Angular 10: Path Mapping shows error in VSCode when import

Question

So I updated a project that was in Angular 8.2 (a project template) to version 10 and followed the instructions from https://update.angular.io/ and everything was ok, but when implemented Path Mapping the pain started, I'm getting this error everywhere:

Cannot find module '@environments/environment' or its corresponding type declarations.ts(2307)

And this error applies to @environments and @modules , which are declared in paths, the others does not show any error cause they are not in use.

Right now the project is building correctly when use ng build , haven't tried ng build --prod , no errors appear but Visual Studio Code (v1.46.1) is showing me the imports with errors, this is that I have:

src/tsconfig.json

{
  "files": [],
  "references": [
    {
      "path": "./tsconfig.app.json"
    },
    {
      "path": "./e2e/tsconfig.json"
    }
  ]
}

src/tsconfig.app.json

{
  "extends": "./tsconfig.base.json",
  "compilerOptions": {
    "outDir": "./lw/app",
    "types": []
  },
  "files": ["src/main.ts", "src/polyfills.ts"],
  "include": ["src/**/*.d.ts"],
  "exclude": ["src/test.ts", "src/**/*.spec.ts"]
}

src/tsconfig.base.json

{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "src",
    "outDir": "./dist/lw",
    "sourceMap": true,
    "declaration": false,
    "downlevelIteration": true,
    "experimentalDecorators": true,
    "module": "es2020",
    "moduleResolution": "node",
    "importHelpers": true,
    "target": "es2015",
    "emitDecoratorMetadata": true,
    "noImplicitAny": false,
    "typeRoots": ["node_modules/@types"],
    "lib": ["es2018", "dom"],
    "paths": {
      "@angular/*": ["./node_modules/@angular/*"],
      "@assets/*": ["assets/*"],
      "@environments/*": ["environments/*"],
      "@api/*": ["app/api/*"],
      "@components/*": ["app/components/*"],
      "@login/*": ["app/login/*"],
      "@models/*": ["app/models/*"],
      "@pages/*": ["app/pages/*"],
      "@services/*": ["app/services/*"],
      "@shared/*": ["app/shared/*"]
    }
  },
  "angularCompilerOptions": {
    "fullTemplateTypeCheck": true,
    "strictTemplates": true,
    "strictInjectionParameters": true
  }
}

NOTE: Have tried with "baseUrl": "src" and "baseUrl": "./src" and "baseUrl": "./" and nothing change.

Build Result

 $ ng build Generating ES5 bundles for differential loading... ES5 bundle generation complete. chunk {polyfills} polyfills-es2015.js, polyfills-es2015.js.map (polyfills) 141 kB [initial] [rendered] chunk {polyfills-es5} polyfills-es5.js, polyfills-es5.js.map (polyfills-es5) 656 kB [initial] [rendered] chunk {main} main-es2015.js, main-es2015.js.map (main) 12.2 kB [initial] [rendered] chunk {main} main-es5.js, main-es5.js.map (main) 14.8 kB [initial] [rendered] chunk {main} main-es2015.js, main-es2015.js.map (main) 12.2 kB [initial] [rendered] chunk {main} main-es5.js, main-es5.js.map (main) 14.8 kB [initial] [rendered] chunk {styles} styles-es2015.js, styles-es2015.js.map (styles) 928 kB [initial] [rendered] chunk {styles} styles-es5.js, styles-es5.js.map (styles) 930 kB [initial] [rendered] chunk {runtime} runtime-es2015.js, runtime-es2015.js.map (runtime) 6.16 kB [entry] [rendered] chunk {runtime} runtime-es5.js, runtime-es5.js.map (runtime) 6.16 kB [entry] [rendered] chunk {vendor} vendor-es2015.js, vendor-es2015.js.map (vendor) 2.16 MB [initial] [rendered] chunk {vendor} vendor-es5.js, vendor-es5.js.map (vendor) 2.51 MB [initial] [rendered] chunk {scripts} scripts.js, scripts.js.map (scripts) 167 kB [entry] [rendered] Date: 2020-07-03T02:50:44.017Z - Hash: aa2180f982b4b754ebb6 - Time: 8621ms

VSCode info

Version: 1.46.1 (user setup)
Commit: cd9ea6488829f560dc949a8b2fb789f3cdc05f5d
Date: 2020-06-17T21:13:20.174Z
Electron: 7.3.1
Chrome: 78.0.3904.130
Node.js: 12.8.1
V8: 7.8.279.23-electron.0
OS: Windows_NT x64 10.0.18363

Angular CLI

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 10.0.1
Node: 12.18.1
OS: win32 x64

Angular: 10.0.2
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.1000.1
@angular-devkit/build-angular     0.1000.1
@angular-devkit/build-optimizer   0.1000.1
@angular-devkit/build-webpack     0.1000.1
@angular-devkit/core              10.0.1
@angular-devkit/schematics        10.0.1
@angular/cli                      10.0.1
@ngtools/webpack                  10.0.1
@schematics/angular               10.0.1
@schematics/update                0.1000.1
rxjs                              6.5.5
typescript                        3.9.6
webpack                           4.43.0

Also here is a picture of how my project is organized

Also one really weird thing that happens is for example I have 2 Services (I'm having the problems in every Service) one CityService (which is in use) and ColorService (which is not in use), CityService is not showing any error and I can access the module definition (F12), but in ColorService with the same structure the problems appear and are in red.

Answer 1

I have resolved this with below changes.

1. just change the path of extends("extends": "../tsconfig.json",) in tsconfig.app.json and tsconfi.app.json
2. Copy all code the from tsconfig.base.json to tsconfig.json file.

Below is the code of tsconfig.json file.
{
  "compileOnSave": false,
  "compilerOptions": {
    "baseUrl": "./",
    "downlevelIteration": true,
    "module": "es2020",
    "outDir": "./dist/out-tsc",
    "sourceMap": true,
    "declaration": false,
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "target": "es2015",
    "strict": false,
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2017",
      "dom"
    ],
    "paths": {
      "@app-models": [
        "src/app/model/index"
      ],     
      "@app-core": [
        "src/app/core/index"
      ],
      "@app-shared": [
        "src/app/shared/index"
      ]
    }
  }
}

3. 
A) If you have an active ng serve, restart the ng serve
       CTRL + C
       ng serve
B) If you don't have an active ng serve, do this:

       Command + Shift + P
       Search for "TypeScript: Restart TS Server"
       Hit enter

Answer 2

Please try to change

'environments/environment'

To

'src/environments/environment'