Dependency problem when migrating to angular 8

Question

I tried to migrate an application to angular 8, but now when I run my application, I have a dependency problem in my package.json.

After updating angular / cli, when launching the application, I have the following message:

An unhandled exception occurred while processing the request. AggregateException: One or more errors occurred. (One or more errors >occurred. (The NPM script 'start' exited without indicating that the Angular >CLI was listening for requests. The error output was: An unhandled exception >occurred: Cannot find module '@angular/compiler-cli/ngcc'

Here is my package.json file

{
  "name": "ProjetPlanning",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build --extract-css",
    "build:ssr": "npm run build -- --app=ssr --output-hashing=media",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular/animations": "^5.2.0",
    "@angular/common": "^5.2.0",
    "@angular/compiler": "^5.2.0",
    "@angular/core": "^5.2.0",
    "@angular/forms": "^5.2.0",
    "@angular/platform-browser": "^5.2.0",
    "@angular/platform-browser-dynamic": "^5.2.0",
    "@angular/platform-server": "^5.2.0",
    "@angular/router": "^5.2.0",
    "@nguniversal/module-map-ngfactory-loader": "^5.0.0-beta.5",
    "aspnet-prerendering": "^3.0.1",
    "bootstrap": "^3.4.1",
    "core-js": "^2.4.1",
    "rxjs": "^5.5.6",
    "tslib": "^1.10.0",
    "zone.js": "~0.9.1"
  },
  "devDependencies": {
"@angular-devkit/build-angular": "~0.803.3",
"@angular/cli": "^8.3.3",
"@angular/compiler-cli": "^5.2.0",
"@angular/language-service": "^5.2.0",
"@types/jasmine": "~2.8.3",
"@types/jasminewd2": "~2.0.2",
"@types/node": "~6.0.60",
"codelyzer": "^5.0.1",
"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": "~2.5.3"
  },
  "optionalDependencies": {
"node-sass": "^4.9.0"

} }

I can not solve this problem and I do not know which dependencies are problematic and why

You haven't updated any of the other packages. Try using the ng update --all command to update all the Angular stuff. — Will Alexander
@WillAlexander I have this message : Incompatible peer dependencies found. Peer dependency warnings when installing dependencies means that those dependencies might not work correctly together. You can use the '--force' option to ignore incompatible peer dependencies and instead address these warnings later. — CodIng59
Sorry I'm not clear, when I execute this command, I have this message — CodIng59
The message says you can use the --force flag and then address the dependencies afterwards. So go ahead and do that ^^ — Will Alexander

Chanaka Weerasinghe Chanaka Weerasinghe · Accepted Answer · 2019-09-11T13:22:57

Change

 "start": "ng serve",
 "build": "ng build --extract-css",

to

"scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build",

Refer The NPM script 'start' exited without indicating that the Angular CLI was listening for requests

Dependency problem when migrating to angular 8

1 Answers