Module build failed {filename} is not part of the compilation at Angular 5.0.0

[kenneth-igaw]

Bug Report or Feature Request (mark with an x)

- [x] bug report -> please search issues before submitting
- [ ] feature request

Versions.

angular: "5.0.0"
angular/cli: "1.5.0-rc.8"
ngtools/webpack: "1.8.0-rc.8"

Repro steps.

webpack building with AngularCompilerPlugin

The log given by the failure.

Module build failed: Error: {filename} is not part of the compilation.

Desired functionality.

Mention any other details that might be useful.

Hello.

I am trying to update angular v5.0.0 released yesterday.

But the error is occurred when i try to compile with AngularCompilerPlugin plugin.

The webpack throws an error as

Module build failed {filename} is not part of the compilation
// ex) filename => app.main.ts

my tsconfig.json is as follows

// tsconfig.json
{
  "version": "1.0.0",
  "compileOnSave": true,
  "compilerOptions": {
    "target": "es5",
    "module": "commonjs",
    "moduleResolution": "node",
    "sourceMap": true,
    "emitDecoratorMetadata": true,
    "experimentalDecorators": true,
    "noImplicitAny": false,
    "removeComments": false,
    "suppressImplicitAnyIndexErrors": false,
    "strictNullChecks": false,
    "typeRoots": [
      "node_modules/@types"
    ]
  },
  "lib": [
    "dom",
    "dom.iterable",
    "es2015",
    "scripthost"
  ],
  "exclude": [
    "node_modules",
    "Content/scripts/app.aot",
    "Content/scripts/app/typings",
    "Content/scripts/app/app.main.aot.ts",
    "Content/homeworks"
  ]
}

And this is my AngularCompilerPlugin option

new AngularCompilerPlugin ({
    tsConfigPath: rootDir + '/tsconfig.json',
    entryModule: contentDir + '/scripts/app/app.module#AppModule'
}),

Other webpack configuration is not changed.

And everything worked well until I replaced the AotPlugin.

So I tried to fix the plugin's code directly to fix the problem.

And there's one question in this process,

If there is no key in object, it will exist as undefined.

In compiler_host.ts, Why does stats compare to null ?

const stats = this._files[fileName];
if (stats == null) {
    ....
}

I changed above code as follows for quickfix the issue

const stats = this._files[fileName];
if (!stats) {
    ....
}

It's worked, However i think it is not the best practice.

[KennethanCeyer]

I will put a comment with my personal account to check the progress of the issue.

[filipesilva]

Hello, this issue is a duplicate of #8284 (comment). You'll find more information there about what this error means.

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