Ng Serve fails at 95% - TypeError: callbacks[i] is not a function

Versions

Angular CLI: 1.6.8
Node: 9.5.0
OS: darwin x64
Angular: 5.2.4
@angular/cli: 1.6.8
@angular-devkit/build-optimizer: 0.0.42
@angular-devkit/core: 0.0.29
@angular-devkit/schematics: 0.0.52
@ngtools/json-schema: 1.1.0
@ngtools/webpack: 1.9.8
@schematics/angular: 0.1.17
typescript: 2.5.3
webpack: 3.10.0

  MacOS High Sierra 10.13.3

Repro steps

MacBook-Pro:~ daniel$ ng new test-proj … Installed packages for tooling via npm. Successfully initialized git. Project ‘test-proj’ successfully created.

MacBook-Pro:~ daniel$ cd test-proj/

MacBook-Pro:test-proj daniel$ npm install up to date in 6.008s

MacBook-Pro:test-proj daniel$ ng serve

Observed behavior

** NG Live Development Server is listening on localhost:4200, open your browser on http://localhost:4200/ **
 95% emitting/Users/daniel/test-proj/node_modules/enhanced-resolve/lib/CachedInputFileSystem.js:40
		callbacks[i](err, result);
		            ^

TypeError: callbacks[i] is not a function
    at Storage.finished (/Users/daniel/test-proj/node_modules/enhanced-resolve/lib/CachedInputFileSystem.js:40:15)
    at /Users/daniel/test-proj/node_modules/enhanced-resolve/lib/CachedInputFileSystem.js:77:9
    at /Users/daniel/test-proj/node_modules/graceful-fs/polyfills.js:287:18
    at FSReqWrap.oncomplete (fs.js:167:5)

Desired behavior

For build to be 100% successful and served to browser

[danielszenasi]

npm install copy-webpack-plugin@4.3.0 solved the problem

[tsvetomir]

Please use reactions for “me too” comments. My inbox would appreciate it, thanks!