This seems like a bug but we'll need to look at a reproduction to find and fix the problem. Can you setup a minimal repro please?

You can read here why this is needed. A good way to make a minimal repro is to create a new app via ng new repro-app and adding the minimum possible code to show the problem. Then you can push this repository to github and link it here.

I am also seeing this behavior in an existing app that I just upgraded, however upon fresh installation of a new app, I can't reproduce it.

We have exactlly the same problem, hope it gets resolved soon.

`i ｢wdm｣: Compiling...
C:\Dev2\RevueDePrets\projet\src\URP.WebApp\node_modules\enhanced-resolve\lib\CachedInputFileSystem.js:92
throw data[0];
^

Error: ENOENT: no such file or directory, stat 'C:\Dev2\RevueDePrets\projet\src\URP.WebApp\src\app\app.component.ngfactory.js'
at Object.fs.statSync (fs.js:948:11)
at Object.statSync (C:\Dev2\RevueDePrets\projet\src\URP.WebApp\node_modules\graceful-fs\polyfills.js:297:22)
at Storage.provideSync (C:\Dev2\RevueDePrets\projet\src\URP.WebApp\node_modules\enhanced-resolve\lib\CachedInputFileSystem.js:98:13)
at CachedInputFileSystem.statSync (C:\Dev2\RevueDePrets\projet\src\URP.WebApp\node_modules\enhanced-resolve\lib\CachedInputFileSystem.js:251:28)
at Observable.rxjs_1.Observable.obs [as _subscribe] (C:\Dev2\RevueDePrets\projet\src\URP.WebApp\node_modules@ngtools\webpack\src\webpack-input-host.js:70:52)
at Observable._trySubscribe (C:\Dev2\RevueDePrets\projet\src\URP.WebApp\node_modules\rxjs\internal\Observable.js:43:25)
at Observable.subscribe (C:\Dev2\RevueDePrets\projet\src\URP.WebApp\node_modules\rxjs\internal\Observable.js:29:22)
at MapOperator.call (C:\Dev2\RevueDePrets\projet\src\URP.WebApp\node_modules\rxjs\internal\operators\map.js:29:23)
at Observable.subscribe (C:\Dev2\RevueDePrets\projet\src\URP.WebApp\node_modules\rxjs\internal\Observable.js:24:22)
at SyncDelegateHost._doSyncCall (C:\Dev2\RevueDePrets\projet\src\URP.WebApp\node_modules@ngtools\webpack\node_modules@angular-devkit\core\src\virtual-fs\host\sync.js:22:20)
at SyncDelegateHost.exists (C:\Dev2\RevueDePrets\projet\src\URP.WebApp\node_modules@ngtools\webpack\node_modules@angular-devkit\core\src\virtual-fs\host\sync.js:61:21)
at WebpackCompilerHost.fileExists (C:\Dev2\RevueDePrets\projet\src\URP.WebApp\node_modules@ngtools\webpack\src\compiler_host.js:195:44)
at VirtualFileSystemDecorator._statSync (C:\Dev2\RevueDePrets\projet\src\URP.WebApp\node_modules@ngtools\webpack\src\virtual_file_system_decorator.js:24:39)
at VirtualFileSystemDecorator.statSync (C:\Dev2\RevueDePrets\projet\src\URP.WebApp\node_modules@ngtools\webpack\src\virtual_file_system_decorator.js:60:29)
at virtualFilesStats._virtualInputFileSystem.getVirtualFilesPaths.map (C:\Dev2\RevueDePrets\projet\src\URP.WebApp\node_modules@ngtools\webpack\src\virtual_file_system_decorator.js:123:54)
at Array.map ()
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! urp.webapp@0.0.0 start: ng serve --aot
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the urp.webapp@0.0.0 start script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR! C:\Users\massonp3\AppData\Roaming\npm-cache_logs\2018-10-12T13_46_46_129Z-debug.log`

@filipesilva 👍
Steps to reproduce..
ng new test1
cd test1
ng serve --aot

then edit one of the project file (.ts or ,html) and save it... then the compiler crash,,,

@spaceman101 I think something is missing from that repro, because I can't see it happen locally:

$ ng serve --aot
Date: 2018-10-12T15:35:00.392Z
Hash: 4e6169354defcec46a89
Time: 10540ms
chunk {main} main.js, main.js.map (main) 22.7 kB [initial] [rendered]
chunk {polyfills} polyfills.js, polyfills.js.map (polyfills) 227 kB [initial] [rendered]
chunk {runtime} runtime.js, runtime.js.map (runtime) 6.22 kB [entry] [rendered]
chunk {styles} styles.js, styles.js.map (styles) 16.6 kB [initial] [rendered]
chunk {vendor} vendor.js, vendor.js.map (vendor) 2.08 MB [initial] [rendered]
i ｢wdm｣: Compiled successfully.
i ｢wdm｣: Compiling...

