v4.2.2

#4290 Fix #4268 nested pseudo-selector parsing (@puckowski)
#4291 Enhance Less.js test environment setup (#4291) (@iChenLei)
#4295 Fix #4252 container queries created via mixin evaluating variables incorrectly (@puckowski)
#4294 Fix #3737 allow blank variable declarationd (@puckowski)
#4292 Fix #4258 variable interpolation after math (@puckowski)
#4293 Fix #4264 strip line comment from expression (@puckowski)
#4302 Fix #4301 at-rule declarations missing (@puckowski)
#4309 Fix Node 23 CI (#4309) (@iChenLei)

v4.2.1

• #4235 Fix container style queries extra space resolved (@puckowski)

v4.2.0

• #3811 add support for container queries (@puckowski)
• #3761 fix faulty source map generation with variables in selectors, fixes #3567 (@pgoldberg)
• #3700 parsing variables fail when there is no trailing semicolon (@b-kelly)
• #3719 modify this pointer so that it is not empty. (@lumburr)
• #3649 fixes #2991 empty @media queries generated when compiling less file with (reference) to bootstrap (@MoonCoral)

v4.1.3

• #3673 Feat: add support for case-insensitive attribute selectors (#3673) (@iChenLei)
• #3710 Feat: add disablePluginRule flag for render() options (#3710) (@broofa @edhgoose)
• #3656 Fix #3655 for param tag is null (#3658) (@langren1353)
• #3658 Fix #3646 forcefully change unsupported input to strings (#3658) (@gzb1128)
• #3668 Fix change keyword plugin and import regexp (#3668) (@iChenLei)
• #3613 Fix #3591: refactor debugInfo from class to function (#3613) (@drdevlin)
• #3716 Fix https failures on macOS (#3716) (@joeyparrish)

v4.1.2

• #3602 Fix currentFileInfo and index properties on nodes (#3602) (@bjpbakker)
• #3626 Fix #3616 IfStatement requires double parentheses when dividing (#3626) (@iChenLei)
• #3630 Fix needle dependency warning typo. (#3630) (@cjwilsontech)

v4.1.1

• #3597 Fix expected response when there's a socket error (#3597) (@zxfrank)
• #3589 Fixes #3586 (#3589) (@matthew-dean)

v4.1.0

Mixin parentheses requirement removed

This was maybe too big a change without some kind of deprecation or conversion.
So for this version, this works again:

.mixin;

• #3582 Fix #3576 import redirects. Replace native-request with needle. (#3582) (@zaquest)
• #3583 Update rollup and other build dependencies (#3583) (@pravi)
• #3588 Roll back paren requirement on mixin calls (#3588) (@matthew-dean)

v4.0.0

This release has 2 breaking changes:

Parentheses required for mixin calls

This aligns it with syntax for calling detached rulesets.

Example

.mixin() {}
.mixin;  // error in 4.0

Parens-division now the default math setting

Parentheses are required (by default) around division-like expressions, to force math evaluation.

Example:

@ratio_large: 16;
@ratio_small: 9;

/** The following will produce `device-aspect-ratio: 1.77777778` by default in 3.x */
@media all and (device-aspect-ratio: @ratio_large / @ratio_small) {
   .body { max-width: 800px; }
}

Produces:

@media all and (device-aspect-ratio: 16 / 9) {
  .body {
    max-width: 800px;
  }
}

You can, of course, get old math behavior. See: http://lesscss.org/usage/#less-options-math

What's New

• min() / max() functions can pass-through if it cannot be evaluated in Less
• isdefined() can be used to test if variables are defined (e.g. isdefined(@unknown))
• New rgb color syntax supported (e.g. rgb(0 128 255 / 50%))

2.5.1

• Fix problems with less being async in some browsers
• Minor fix only likely to affect programmatic usage of ruleset find
• Fix error when a namespaced mixin is invoked in global scope