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

@import '../../style/mixins/index';

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

.antTreeSwitcherIcon(@type: 'tree-default-open-icon') {
  .@{tree-prefix-cls}-switcher-icon,
  .@{select-tree-prefix-cls}-switcher-icon {
    .iconfont-size-under-12px(10px);

    display: inline-block;
    font-weight: bold;
    svg {
      transition: transform 0.3s;
    }
  }
}

.antTreeShowLineIcon(@type) {
  .@{tree-prefix-cls}-switcher-icon,
  .@{tree-select-prefix-cls}-switcher-icon {
    display: inline-block;
    font-weight: normal;
    font-size: 12px;
    svg {
      transition: transform 0.3s;
    }
  }
}