Support css, scss, and less

[ony3000]

This PR closes #136.

[Copilot]

Pull request overview

Adds first-class Prettier parser support for CSS-family languages so the plugin can wrap class lists inside Tailwind @apply directives in css/scss/less, addressing issue #136.

Changes:

• Register css, scss, and less parsers using Prettier’s postcss plugin parsers.
• Route css/scss/less AST processing through the CSS @apply node finder in the core processor.
• Add extensive Vitest snapshot coverage for @apply wrapping across CSS/SCSS/Less (selectors, pseudo-classes/elements, nesting, ignore comments, etc.).

Reviewed changes

Copilot reviewed 158 out of 159 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
src/parsers.ts	Adds css/scss/less parser entries backed by prettier/plugins/postcss parsers.
src/core-parts/processor.ts	Enables CSS-family parsers to use the CSS AST finder for @apply.
global.d.ts	Extends supported parser name union with css/scss/less.
tests/scss/selector/relative.test.ts	SCSS selector snapshot test harness (relative ending).
tests/scss/selector/absolute.test.ts	SCSS selector snapshot test harness (absolute ending).
tests/scss/selector/fixtures.ts	SCSS selector fixtures using @apply in various selector forms.
tests/scss/selector/snapshots/relative.test.ts.snap	SCSS selector expected output snapshots (relative).
tests/scss/selector/snapshots/absolute.test.ts.snap	SCSS selector expected output snapshots (absolute).
tests/scss/pseudo-element/relative.test.ts	SCSS pseudo-element snapshot test harness (relative).
tests/scss/pseudo-element/absolute.test.ts	SCSS pseudo-element snapshot test harness (absolute).
tests/scss/pseudo-element/fixtures.ts	SCSS pseudo-element fixtures with @apply.
tests/scss/pseudo-element/snapshots/relative.test.ts.snap	SCSS pseudo-element snapshots (relative).
tests/scss/pseudo-element/snapshots/absolute.test.ts.snap	SCSS pseudo-element snapshots (absolute).
tests/scss/pseudo-class/relative.test.ts	SCSS pseudo-class snapshot test harness (relative).
tests/scss/pseudo-class/absolute.test.ts	SCSS pseudo-class snapshot test harness (absolute).
tests/scss/pseudo-class/fixtures.ts	SCSS pseudo-class fixtures with @apply.
tests/scss/pseudo-class/snapshots/relative.test.ts.snap	SCSS pseudo-class snapshots (relative).
tests/scss/pseudo-class/snapshots/absolute.test.ts.snap	SCSS pseudo-class snapshots (absolute).
tests/scss/prettier-ignore/relative.test.ts	SCSS prettier-ignore snapshot test harness (relative).
tests/scss/prettier-ignore/absolute.test.ts	SCSS prettier-ignore snapshot test harness (absolute).
tests/scss/prettier-ignore/fixtures.ts	SCSS fixtures validating prettier-ignore behavior around @apply.
tests/scss/prettier-ignore/snapshots/relative.test.ts.snap	SCSS prettier-ignore snapshots (relative).
tests/scss/prettier-ignore/snapshots/absolute.test.ts.snap	SCSS prettier-ignore snapshots (absolute).
tests/scss/others/relative.test.ts	SCSS “other options” snapshot test harness (relative).
tests/scss/others/absolute.test.ts	SCSS “other options” snapshot test harness (absolute).
tests/scss/others/fixtures.ts	SCSS fixtures for tabWidth/useTabs/endOfLine with @apply.
tests/scss/others/snapshots/relative.test.ts.snap	SCSS “others” snapshots (relative).
tests/scss/others/snapshots/absolute.test.ts.snap	SCSS “others” snapshots (absolute).
tests/scss/nesting/relative.test.ts	SCSS nesting snapshot test harness (relative).
tests/scss/nesting/absolute.test.ts	SCSS nesting snapshot test harness (absolute).
