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input.scss

@use "sass:list";
@use "sass:map";
@use "sass:string";

/// Grid place simplifier
/// @param {List} $items (align, justify) - define align and justify position of grid items: {
///   start, end, center, stretch, baseline
/// }
/// @param {List} $content [false] (align, justify) - define align and justify position of
/// grid container in parent: {
///   start, end, center, stretch, space-around, space-between, space-evenly
/// }
/// e.g.: @include grid-place(unset end, center start) -> {
///   align-items: end;
///   place-content: start center;
/// }
@mixin grid-place($items, $content: false) {
  $attr: (
    "justify-items": false,
    "align-items": false,
    "place-items": false,
    "justify-content": false,
    "align-content": false,
    "place-content": false
  );
  $justify-items: start, end, center, stretch;
  $align-items: start, end, center, stretch;
  $place-items: $justify-items;
  $justify-content: start, end, center, stretch, space-around, 
    space-between, space-evenly;
  $align-content: start, end, center, stretch, space-around, 
    space-between, space-evenly;
  $place-content: $justify-content;
  
  @if length($items) < 2 {
    $attr: map.set($attr, "place-items", $items);
  } @else if length($items) == 2 {
    @if list.nth($items, 1) == "unset" {
      $attr: map.set($attr, "align-items", list.nth($items, 2));    
    } @else if list.nth($items, 2) == "unset" {
      $attr: map.set($attr, "justify-items", list.nth($items, 1));
    } @else {
      $attr: map.set($attr, "place-items", list.nth($items, 2) list.nth($items, 1));    
    }
  } @else {
    $length: list.length($items);

    @error "`#{$items}` may have a maximum of 2 properties. #{$length} found.";
  }
  @if $content {
    @if length($content) < 2 {
      $attr: map.set($attr, "place-content", $content);
    } @else if length($content) == 2 {
      @if list.nth($content, 1) == "unset" {
        $attr: map.set($attr, "align-content", list.nth($content, 2));      
      } @else if list.nth($content, 2) == "unset" {
        $attr: map.set($attr, "justify-content", list.nth($content, 1));  
      } @else {
        $attr: map.set($attr, "place-content", list.nth($content, 2) list.nth($content, 1));
      }
    } @else {
      $length: list.length($content);

      @error "`#{$content}` may have a maximum of 2 properties. #{$length} found.";
    }
  }
  
  @if map.get($attr, "justify-items") {
    @if not list.index($justify-items, map.get($attr, "justify-items")) {
      @error "#{map.get($attr, "justify-items")} is not valid " +
        "justify-items property. Expected on of #{$justify-items}.";
    }

    justify-items: map.get($attr, "justify-items");
  }
  @if map.get($attr, "align-items") {
    @if not list.index($align-items, map.get($attr, "align-items")) {
      @error "#{map.get($attr, "align-items")} is not valid " +
        "align-items property. Expected on of #{$align-items}.";
    }

    align-items: map.get($attr, "align-items");
  }
  @if map.get($attr, "place-items") {
    $map-items: map.get($attr, "place-items");
    @if length($map-items) == 2 {
      @if not list.index($place-items, list.nth($map-items, 1)) {
        @error "#{list.nth($map-items, 1)} is not valid " +
          "place-items property. Expected on of #{$place-items}.";
      }
      @if not list.index($place-items, list.nth($map-items, 2)) {
        @error "#{list.nth($map-items, 2)} is not valid " +
          "place-items property. Expected on of #{$place-items}.";
      }
    } @else {
      @if not list.index($place-items, map.get($attr, "place-items")) {
        @error "#{map.get($attr, "place-items")} is not valid " +
          "place-items property. Expected on of #{$place-items}.";
      }    
    }

    place-items: map.get($attr, "place-items");
  }
  @if map.get($attr, "justify-content") {
    @if not list.index($justify-content, map.get($attr, "justify-content")) {
      @error "#{map.get($attr, "justify-content")} is not valid " +
        "justify-content property. Expected on of #{$justify-content}.";
    }

    justify-content: map.get($attr, "justify-content");
  }
  @if map.get($attr, "align-content") {
    @if not list.index($align-content, map.get($attr, "align-content")) {
      @error "#{map.get($attr, "align-content")} is not valid " +
        "align-content property. Expected on of #{$align-content}.";
    }

    align-content: map.get($attr, "align-content");
  }
  @if map.get($attr, "place-content") {
    $map-items: map.get($attr, "place-content");
    @if length($map-items) == 2 {
      @if not list.index($place-content, list.nth($map-items, 1)) {
        @error "#{list.nth($map-items, 1)} is not valid " +
          "place-content property. Expected on of #{$place-content}.";
      }
      @if not list.index($place-content, list.nth($map-items, 2)) {
        @error "#{list.nth($map-items, 2)} is not valid " +
          "place-content property. Expected on of #{$place-content}.";
      }
    } @else {
      @if not list.index($place-content, map.get($attr, "place-content")) {
        @error "#{map.get($attr, "place-content")} is not valid " +
          "place-content property. Expected on of #{$place-content}.";
      }    
    }

    place-content: map.get($attr, "place-content");
  }
}

.test {
  display: grid;
  @include grid-place(unset end, center start);
}

output.css

.test {
  display: grid;
  align-items: end;
  place-content: start center;
}

settings.json

{
  "sass": {
    "compiler": "dart-sass/1.32.12",
    "extensions": {},
    "syntax": "SCSS",
    "outputStyle": "expanded"
  },
  "autoprefixer": false
}