ng serve --prod --source-map does not produce source maps

[Maximaximum]

Versions

     _                      _                 ____ _     ___
    / \   _ __   __ _ _   _| | __ _ _ __     / ___| |   |_ _|
   / △ \ | '_ \ / _` | | | | |/ _` | '__|   | |   | |    | |
  / ___ \| | | | (_| | |_| | | (_| | |      | |___| |___ | |
 /_/   \_\_| |_|\__, |\__,_|_|\__,_|_|       \____|_____|___|
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Angular CLI: 6.0.1
Node: 8.9.4
OS: win32 x64
Angular: 6.0.1
... animations, cdk, cli, common, compiler, compiler-cli, core
... forms, http, language-service, material
... material-moment-adapter, platform-browser
... platform-browser-dynamic, platform-server, router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.6.1
@angular-devkit/build-angular     0.6.1
@angular-devkit/build-optimizer   0.6.1
@angular-devkit/core              0.6.1
@angular-devkit/schematics        0.6.1
@angular/flex-layout              5.0.0-beta.13
@ngtools/webpack                  6.0.1
@schematics/angular               0.6.1
@schematics/update                0.6.1
rxjs                              6.1.0
typescript                        2.7.2
webpack                           4.6.0

Repro steps

• Run ng serve --prod --source-map

Observed behavior

The ouput js and css bundles do not contain the source maps.

Desired behavior

The output bundles should contain the source maps, and the browser (Chrome) should recognize them.

Mention any other details that might be useful (optional)

[jmesa-sistel]

You can change it in angular.json in architect -> build -> "builder": "@angular-devkit/build-angular:browser" -> configurations -> production -> sourceMap

[Maximaximum]

Thank you, @jmesa-sistel. Indeed, it works. But:

1. Nowhere in the documentation could I find any information on this. It would be nice to add explicit documentation.
2. IMO, since there is a --source-map command-line flag, it should do something 😄 Anyway, it would be nice to have an ability to enable sourcemaps via CLI, without modifying the angular.json file.

[jmesa-sistel]

@Maximaximum
Docs about new schemas system:
https://github.com/angular/angular-cli/wiki/angular-workspace
To understand how it works I used a json online viewer to understand the organization.
I have to say that this new config system is very powerful, I usually had to eject the configuration, now it is not needed for me.
Seems that the angular.json configuration has precedence over cli parameters, with --prod you select production configuration so --source-map parameter is overwritten , maybe it is a bug, I do not know.

[Maximaximum]

@jmesa-sistel yeah, it looks like a bug to me, because otherwise I wonder what is the sense of having the command-line args at all, if they're overwritten by the config file.

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