npm / angular issue: Could not resolve module @angular/core

Question

Out of the blue after restarting my computer, my project started giving this error while running npm run start. I have uninstalled/reinstalled node, deleted the node modules, reinstalled angular-cli, run npm install several times and still I get the same error. I can see that the @angular folder is there and inside it there is the core folder.

I have checked threads where people had similar problems and nothing really helped. The information on this error seems meagre with an exception or two.

Has anybody faced this problem before?

packages.json

{
  "name": "ag-grid-demo",
  "version": "0.0.0",
  "license": "MIT",
  "scripts": {
    "ng": "ng",
    "start": "ng serve",
    "build": "ng build --prod",
    "test": "ng test",
    "lint": "ng lint",
    "e2e": "ng e2e"
  },
  "private": true,
  "dependencies": {
    "@angular-devkit/core": "^7.2.0",
    "@angular/animations": "^5.0.0",
    "@angular/common": "^5.0.0",
    "@angular/compiler": "^5.0.0",
    "@angular/core": "^5.0.0",
    "@angular/forms": "^5.0.0",
    "@angular/http": "^5.0.0",
    "@angular/platform-browser": "^5.0.0",
    "@angular/platform-browser-dynamic": "^5.0.0",
    "@angular/router": "^5.0.0",
    "@ng-bootstrap/ng-bootstrap": "^4.0.1",
    "ag-grid-angular": "^20.0.0",
    "ag-grid-community": "^20.0.0",
    "ag-grid-enterprise": "^20.0.0",
    "core-js": "^2.4.1",
    "rxjs": "^5.5.2",
    "zone.js": "^0.8.14"
  },
  "devDependencies": {
    "@angular/cli": "1.6.1",
    "@angular/compiler-cli": "^5.0.0",
    "@angular/language-service": "^5.0.0",
    "@types/jasmine": "~2.5.53",
    "@types/jasminewd2": "~2.0.2",
    "@types/node": "~6.0.60",
    "codelyzer": "^4.0.1",
    "jasmine-core": "~2.6.2",
    "jasmine-spec-reporter": "~4.1.0",
    "karma": "~1.7.0",
    "karma-chrome-launcher": "~2.1.1",
    "karma-cli": "~1.0.1",
    "karma-coverage-istanbul-reporter": "^1.2.1",
    "karma-jasmine": "~1.1.0",
    "karma-jasmine-html-reporter": "^0.2.2",
    "lodash": "^4.17.11",
    "protractor": "^5.4.2",
    "ts-node": "~3.2.0",
    "tslint": "~5.7.0",
    "typescript": "~2.4.2"
  }
}

@MCMatan: I added it in my post. I don't know what I should look at there. Do you see something wrong in it? — Midas
– Midas, Commented Feb 8, 2019 at 15:40
What's the webpack config look like, since that's what's failing here? — nitind
– nitind, Commented Feb 8, 2019 at 15:47
Your package json is installing cli version 1.6.1. However, angular packages version is ^5.0.0. Npm is installing higher version of angular packages (probably 7). Fix your versions or use ~5.0.0. It will solve your issue. — Akanksha Gaur
– Akanksha Gaur, Commented Feb 8, 2019 at 16:55
@AkankshaGaur: Thank you. The problem was releated to the tsconfig.json which got corrupted for some reason. — Midas
– Midas, Commented Feb 11, 2019 at 9:10

Daeho Ro · Accepted Answer · 2019-10-12 12:40:06Z

4

I solved the problem. I didn't need to touch my packages at all. My tsconfig.json was corrupt for some weird reason. I restored it, removed the node_modules, deleted package-lock.json and run

npm install

edited Oct 12, 2019 at 12:40

Daeho Ro

13.7k4 gold badges25 silver badges50 bronze badges

answered Feb 11, 2019 at 9:09

Midas

6111 gold badge7 silver badges21 bronze badges

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