ant-design/components/timeline/TimelineItem.jsx

import React from 'react';
import classNames from 'classnames';

export default class TimelineItem extends React.Component {
  static defaultProps = {
    prefixCls: 'ant-timeline',
    color: 'blue',
    last: false,
    pending: false,
  }

  render() {
    const { prefixCls, color, last, children, pending, className, dot, ...restProps } = this.props;

    const itemClassName = classNames({
      [`${prefixCls}-item`]: true,
      [`${prefixCls}-item-last`]: last,
      [`${prefixCls}-item-pending`]: pending,
      [className]: className,
    });

    const dotClassName = classNames({
      [`${prefixCls}-item-head`]: true,
      [`${prefixCls}-item-head-custom`]: dot,
      [`${prefixCls}-item-head-${color}`]: true,
    });

    return (
      <li {...restProps} className={itemClassName}>
        <div className={`${prefixCls}-item-tail`} />
        <div
          className={dotClassName}
          style={{ borderColor: /blue|red|green/.test(color) ? null : color }}
        >
          {dot}
        </div>
        <div className={`${prefixCls}-item-content`}>
          {children}
        </div>
      </li>
    );
  }
}