Fix for issue #6338: Changed default value for sourceMap property of angulars webpack config

[aspidov]

Issue: #6338

What I did

changed value of sourceMap from {} to false

How to test

Create a project via latest angular-cli and add storybook, it will fail, because sourceMap property should be boolean

[vercel]

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[shilman]

@aspidov Is this backwards compatible? If so, how far back?

[aspidov]

@shilman , this property was itroduced in this commit angular/angular-cli@cde624a#diff-dffa709a67c66e298beea219faae843fR595 , and always was boolean. So yes, this is backwards compatible.

[aspidov]

@igor-dv @kroeder @shilman please let me know if you need any additional information.

[codecov]

Codecov Report

Merging #6535 into next will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             next    #6535   +/-   ##
=======================================
  Coverage   40.79%   40.79%           
=======================================
  Files         616      616           
  Lines        8525     8525           
  Branches      595      595           
=======================================
  Hits         3478     3478           
  Misses       4955     4955           
  Partials       92       92

Impacted Files	Coverage Δ
app/angular/src/server/angular-cli_config.js	39.53% <ø> (ø)	⬆️

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[ndelangen]

@yjcxy12 According to git you added this line, would you be able to pitch in here and see if the proposed change is correct too?