Date: 2018-10-12T15:35:04.027Z - Hash: 237ae7d9f97b67199c43 - Time: 1517ms
4 unchanged chunks
chunk {main} main.js, main.js.map (main) 22.7 kB [initial] [rendered]
i ｢wdm｣: Compiled successfully.
i ｢wdm｣: Compiling...

Date: 2018-10-12T15:35:05.877Z - Hash: 68333ef4854c0a8c6a3d - Time: 766ms
4 unchanged chunks
chunk {main} main.js, main.js.map (main) 32.4 kB [initial] [rendered]
i ｢wdm｣: Compiled successfully.
i ｢wdm｣: Compiling...

Date: 2018-10-12T15:35:07.597Z - Hash: e8c5098eadc7002e52b6 - Time: 656ms
4 unchanged chunks
chunk {main} main.js, main.js.map (main) 32.4 kB [initial] [rendered]
i ｢wdm｣: Compiled successfully.
i ｢wdm｣: Compiling...

Date: 2018-10-12T15:35:09.480Z - Hash: 0383bbc278eb2fe0c5b1 - Time: 820ms
4 unchanged chunks
chunk {main} main.js, main.js.map (main) 32.4 kB [initial] [rendered]
i ｢wdm｣: Compiled successfully.

If you have a new project that shows that behaviour can you commit it to github and share it here please?

test3.zip

This other thread has people having the same problem lately.
#12260

@spaceman101 awesome, thanks. I can't look at it today because I'm already out but can look at it Monday morning.

Can you also tell me exactly what you do to trigger the rebuild please? The file you change, and how you change it.

The exact console output you see would also help a lot.

I change the value of the var title in app.component.ts and save it. I've reproduced it with the project open in Visual Studio Code and also juste by editing the file in notepad++.

C:\Dev2\test\test3>ng serve --aot
** Angular Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **

Date: 2018-10-12T16:27:22.441Z
Hash: 355498247742d7f883be
Time: 7736ms
chunk {main} main.js, main.js.map (main) 22.4 kB [initial] [rendered]
chunk {polyfills} polyfills.js, polyfills.js.map (polyfills) 227 kB [initial] [rendered]
chunk {runtime} runtime.js, runtime.js.map (runtime) 6.22 kB [entry] [rendered]
chunk {styles} styles.js, styles.js.map (styles) 15.6 kB [initial] [rendered]
chunk {vendor} vendor.js, vendor.js.map (vendor) 2.08 MB [initial] [rendered]
i ｢wdm｣: Compiled successfully.
i ｢wdm｣: Compiling...
C:\Dev2\test\test3\node_modules\enhanced-resolve\lib\CachedInputFileSystem.js:92
                                        throw data[0];
                                        ^

