ant-design/components/tree/style/rtl.less

@import '../../style/themes/index';
@import '../../style/mixins/index';
@import '../../checkbox/style/mixin';

@tree-prefix-cls: ~'@{ant-prefix}-tree';
@tree-node-prefix-cls: ~'@{tree-prefix-cls}-treenode';

.@{tree-prefix-cls} {
  &-rtl {
    direction: rtl;
  }

  // ===================== TreeNode =====================
  .@{tree-node-prefix-cls} {
    &-rtl {
      direction: rtl;
    }
  }

  // >>> Switcher
  & &-switcher {
    &_close {
      .@{tree-prefix-cls}-switcher-icon {
        svg {
          .@{tree-prefix-cls}-rtl& {
            transform: rotate(90deg);
          }
        }
      }
    }
  }
  // ==================== Show Line =====================
  &-show-line {
    // ================ Indent lines ================
    .@{tree-prefix-cls}-indent {
      &-unit {
        &::before {
          .@{tree-prefix-cls}-rtl& {
            right: auto;
            left: -@tree-title-height / 2;
            border-right: none;
            border-left: 1px solid @border-color-base;
          }
        }
      }
    }
  }
}