Since IVY WARNING "environment.prod.ts is part of the TypeScript compilation but it's unused."

[ofirrifo]

🐞 Bug report

I updated my project from angular 8 to 9.1 and now I get this WARNING:

WARNING in /Users/.../src/environments/environment.prod.ts is part of the TypeScript compilation but it's unused.
Add only entry points to the 'files' or 'include' properties in your tsconfig.

my main tsconfig.json file

{
  "compileOnSave": false,
  "compilerOptions": {
    "incremental": true,
    "module": "esnext",
    "outDir": "./dist/out-tsc",
    "baseUrl": "src",
    "sourceMap": true,
    "declaration": false,
    "moduleResolution": "node",
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "noUnusedLocals": false,
    "noUnusedParameters": false,
    "noImplicitReturns": true,
    "target": "es2015",
    "typeRoots": [
      "node_modules/@types"
    ],
    "lib": [
      "es2016",
      "dom"
    ]
  },
  "plugins": [
    {
      "name": "@angular/language-service"
    }
  ],
  "angularCompilerOptions": {
    "preserveWhitespaces": false
  },
  "exclude": [
    "node_modules"
  ]
}

Command (mark with an x)

• [x ] build
• serve

Is this a regression?

Yes it is regression.
the warning never show before the update to Angular 9.1

🔬 Minimal Reproduction

execute npm start or npm build

-->

🔥 Exception or Error

WARNING in /Users/.../src/environments/environment.prod.ts is part of the TypeScript compilation but it's unused.
Add only entry points to the 'files' or 'include' properties in your tsconfig.

🌍 Your Environment

Angular CLI: 9.1.1
Node: 12.3.1
OS: darwin x64

Angular: 9.1.2
... animations, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... platform-server, router, service-worker
Ivy Workspace: Yes

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.901.1
@angular-devkit/build-angular     0.901.1
@angular-devkit/build-optimizer   0.901.1
@angular-devkit/build-webpack     0.901.1
@angular-devkit/core              9.1.1
@angular-devkit/schematics        9.1.1
@angular-devkit/schematics-cli    0.803.26
@angular/cdk                      9.2.1
@angular/cli                      9.1.1
@angular/material                 9.2.1
@ngtools/webpack                  9.1.1
@nguniversal/common               9.1.0
@nguniversal/express-engine       9.1.0
@schematics/angular               9.1.1
@schematics/schematics            0.803.26
@schematics/update                0.901.1
rxjs                              6.5.5
typescript                        3.8.3
webpack                           4.42.0

[alan-agius4]

As per the above error, error message you need to add only entry points to the 'files' or 'include' properties in your tsconfig, currently you have none, which results in files which are not needed for the compilation to be in the compilation.

Example:

angular-cli/packages/schematics/angular/application/files/tsconfig.app.json.template

Lines 7 to 13 in 5464333

	"files": [
	"src/main.ts",
	"src/polyfills.ts"
	],
	"include": [
	"src/**/*.d.ts"
	]

[ofirrifo]

@alan-agius4
I don't have in my project tsconfig.app.json.template I have only the tsconfig.json
in the root of my project.

so I should add this to tsconfig.json ?

 "files": [ 
   "src/main.ts", 
   "src/polyfills.ts" 
 ], 
 "include": [ 
   "src/**/*.d.ts" 
 ] 

And I wonder why it not update when I executed the ng update command

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