Server bundle skip sourcemap generation

[glebmachine]

Versions

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
                |___/
    

Angular CLI: 6.0.0
Node: 8.11.1
OS: darwin x64
Angular: 6.0.0
... animations, cli, common, compiler, compiler-cli, core, forms
... http, language-service, platform-browser
... platform-browser-dynamic, platform-server, router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.6.0
@angular-devkit/build-angular     0.6.0
@angular-devkit/build-optimizer   0.6.0
@angular-devkit/core              0.6.0
@angular-devkit/schematics        0.6.0
@ngtools/webpack                  6.0.0
@schematics/angular               0.6.0
@schematics/update                0.6.0
rxjs                              6.1.0
typescript                        2.7.2
webpack                           4.6.0

Repro steps

https://github.com/glebmachine/angular6-no-sourcemaps

Steps to reproduce:

1. git clone git@github.com:glebmachine/angular6-no-sourcemaps.git
2. cd angular6-no-sourcemaps
3. yarn
4. ng run learn-angular6:server

P.S. Repro based on this story: https://github.com/angular/angular-cli/wiki/stories-universal-rendering
Architect server has "sourceMap": true

Observed behavior

I've run building server bundle with sourceMap:true, but no sourcemap produced

Desired behavior

I would like to have sourcemaps in server bundle like i have in browser bundle

Mention any other details that might be useful (optional)

I experiencing this issue about half a year.

[glebmachine]

Great! Thank you guys)

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