For a few days I have a problem with a certain error: Uncaught Error: JIT compiler unavailable. After upgrading angular from version 8 to 12 there was a problem that I run the ng build --prod --output-path = dist command and build Angular I have no problems, but when I start the page, this problem with JIT pops up. I have tried all the solutions from stack overflow like I add in my package.json

scripts{
 "postinstall": "ngcc --properties es5 browser module main --first-only"
}

I add in main.ts '@angular/compiler' Also in tsconfig.json in "angularCompilerOptions" I changed "enableIvy" to true One post says to change to true, the other that to false, but none of these solutions work for me. I reinstall node_modules couple of times and adding couple of dependecies but nothing really worked. This is my tsconfig file:

{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "downlevelIteration": true,
    "experimentalDecorators": true,
    "module": "es2020",
    "moduleResolution": "node",
    "importHelpers": true,
    "resolveJsonModule": true,
    "target": "es5",
    "skipLibCheck": true, 
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2015",
      "dom"
    ],
    "paths": {
      // "tslib": ["../frontend/node_modules/tslib/tslib.d.ts"]
    }
  },
  "angularCompilerOptions": {
    "fullTemplateTypeCheck": true,
    "strictInjectionParameters": true,
    "enableIvy": true,
  }
}

In my package.json i add this line of code:

"scripts": {
    "postinstall": "ngcc --properties es2015 browser module main --first-only --create-ivy-entry-points"
}

In angular.json i changed aot: true, and buildOptimizer: false but it didin't change anything at all. In this post "https://stackoverflow.com/questions/68798086/jit-compiler-unavailable-after-angular-update" there is answer about changing Webpack configuration. But we dont use webpack so i dont really understand this. Can you help with this issue?