.20.0",
    "@ionic-native/image-picker": "^4.17.0",
    "@ionic-native/social-sharing": "^4.17.0",
    "@ionic-native/speech-recognition": "^4.17.0",
    "@ionic-native/splash-screen": "~4.15.0",
    "@ionic-native/status-bar": "~4.15.0",
    "@ionic/pro": "2.0.3",
    "@ionic/storage": "2.2.0",
    "apollo-client": "^2.6.2",
    "aws-amplify": "^1.2.4",
    "aws-amplify-angular": "^3.0.3",
    "aws-appsync": "^1.8.0",
    "cordova-android": "7.1.4",
    "cordova-android-play-services-gradle-release": "^2.0.0",
    "cordova-android-support-gradle-release": "^2.0.1",
    "cordova-browser": "5.0.4",
    "cordova-ios": "4.5.4",
    "cordova-plugin-app-version": "^0.1.9",
    "cordova-plugin-camera": "^4.0.3",
    "cordova-plugin-compat": "^1.2.0",
    "cordova-plugin-device": "^2.0.2",
    "cordova-plugin-dialogs": "^2.0.1",
    "cordova-plugin-file": "^6.0.1",
    "cordova-plugin-file-transfer": "^1.7.1",
    "cordova-plugin-ionic": "^5.3.0",
    "cordova-plugin-ionic-keyboard": "^2.1.3",
    "cordova-plugin-ionic-webview": "^2.2.5",
    "cordova-plugin-speechrecognition": "^1.2.0",
    "cordova-plugin-splashscreen": "^5.0.2",
    "cordova-plugin-statusbar": "^2.4.2",
    "cordova-plugin-telerik-imagepicker": "^2.2.2",
    "cordova-plugin-whitelist": "^1.3.3",
    "cordova-plugin-x-socialsharing": "^5.4.3",
    "cordova-plugin-zip": "^3.1.0",
    "es6-promise-plugin": "^4.2.2",
    "font-awesome": "^4.7.0",
    "graphql-tag": "^2.10.1",
    "ionic-angular": "3.9.2",
    "ionic-long-press": "^1.5.0",
    "ionicons": "3.0.0",
    "ng2-translate": "^5.0.0",
    "phonegap-plugin-barcodescanner": "^8.0.1",
    "primeng": "^5.2.7",
    "rxjs": "5.5.11",
    "sentry-cordova": "^0.15.0",
    "sw-toolbox": "3.6.0",
    "zone.js": "0.8.26"
  },
  "devDependencies": {
    "@compodoc/compodoc": "^1.1.8",
    "@ionic/app-scripts": "3.2.2",
    "@types/jasmine": "^2.8.12",
    "@types/node": "^10.12.10",
    "angular2-template-loader": "^0.6.2",
    "html-loader": "^0.5.5",
    "istanbul-instrumenter-loader": "^3.0.1",
    "jasmine": "^2.99.0",
    "jasmine-spec-reporter": "^4.2.1",
    "karma": "^3.1.1",
    "karma-chrome-launcher": "^2.2.0",
    "karma-coverage-istanbul-reporter": "^2.0.4",
    "karma-jasmine": "^2.0.1",
    "karma-jasmine-html-reporter": "^1.4.0",
    "karma-sourcemap-loader": "^0.3.7",
    "karma-webpack": "^3.0.5",
    "null-loader": "^0.1.1",
    "protractor": "^5.4.1",
    "ts-loader": "^3.5.0",
    "ts-node": "^7.0.1",
    "typescript": "3.3.3333",
    "webpack": "^3.12.0"
  },
  "description": "An Ionic project",
  "cordova": {
    "plugins": {
      "cordova-plugin-statusbar": {},
      "cordova-plugin-device": {},
      "cordova-plugin-splashscreen": {},
      "cordova-plugin-ionic-webview": {
        "ANDROID_SUPPORT_ANNOTATIONS_VERSION": "27.+"
      },
      "cordova-plugin-ionic-keyboard": {},
      "cordova-plugin-speechrecognition": {},
      "cordova-plugin-dialogs": {},
      "cordova-plugin-camera": {},
      "cordova-plugin-file": {},
      "cordova-plugin-file-transfer": {},
      "cordova-plugin-zip": {},
      "cordova-plugin-app-version": {},
      "cordova-plugin-telerik-imagepicker": {
        "PHOTO_LIBRARY_USAGE_DESCRIPTION": "Allow to access your gallery"
      },
      "cordova-plugin-x-socialsharing": {
        "ANDROID_SUPPORT_V4_VERSION": "24.1.1+"
      },
      "cordova-plugin-appcenter-analytics": {},
      "cordova-plugin-appcenter-crashes": {},
      "cordova-android-play-services-gradle-release": {
        "PLAY_SERVICES_VERSION": "15.+"
      },
      "cordova-android-support-gradle-release": {
        "ANDROID_SUPPORT_VERSION": "27.+"
      },
      "cordova-plugin-code-push": {},
      "phonegap-plugin-barcodescanner": {
        "ANDROID_SUPPORT_V4_VERSION": "27.+"
      },
      "cordova-plugin-whitelist": {},
      "sentry-cordova": {}
    },
    "platforms": [
      "ios",
      "android"
    ]
  }
}

We gone through https://github.com/aws-amplify/amplify-js/issues/3248 issue and updated the comment but i did’t get any reply on that.