insertChildren()

in packages/core/src/models/TreeNode.ts [627:652]

• 26 lines of code
• 5 McCabe index (conditional complexity)

  insertChildren(start: number, ...nodes: TreeNode[]) {
    if (nodes.some((node) => node.contains(this))) return []
    if (this.children?.length) {
      const originSourceParents = nodes.map((node) => node.parent)
      const newNodes = this.resetNodesParent(nodes, this)
      if (!newNodes.length) return []
      return this.triggerMutation(
        new InsertChildrenEvent({
          originSourceParents,
          target: this,
          source: newNodes,
        }),
        () => {
          this.children = this.children.reduce((buf, node, index) => {
            if (index === start) {
              return buf.concat(newNodes).concat([node])
            }
            return buf.concat([node])
          }, [])
          return newNodes
        },
        []
      )
    }
    return []
  }