EMFILE: too many open files on ng build #2745

OS?

Windows 10

Versions.

angular-cli: 1.0.0-beta.17
node: 6.3.0
os: win32 x64

Repro steps.

Assets folder contains 2600+ files.
Run: ng build --prod

The log given by the failure.

16000ms building modules
57ms sealing
1ms optimizing
0ms basic module optimization
227ms module optimization
1ms advanced module optimization
29ms basic chunk optimization
1ms chunk optimization
0ms advanced chunk optimization
0ms module and chunk tree optimization
129ms module reviving
12ms module order optimization
13ms module id optimization
7ms chunk reviving
34ms chunk order optimization
48ms chunk id optimization
99ms hashing
2ms module assets processing
215ms chunk assets processing
7ms additional chunk assets processing
0ms recording
0ms additional asset processing
4266ms chunk asset optimization
4012ms asset optimization
95% emitting{ Error: EMFILE: too many open files, open '\app\dist\assets\ckeditor\plugins\smiley\lang\el.js'
at Error (native)
errno: -4066,
code: 'EMFILE',
syscall: 'open',
path: '\app\dist\assets\ckeditor\plugins\smiley\lang\el.js' }
fs.js:640
return binding.open(pathModule._makeLong(path), stringToFlags(flags), mode);
^

Error: EMFILE: too many open files, open '\app\node_modules\webpack\lib\Compiler.js'
at Error (native)
at Object.fs.openSync (fs.js:640:18)
at Object.fs.readFileSync (fs.js:508:33)
at getErrorSource (\app\node_modules\awesome-typescript-loader\node_modules\source-map-support\source-map-support.js:379:21)
at printErrorAndExit (\app\node_modules\awesome-typescript-loader\node_modules\source-map-support\source-map-support.js:395:16)
at process.emit (\app\node_modules\awesome-typescript-loader\node_modules\source-map-support\source-map-support.js:415:16)
at process._fatalException (bootstrap_node.js:254:26)

Mention any other details that might be useful.

I have to copy assets manually each time.

I removed full path from log due to client privacy.