tests/scss/nesting/fixtures.ts	SCSS nesting fixtures with @apply.
tests/scss/nesting/snapshots/relative.test.ts.snap	SCSS nesting snapshots (relative).
tests/scss/nesting/snapshots/absolute.test.ts.snap	SCSS nesting snapshots (absolute).
tests/scss/mixin/relative.test.ts	SCSS mixin snapshot test harness (relative).
tests/scss/mixin/absolute.test.ts	SCSS mixin snapshot test harness (absolute).
tests/scss/mixin/fixtures.ts	SCSS mixin fixtures with @apply.
tests/scss/mixin/snapshots/relative.test.ts.snap	SCSS mixin snapshots (relative).
tests/scss/mixin/snapshots/absolute.test.ts.snap	SCSS mixin snapshots (absolute).
tests/scss/inheritance/relative.test.ts	SCSS inheritance snapshot test harness (relative).
tests/scss/inheritance/absolute.test.ts	SCSS inheritance snapshot test harness (absolute).
tests/scss/inheritance/fixtures.ts	SCSS inheritance fixtures with @apply.
tests/scss/inheritance/snapshots/relative.test.ts.snap	SCSS inheritance snapshots (relative).
tests/scss/inheritance/snapshots/absolute.test.ts.snap	SCSS inheritance snapshots (absolute).
tests/scss/combinator/relative.test.ts	SCSS combinator snapshot test harness (relative).
tests/scss/combinator/absolute.test.ts	SCSS combinator snapshot test harness (absolute).
tests/scss/combinator/fixtures.ts	SCSS combinator fixtures with @apply.
tests/scss/combinator/snapshots/relative.test.ts.snap	SCSS combinator snapshots (relative).
tests/scss/combinator/snapshots/absolute.test.ts.snap	SCSS combinator snapshots (absolute).
tests/scss/at-rule/relative.test.ts	SCSS at-rule snapshot test harness (relative).
tests/scss/at-rule/absolute.test.ts	SCSS at-rule snapshot test harness (absolute).
tests/less/variable/relative.test.ts	Less variable snapshot test harness (relative).
tests/less/variable/absolute.test.ts	Less variable snapshot test harness (absolute).
tests/less/variable/fixtures.ts	Less variable interpolation fixtures with @apply.
tests/less/variable/snapshots/relative.test.ts.snap	Less variable snapshots (relative).
tests/less/variable/snapshots/absolute.test.ts.snap	Less variable snapshots (absolute).
tests/less/selector/relative.test.ts	Less selector snapshot test harness (relative).
tests/less/selector/absolute.test.ts	Less selector snapshot test harness (absolute).
tests/less/selector/fixtures.ts	Less selector fixtures with @apply.
tests/less/selector/snapshots/relative.test.ts.snap	Less selector snapshots (relative).
tests/less/selector/snapshots/absolute.test.ts.snap	Less selector snapshots (absolute).
tests/less/pseudo-element/relative.test.ts	Less pseudo-element snapshot test harness (relative).
tests/less/pseudo-element/absolute.test.ts	Less pseudo-element snapshot test harness (absolute).
tests/less/pseudo-element/fixtures.ts	Less pseudo-element fixtures with @apply.
tests/less/pseudo-element/snapshots/relative.test.ts.snap	Less pseudo-element snapshots (relative).
tests/less/pseudo-element/snapshots/absolute.test.ts.snap	Less pseudo-element snapshots (absolute).
tests/less/pseudo-class/relative.test.ts	Less pseudo-class snapshot test harness (relative).
tests/less/pseudo-class/absolute.test.ts	Less pseudo-class snapshot test harness (absolute).
tests/less/pseudo-class/fixtures.ts	Less pseudo-class fixtures with @apply.
tests/less/pseudo-class/snapshots/relative.test.ts.snap	Less pseudo-class snapshots (relative).
tests/less/pseudo-class/snapshots/absolute.test.ts.snap	Less pseudo-class snapshots (absolute).
tests/less/prettier-ignore/relative.test.ts	Less prettier-ignore snapshot test harness (relative).
