use directories for structure

node_modules/bootstrap/scss/mixins/_background-variant.scss

@@ -15,8 +15,9 @@
   @include deprecate("The `bg-variant` mixin", "v4.4.0", "v5", $ignore-warning);
 }
 
-@mixin bg-gradient-variant($parent, $color) {
+@mixin bg-gradient-variant($parent, $color, $ignore-warning: false) {
   #{$parent} {
     background: $color linear-gradient(180deg, mix($body-bg, $color, 15%), $color) repeat-x !important;
   }
+  @include deprecate("The `bg-gradient-variant` mixin", "v4.5.0", "v5", $ignore-warning);
 }

node_modules/bootstrap/scss/mixins/_border-radius.scss

@@ -1,9 +1,22 @@
 // stylelint-disable property-blacklist
 // Single side border-radius
 
+// Helper function to replace negative values with 0
+@function valid-radius($radius) {
+  $return: ();
+  @each $value in $radius {
+    @if type-of($value) == number {
+      $return: append($return, max($value, 0));
+    } @else {
+      $return: append($return, $value);
+    }
+  }
+  @return $return;
+}
+
 @mixin border-radius($radius: $border-radius, $fallback-border-radius: false) {
   @if $enable-rounded {
-    border-radius: $radius;
+    border-radius: valid-radius($radius);
   }
   @else if $fallback-border-radius != false {
     border-radius: $fallback-border-radius;
@@ -12,52 +25,52 @@
 
 @mixin border-top-radius($radius) {
   @if $enable-rounded {
-    border-top-left-radius: $radius;
-    border-top-right-radius: $radius;
+    border-top-left-radius: valid-radius($radius);
+    border-top-right-radius: valid-radius($radius);
   }
 }
 
 @mixin border-right-radius($radius) {
   @if $enable-rounded {
-    border-top-right-radius: $radius;
-    border-bottom-right-radius: $radius;
+    border-top-right-radius: valid-radius($radius);
+    border-bottom-right-radius: valid-radius($radius);
   }
 }
 
 @mixin border-bottom-radius($radius) {
   @if $enable-rounded {
-    border-bottom-right-radius: $radius;
-    border-bottom-left-radius: $radius;
+    border-bottom-right-radius: valid-radius($radius);
+    border-bottom-left-radius: valid-radius($radius);
   }
 }
 
 @mixin border-left-radius($radius) {
   @if $enable-rounded {
-    border-top-left-radius: $radius;
-    border-bottom-left-radius: $radius;
+    border-top-left-radius: valid-radius($radius);
+    border-bottom-left-radius: valid-radius($radius);
   }
 }
 
 @mixin border-top-left-radius($radius) {
   @if $enable-rounded {
-    border-top-left-radius: $radius;
+    border-top-left-radius: valid-radius($radius);
   }
 }
 
 @mixin border-top-right-radius($radius) {
   @if $enable-rounded {
-    border-top-right-radius: $radius;
+    border-top-right-radius: valid-radius($radius);
   }
 }
 
 @mixin border-bottom-right-radius($radius) {
   @if $enable-rounded {
-    border-bottom-right-radius: $radius;
+    border-bottom-right-radius: valid-radius($radius);
   }
 }
 
 @mixin border-bottom-left-radius($radius) {
   @if $enable-rounded {
-    border-bottom-left-radius: $radius;
+    border-bottom-left-radius: valid-radius($radius);
   }
 }

node_modules/bootstrap/scss/mixins/_buttons.scss

@@ -20,10 +20,10 @@
     color: color-yiq($hover-background);
     @include gradient-bg($hover-background);
     border-color: $hover-border;
-    // Avoid using mixin so we can pass custom focus shadow properly
     @if $enable-shadows {
-      box-shadow: $btn-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
+      @include box-shadow($btn-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5));
     } @else {
+      // Avoid using mixin so we can pass custom focus shadow properly
       box-shadow: 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
     }
   }
@@ -51,10 +51,10 @@
     border-color: $active-border;
 
     &:focus {
-      // Avoid using mixin so we can pass custom focus shadow properly
       @if $enable-shadows and $btn-active-box-shadow != none {
-        box-shadow: $btn-active-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
+        @include box-shadow($btn-active-box-shadow, 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5));
       } @else {
+        // Avoid using mixin so we can pass custom focus shadow properly
         box-shadow: 0 0 0 $btn-focus-width rgba(mix(color-yiq($background), $border, 15%), .5);
       }
     }
@@ -90,10 +90,10 @@
     border-color: $active-border;
 
