Angular - TypeError: Cannot read property 'write' of undefined

Seems to be caused by latest version of Angular CLI (released today). I worked around it by installing previous version (6.0.8) globally.

Update:

As per prionp answer below:

Angular CLI v6.1.2 fixed the issue.

Update your version :

npm update -g @angular/cli

It's because of the new Angular version. Go with the old Angular version:

npm uninstall -g @angular/cli
npm install -g @angular/[email protected]

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