tests/less/prettier-ignore/absolute.test.ts	Less prettier-ignore snapshot test harness (absolute).
tests/less/prettier-ignore/fixtures.ts	Less fixtures validating prettier-ignore behavior around @apply.
tests/less/prettier-ignore/snapshots/relative.test.ts.snap	Less prettier-ignore snapshots (relative).
tests/less/prettier-ignore/snapshots/absolute.test.ts.snap	Less prettier-ignore snapshots (absolute).
tests/less/parent-selector/relative.test.ts	Less parent selector snapshot test harness (relative).
tests/less/parent-selector/absolute.test.ts	Less parent selector snapshot test harness (absolute).
tests/less/parent-selector/fixtures.ts	Less parent selector fixtures with @apply.
tests/less/parent-selector/snapshots/relative.test.ts.snap	Less parent selector snapshots (relative).
tests/less/parent-selector/snapshots/absolute.test.ts.snap	Less parent selector snapshots (absolute).
tests/less/others/relative.test.ts	Less “other options” snapshot test harness (relative).
tests/less/others/absolute.test.ts	Less “other options” snapshot test harness (absolute).
tests/less/others/fixtures.ts	Less fixtures for tabWidth/useTabs/endOfLine with @apply.
tests/less/others/snapshots/relative.test.ts.snap	Less “others” snapshots (relative).
tests/less/others/snapshots/absolute.test.ts.snap	Less “others” snapshots (absolute).
tests/less/mixin/relative.test.ts	Less mixin snapshot test harness (relative).
tests/less/mixin/absolute.test.ts	Less mixin snapshot test harness (absolute).
tests/less/mixin/fixtures.ts	Less mixin fixtures with @apply.
tests/less/mixin/snapshots/relative.test.ts.snap	Less mixin snapshots (relative).
tests/less/mixin/snapshots/absolute.test.ts.snap	Less mixin snapshots (absolute).
tests/less/map/relative.test.ts	Less map snapshot test harness (relative).
tests/less/map/absolute.test.ts	Less map snapshot test harness (absolute).
tests/less/map/fixtures.ts	Less map fixtures with @apply and media queries.
tests/less/map/snapshots/relative.test.ts.snap	Less map snapshots (relative).
tests/less/map/snapshots/absolute.test.ts.snap	Less map snapshots (absolute).
tests/less/extend/relative.test.ts	Less extend snapshot test harness (relative).
tests/less/extend/absolute.test.ts	Less extend snapshot test harness (absolute).
tests/less/extend/fixtures.ts	Less extend fixtures with @apply across extend scenarios.
tests/less/extend/snapshots/relative.test.ts.snap	Less extend snapshots (relative).
tests/less/extend/snapshots/absolute.test.ts.snap	Less extend snapshots (absolute).
tests/less/detached-ruleset/relative.test.ts	Less detached ruleset snapshot test harness (relative).
tests/less/detached-ruleset/absolute.test.ts	Less detached ruleset snapshot test harness (absolute).
tests/less/detached-ruleset/fixtures.ts	Less detached ruleset fixtures with @apply.
tests/less/detached-ruleset/snapshots/relative.test.ts.snap	Less detached ruleset snapshots (relative).
tests/less/detached-ruleset/snapshots/absolute.test.ts.snap	Less detached ruleset snapshots (absolute).
tests/less/css-guard/relative.test.ts	Less CSS guard snapshot test harness (relative).
tests/less/css-guard/absolute.test.ts	Less CSS guard snapshot test harness (absolute).
tests/less/css-guard/fixtures.ts	Less CSS guard fixtures with @apply.
tests/less/css-guard/snapshots/relative.test.ts.snap	Less CSS guard snapshots (relative).
tests/less/css-guard/snapshots/absolute.test.ts.snap	Less CSS guard snapshots (absolute).
