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Use Dart Sass

Administrator requested to merge dart-sass into master

Created by: felixfbecker

sass-loader recommends using Dart Sass, which has become the official Sass implementation, as opposed to node-sass (libsass).

  • No Node native addons, which means easier Node version upgrades
  • Potentially solve some of the build flakiness (we don't know the root cause, but the errors always occur with node-sass)
  • More precise float division
  • Get new Sass features faster

But it is slightly slower. Build time sampled of enterprise web build from master (BEFORE), in seconds:

Count             : 100
Average           : 188.28016
Sum               : 18828.016
Maximum           : 283.475
Minimum           : 155.124
StandardDeviation : 30.953466408162
Property          :

On this branch (AFTER):

Count             : 6
Average           : 205.923166666667
Sum               : 1235.539
Maximum           : 254.762
Minimum           : 163.391
StandardDeviation : 37.7923489739215
Property          :

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