Angular: after moving from Karma to Jest, Error "Unrecognized CLI Parameters"

Question

I updated my project from Angular 6.4 to Angular 7.1 and now running the script: ng test app-name --coverage gives me the error:

● Unrecognized CLI Parameters:

  Following options were not recognized:
  ["main", "polyfills", "tsConfig"]

  CLI Options Documentation:
  https://jestjs.io/docs/en/cli.html

The configuration for the test command in angular.json looks like this:

"test": {
  "builder": "@angular-builders/jest:run",
  "options": {
    "main": "apps/app-name/src/test.ts",
    "polyfills": "apps/app-name/src/polyfills.ts",
    "tsConfig": "apps/app-name/tsconfig.spec.json",
    "configPath": "./jest.config.json",
    "styles": [
      "apps/app-name/src/styles.scss"
    ],
    "scripts": [],
    "assets": [
      "apps/app-name/src/favicon.ico",
      "apps/app-name/src/assets"
    ]
  }
},

How am I supposed to update the config to be compatible with Angular 7?

Answer 1

The error was that I forgot to remove/replace the old karma-builder configuration when I moved to Jest.

Apparently Angular 7 checks things like that better than Angular 6 (hooray!), so I mistook it for an Angular or Jest bug.