tests/less/combinator/relative.test.ts	Less combinator snapshot test harness (relative).
tests/less/combinator/absolute.test.ts	Less combinator snapshot test harness (absolute).
tests/less/combinator/fixtures.ts	Less combinator fixtures with @apply.
tests/less/combinator/snapshots/relative.test.ts.snap	Less combinator snapshots (relative).
tests/less/combinator/snapshots/absolute.test.ts.snap	Less combinator snapshots (absolute).
tests/less/at-rule/relative.test.ts	Less at-rule snapshot test harness (relative).
tests/less/at-rule/absolute.test.ts	Less at-rule snapshot test harness (absolute).
tests/css/selector/relative.test.ts	CSS selector snapshot test harness (relative).
tests/css/selector/absolute.test.ts	CSS selector snapshot test harness (absolute).
tests/css/selector/fixtures.ts	CSS selector fixtures using @apply in various selector forms.
tests/css/selector/snapshots/relative.test.ts.snap	CSS selector snapshots (relative).
tests/css/selector/snapshots/absolute.test.ts.snap	CSS selector snapshots (absolute).
tests/css/pseudo-element/relative.test.ts	CSS pseudo-element snapshot test harness (relative).
tests/css/pseudo-element/absolute.test.ts	CSS pseudo-element snapshot test harness (absolute).
tests/css/pseudo-element/fixtures.ts	CSS pseudo-element fixtures with @apply.
tests/css/pseudo-element/snapshots/relative.test.ts.snap	CSS pseudo-element snapshots (relative).
tests/css/pseudo-element/snapshots/absolute.test.ts.snap	CSS pseudo-element snapshots (absolute).
tests/css/pseudo-class/relative.test.ts	CSS pseudo-class snapshot test harness (relative).
tests/css/pseudo-class/absolute.test.ts	CSS pseudo-class snapshot test harness (absolute).
tests/css/pseudo-class/fixtures.ts	CSS pseudo-class fixtures with @apply.
tests/css/pseudo-class/snapshots/relative.test.ts.snap	CSS pseudo-class snapshots (relative).
tests/css/pseudo-class/snapshots/absolute.test.ts.snap	CSS pseudo-class snapshots (absolute).
tests/css/prettier-ignore/relative.test.ts	CSS prettier-ignore snapshot test harness (relative).
tests/css/prettier-ignore/absolute.test.ts	CSS prettier-ignore snapshot test harness (absolute).
tests/css/prettier-ignore/fixtures.ts	CSS fixtures validating prettier-ignore behavior around @apply.
tests/css/prettier-ignore/snapshots/relative.test.ts.snap	CSS prettier-ignore snapshots (relative).
tests/css/prettier-ignore/snapshots/absolute.test.ts.snap	CSS prettier-ignore snapshots (absolute).
tests/css/others/relative.test.ts	CSS “other options” snapshot test harness (relative).
tests/css/others/absolute.test.ts	CSS “other options” snapshot test harness (absolute).
tests/css/others/fixtures.ts	CSS fixtures for tabWidth/useTabs/endOfLine with @apply.
tests/css/others/snapshots/relative.test.ts.snap	CSS “others” snapshots (relative).
tests/css/others/snapshots/absolute.test.ts.snap	CSS “others” snapshots (absolute).
tests/css/combinator/relative.test.ts	CSS combinator snapshot test harness (relative).
tests/css/combinator/absolute.test.ts	CSS combinator snapshot test harness (absolute).
tests/css/combinator/fixtures.ts	CSS combinator fixtures with @apply.
tests/css/combinator/snapshots/relative.test.ts.snap	CSS combinator snapshots (relative).
tests/css/combinator/snapshots/absolute.test.ts.snap	CSS combinator snapshots (absolute).
tests/css/at-rule/relative.test.ts	CSS at-rule snapshot test harness (relative).
tests/css/at-rule/absolute.test.ts	CSS at-rule snapshot test harness (absolute).

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