hsl() not getting colorized

[PRR24]

According to documentation https://lesscss.org/functions/#color-definition-hsl
hsl() function should output a color, but it does not. rgb() and hsv() behave as documented.

$ npx lessc --version
lessc 4.1.1 (Less Compiler) [JavaScript]
$ cat problem.less 
.problem {
  color: rgb(128, 255, 0);
  background-color: hsl(90, 100%, 50%);
  border-color: hsv(90, 100%, 50%);
}
$ npx lessc problem.less 
.problem {
  color: #80ff00;
  background-color: hsl(90, 100%, 50%);
  border-color: #408000;
}

[PRR24]

Triangulated:

$ npx less@3.8.0 problem.less 
.problem {
  color: #80ff00;
  background-color: #80ff00;
  border-color: #408000;
}
$ npx less@3.8.1 problem.less 
.problem {
  color: #80ff00;
  background-color: hsl(90, 100%, 50%);
  border-color: #408000;
}

[matthew-dean]

Not sure what the issue is. hsl() is a valid color value in CSS. Less, in general, tries to preserve original color formats.

[matthew-dean]

@PRR24 If the issue is that it doesn't match documentation, it's more an issue of the documentation.

[PRR24]

Well, rgb() is also a valid color, but its gets converted nevertheless...
I don't mind hsl(), but problem is consistency. Currently some color functions return hsl while come return color.

@color-base: hsl(90, 100%, 50%);
@color-dark: darken(@color-base, 20%);
@color-avg: average(@color-base, @color-dark);

.problem {
  color: @color-base;
  background-color: @color-dark;
  border-color: @color-avg;
}
$ npx less@4.1.1 problem.less 
.problem {
  color: hsl(90, 100%, 50%);
  background-color: hsl(90, 100%, 30%);
  border-color: #66cc00;
}

If one has an additional use for the computed values, for example creating a color list for external use, it is bit of a mess.

If you find that hsl() handling in its current form is better (and there are understandable arguments for it), please adjust the documentation and concider adjusting all possible color functions to return computed value according to the format of its parameters, so that average() in the example above would return hsl(90, 100%, 40%)

Thanks.

[iChenLei]

All Color process logic located at packages/less/src/less/tree/color.js and packages/less/src/less/functions/color.js .

If you find that hsl() handling in its current form is better (and there are understandable arguments for it), please adjust the documentation and concider adjusting all possible color functions to return computed value according to the format of its parameters, so that average() in the example above would return hsl(90, 100%, 40%)

If you are interested in this work, please help us to improve less doc. Thanks

less doc repo -> https://github.com/less/less-docs , example PR less/less-docs#551

[arronKler]

There really have some updates about colors on v3.8.1. hsl() will keep instead of converting to hex color. The document (https://lesscss.org/functions/#color-definition-hsl) is outdated.

Changelog: https://github.com/less/less.js/blob/master/CHANGELOG.md#v381-2018-08-08
Related Pull request: #3291
Related Issue Comment: #3290 (comment)