docs: function listItem(h, node, parent) {
      var children = node.children
      var head = children[0]
      var props = {}
      var single = false
      var result
      var container
  
      if (
          (!parent || !parent.loose) &&
          children.length === 1 &&
          head.type === 'paragraph'
      ) {
          single = true
      }
  
      result = all(h, single ? head : node)
  
      if (typeof node.checked === 'boolean') {
          if (!single && (!head || head.type !== 'paragraph')) {
              result.unshift(h(null, 'p', []))
          }
  
          container = single ? result : result[0].children
  
          if (container.length !== 0) {
              /* old start */
              // container.unshift(u('text', ' '))
              /* old end */
  
              /* new start */
              container.unshift(u('text', {position: createTextPosition(container, node)},' '))
              /* new end */
          }
  
          container.unshift(
              /* old start */
              /*
              h(null, 'input', {
                  type: 'checkbox',
                  checked: node.checked,
                  disabled: true
              })
              */
              /* old end */
  
  
              /* new start */
              h({
                  position: createInputPosition(container, node)
              }, 'input', {
                  type: 'checkbox',
                  checked: node.checked,
                  disabled: true
              })
              /* new end */
          )
  
          // According to github-markdown-css, this class hides bullet.
          props.className = ['task-list-item']
      }
  
      if (!single && result.length !== 0) {
          result = wrap(result, true)
      }
  
      return h(node, 'li', props, result)
  }