Error tracing on production

[talhakazmi]

Versions

<!--
Output from: `ng --version`.
@angular/cli: 1.5.2
@angular/material: 5.0.3
@angular-devkit/build-optimizer: 0.0.33
@angular-devkit/core: 0.0.20
@angular-devkit/schematics: 0.0.36
@ngtools/json-schema: 1.1.0
@ngtools/webpack: 1.8.2
@schematics/angular: 0.1.5
typescript: 2.2.2
webpack: 3.8.1

  Windows (10)
-->

Repro steps

I have applied error tracing on development build which shows proper file and line because of sourcemap files as they do exist on development but when i tried the same code on production built, the file showed up is UglifyJs and couldn't understand the line and code.
i can use --sourcemap flag to get the sourcemap on production but i don't want my users to view sourcemap. is there any way i can get proper file and line of error in production without sourcemap

[talhakazmi]

I have also tried to generate map iles in production with flag --sourcemap and move them on restricted domain which only i can access but so error produced on my machine shows proper file and line number but on other users it wont show.
but i don't want this i have created an error logging file and want to log error with error trace produced on user end.

[alan-agius4]

Closing in favor of #12375

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