Bug Report or Feature Request (mark with an x)

• bug report -> please search issues before submitting
• feature request

Versions.

@angular/cli: 1.4.9
node: 8.8.1
os: darwin x64

Repro steps.

new project with angular-cli, add some code in app.component.css like div{color: red}, run ng serve -sm

Desired functionality.

I'd love to work with css sourcemap or even modify css/scss source with chrome dev tools directly.