Error: ENOENT: no such file or directory, stat 'C:\Dev2\test\test3\src\app\app.component.ngfactory.js'
    at Object.fs.statSync (fs.js:948:11)
    at Object.statSync (C:\Dev2\test\test3\node_modules\graceful-fs\polyfills.js:297:22)
    at Storage.provideSync (C:\Dev2\test\test3\node_modules\enhanced-resolve\lib\CachedInputFileSystem.js:98:13)
    at CachedInputFileSystem.statSync (C:\Dev2\test\test3\node_modules\enhanced-resolve\lib\CachedInputFileSystem.js:251:28)
    at Observable.rxjs_1.Observable.obs [as _subscribe] (C:\Dev2\test\test3\node_modules\@ngtools\webpack\src\webpack-input-host.js:70:52)
    at Observable._trySubscribe (C:\Dev2\test\test3\node_modules\rxjs\internal\Observable.js:43:25)
    at Observable.subscribe (C:\Dev2\test\test3\node_modules\rxjs\internal\Observable.js:29:22)
    at MapOperator.call (C:\Dev2\test\test3\node_modules\rxjs\internal\operators\map.js:29:23)
    at Observable.subscribe (C:\Dev2\test\test3\node_modules\rxjs\internal\Observable.js:24:22)
    at SyncDelegateHost._doSyncCall (C:\Dev2\test\test3\node_modules\@angular-devkit\core\src\virtual-fs\host\sync.js:22:20)
    at SyncDelegateHost.exists (C:\Dev2\test\test3\node_modules\@angular-devkit\core\src\virtual-fs\host\sync.js:61:21)
    at WebpackCompilerHost.fileExists (C:\Dev2\test\test3\node_modules\@ngtools\webpack\src\compiler_host.js:195:44)
    at VirtualFileSystemDecorator._statSync (C:\Dev2\test\test3\node_modules\@ngtools\webpack\src\virtual_file_system_decorator.js:24:39)
    at VirtualFileSystemDecorator.statSync (C:\Dev2\test\test3\node_modules\@ngtools\webpack\src\virtual_file_system_decorator.js:60:29)
    at virtualFilesStats._virtualInputFileSystem.getVirtualFilesPaths.map (C:\Dev2\test\test3\node_modules\@ngtools\webpack\src\virtual_file_system_decorator.js:123:54)
    at Array.map (<anonymous>)

C:\Dev2\test\test3>

 _                      _                 ____ _     ___
/ \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|

/ △ \ | '_ \ / | | | | |/ _ | '__| | | | | | |
/ ___ | | | | (| | || | | (| | | | || | | |
// __| ||_, |_,||_,|| _|||
|___/

Angular CLI: 6.2.5
Node: 8.11.3
OS: win32 x64
Angular: 6.1.10
... animations, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, router

Package Version

@angular-devkit/architect 0.8.5
@angular-devkit/build-angular 0.8.5
@angular-devkit/build-optimizer 0.8.5
@angular-devkit/build-webpack 0.8.5
@angular-devkit/core 0.8.5
@angular-devkit/schematics 0.8.5
@angular/cli 6.2.5
@ngtools/webpack 6.2.5
@schematics/angular 0.8.5
@schematics/update 0.8.5
rxjs 6.2.2
typescript 2.9.2
webpack 4.20.2

Workaround: #12260 (comment)

Workaround: #12260 (comment)

Nope, that's the angular.json part in the project:

architect": {
        "build": {
          "builder": "@angular-devkit/build-angular:browser",
          "options": {
            "outputPath": "dist/test3",
            "index": "src/index.html",
            "main": "src/main.ts",
            "polyfills": "src/polyfills.ts",
            "tsConfig": "src/tsconfig.app.json",
            "assets": [
              "src/favicon.ico",
              "src/assets"
            ],

@spaceman101 when you use the latest angular-cli and ng new myapp then the entire "src/favicon.ico" line needs to be removed to prevent the following error on ng serve --aot:

Error: #12553 (comment)

It appears the issue is copy-webpack-plugin@4.5.3. If you are using yarn, you can add a resolutions field to package.json to force the use of version 4.5.2. For npm, you can try to install the package as a development dependency also at 4.5.2 (for npm, this unfortunately may or may not work depending on how npm hoists the packages). There is a PR with a fix for copy-webpack-plugin which will hopefully be in version 4.5.4.

@clydin excellent! A simple npm install copy-webpack-plugin@4.5.2 --save-dev did the job. Thanks

Running npm install copy-webpack-plugin@4.5.2 --save-dev solved it for me as well. Thanks @clydin for sharing.

Running npm install copy-webpack-plugin@4.5.2 --save-dev solved it for me as well. Thanks @clydin for sharing.

It's working now! Thanks!

We have a couple of PRs that should fix this.

#12588 should fix it for Angular CLI 6.2.x. It pins copy-webpack-plugin@4.5.2 as mentioned in #12553 (comment).

To workaround this problem now you can do npm install copy-webpack-plugin@4.5.2 --no-save. This way your lockfile shouldn't even change.

For version 7 we have a more complete fix in #12591 that should fix the problem with any version of copy-webpack-plugin, using Angular CLI or @ngtools/webpack standalone.

Fixed via #12588, will be out in 6.2.6.

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