Error only on Build --prod : Could not load the summary for directive CdkObserveContent

[ofatim]

What is the current behavior?

on ng build --prod i get this error :

ERROR in : Illegal state: Could not load the summary for directive CdkObserveContent in C:/Projets/demoFrontEnd/node_modules/@angular/cdk/observers/typings/index.d.ts.

but it's working when i serve
i'm a bigenner in Angularjs so i dont andrestand the error message. do you have idea wath can be the problem ?

What are the steps to reproduce?

i m using the exemple her : https://loiane.com/2017/08/angular-hide-navbar-login-page/
in order to make a login page authentificating user to a Java Rest API

What is the use-case or motivation for changing an existing behavior?

i need to build for prod

Which versions of Angular, Material, OS, TypeScript, browsers are affected?

this is my package.json :

{
  "name": "demo-front-end",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build --prod",
    "build-war": "gulp build-war",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^5.2.10",
    "@angular/cdk": "^5.2.4",
    "@angular/common": "^5.2.10",
    "@angular/compiler": "^5.2.10",
    "@angular/core": "^5.2.10",
    "@angular/forms": "^5.2.10",
    "@angular/http": "^5.2.10",
    "@angular/material": "^5.2.4",
    "@angular/platform-browser": "^5.2.10",
    "@angular/platform-browser-dynamic": "^5.2.10",
    "@angular/router": "^5.2.10",
    "angular-material": "^1.1.8",
    "angular2-jwt": "^0.2.3",
    "core-js": "^2.5.5",
    "rxjs": "^5.5.10",
    "zone.js": "^0.8.26"
  },
  "devDependencies": {
    "@angular/cli": "^1.7.4",
    "@angular/compiler-cli": "^5.2.10",
    "@angular/language-service": "^5.2.10",
    "@types/jasmine": "~2.8.6",
    "@types/jasminewd2": "~2.0.3",
    "@types/node": "^9.6.5",
    "codelyzer": "^4.2.1",
    "del": "^3.0.0",
    "grunt": "^1.0.2",
    "grunt-war": "^0.5.1",
    "gulp": "^3.9.1",
    "gulp-clean-css": "^3.9.3",
    "gulp-concat": "^2.6.1",
    "gulp-htmlclean": "^2.7.22",
    "gulp-inject": "^4.3.2",
    "gulp-uglify": "^3.0.0",
    "gulp-war": "^0.1.4",
    "gulp-webserver": "^0.9.1",
    "gulp-zip": "^4.1.0",
    "jasmine-core": "~3.1.0",
    "jasmine-spec-reporter": "~4.2.1",
    "karma": "~2.0.0",
    "karma-chrome-launcher": "~2.2.0",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^1.4.2",
    "karma-jasmine": "~1.1.1",
    "karma-jasmine-html-reporter": "^1.0.0",
    "protractor": "~5.3.1",
    "ts-node": "~5.0.1",
    "tslint": "~5.9.1",
    "typescript": "^2.6.1"
  }
}

do you have idea what can be the problem ?

[jelbourn]

Based on #8070, I think this is an issue with your tsconfig

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