lastest

node_modules/bootstrap/scss/_transitions.scss

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+.fade {
+  @include transition($transition-fade);
+
+  &:not(.show) {
+    opacity: 0;
+  }
+}
+
+// scss-docs-start collapse-classes
+.collapse {
+  &:not(.show) {
+    display: none;
+  }
+}
+
+.collapsing {
+  height: 0;
+  overflow: hidden;
+  @include transition($transition-collapse);
+
+  &.collapse-horizontal {
+    width: 0;
+    height: auto;
+    @include transition($transition-collapse-width);
+  }
+}
+// scss-docs-end collapse-classes