     &:focus {
-      // Avoid using mixin so we can pass custom focus shadow properly
       @if $enable-shadows and $btn-active-box-shadow != none {
-        box-shadow: $btn-active-box-shadow, 0 0 0 $btn-focus-width rgba($color, .5);
+        @include box-shadow($btn-active-box-shadow, 0 0 0 $btn-focus-width rgba($color, .5));
       } @else {
+        // Avoid using mixin so we can pass custom focus shadow properly
         box-shadow: 0 0 0 $btn-focus-width rgba($color, .5);
       }
     }

node_modules/bootstrap/scss/mixins/_forms.scss

@@ -16,10 +16,10 @@
     background-color: $input-focus-bg;
     border-color: $input-focus-border-color;
     outline: 0;
-    // Avoid using mixin so we can pass custom focus shadow properly
     @if $enable-shadows {
-      box-shadow: $input-box-shadow, $input-focus-box-shadow;
+      @include box-shadow($input-box-shadow, $input-focus-box-shadow);
     } @else {
+      // Avoid using mixin so we can pass custom focus shadow properly
       box-shadow: $input-focus-box-shadow;
     }
   }

node_modules/bootstrap/scss/mixins/_grid-framework.scss

@@ -15,12 +15,15 @@
   @each $breakpoint in map-keys($breakpoints) {
     $infix: breakpoint-infix($breakpoint, $breakpoints);
 
-    // Allow columns to stretch full width below their breakpoints
-    @for $i from 1 through $columns {
-      .col#{$infix}-#{$i} {
-        @extend %grid-column;
+    @if $columns > 0 {
+      // Allow columns to stretch full width below their breakpoints
+      @for $i from 1 through $columns {
+        .col#{$infix}-#{$i} {
+          @extend %grid-column;
+        }
       }
     }
+
     .col#{$infix},
     .col#{$infix}-auto {
       @extend %grid-column;
@@ -31,12 +34,15 @@
       .col#{$infix} {
         flex-basis: 0;
         flex-grow: 1;
+        min-width: 0; // See https://github.com/twbs/bootstrap/issues/25410
         max-width: 100%;
       }
 
-      @for $i from 1 through $grid-row-columns {
-        .row-cols#{$infix}-#{$i} {
-          @include row-cols($i);
+      @if $grid-row-columns > 0 {
+        @for $i from 1 through $grid-row-columns {
+          .row-cols#{$infix}-#{$i} {
+            @include row-cols($i);
+          }
         }
       }
 
@@ -44,9 +50,11 @@
         @include make-col-auto();
       }
 
-      @for $i from 1 through $columns {
-        .col#{$infix}-#{$i} {
-          @include make-col($i, $columns);
+      @if $columns > 0 {
+        @for $i from 1 through $columns {
+          .col#{$infix}-#{$i} {
+            @include make-col($i, $columns);
+          }
         }
       }
 
@@ -58,11 +66,13 @@
         .order#{$infix}-#{$i} { order: $i; }
       }
 
-      // `$columns - 1` because offsetting by the width of an entire row isn't possible
-      @for $i from 0 through ($columns - 1) {
-        @if not ($infix == "" and $i == 0) { // Avoid emitting useless .offset-0
-          .offset#{$infix}-#{$i} {
-            @include make-col-offset($i, $columns);
+      @if $columns > 0 {
+        // `$columns - 1` because offsetting by the width of an entire row isn't possible
+        @for $i from 0 through ($columns - 1) {
+          @if not ($infix == "" and $i == 0) { // Avoid emitting useless .offset-0
+            .offset#{$infix}-#{$i} {
+              @include make-col-offset($i, $columns);
+            }
           }
         }
       }

node_modules/bootstrap/scss/mixins/_transition.scss

@@ -1,16 +1,26 @@
 // stylelint-disable property-blacklist
 @mixin transition($transition...) {
-  @if $enable-transitions {
-    @if length($transition) == 0 {
-      transition: $transition-base;
-    } @else {
-      transition: $transition;
+  @if length($transition) == 0 {
+    $transition: $transition-base;
+  }
+
+  @if length($transition) > 1 {
+    @each $value in $transition {
+      @if $value == null or $value == none {
+        @warn "The keyword 'none' or 'null' must be used as a single argument.";
+      }
     }
   }
 
-  @if $enable-prefers-reduced-motion-media-query {
-    @media (prefers-reduced-motion: reduce) {
-      transition: none;
+  @if $enable-transitions {
+    @if nth($transition, 1) != null {
+      transition: $transition;
+    }
+
+    @if $enable-prefers-reduced-motion-media-query and nth($transition, 1) != null and nth($transition, 1) != none {
+      @media (prefers-reduced-motion: reduce) {
+        transition: none;
+      }
     }
   }
 }