Remove unused css during build

[zehavibarak]

Command

build

Description

It can be useful to be able to remove unused css styles during build, to reduce the overall size of the build. Our project mini css , for example, is as large as 11Mb due to 3rd party libraries of charts, etc.

Describe the solution you'd like

Such a feature may be setup in angular.json, with a collection of ignore list:

{
   "dropUnsedStyles": true,
   "keepStyles": ["my-css-decoration"]
}

Describe alternatives you've considered

webpack has such a plugin, needs some adjustments to work with ng build.

[alan-agius4]

Duplicate of #22809

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