如何在nodejs，打字稿中通过xpath插入节点？

Question

我正在尝试编写一些代码以通过 xpath 将节点插入到通用配置中。
通常我在写 .Net 应用程序，但现在我需要在 nodejs 上编写工具，键入 script
我不明白怎么写对如何制作 **childNodes[0]** 以便我可以调用 **appendChild**？

import {DOMParser as dom} from "xmldom";
import * as xpath from "xpath";

export default class FileJob extends BaseJob {
    async execute(settings: JobSettings) {
            this.poke('C:\Temp\LocalCache\Config.xml','/Root','<DB-Connection id="development" database="development"/>');
    }

    private poke(path:fs.PathLike,pathToNode:string, node : string)
    {
        const file = fs.readFileSync(path,'utf-8');
        var doc = new dom().parseFromString(file);
        var tempDoc = new dom().parseFromString(node);
        var importedNode = doc.importNode(tempDoc.documentElement, true);
        var childNodes = xpath.select(pathToNode, doc);
        if (childNodes[0]!==undefined)
        {
            //What to do here?
            //Property 'appendChild' does not exist on type 'SelectedValue'.
            //Property 'appendChild' does not exist on type 'string'.
            childNodes[0].appendChild(importedNode);
            fs.writeFileSync(path,doc.toString());
        }
    }
}

Answer 1

我小时候傻
这是必要的。

import {DOMParser as dom} from "xmldom";
import * as xpath from "xpath";

export default class FileJob extends BaseJob {
    async execute(settings: JobSettings) {
            this.poke('C:\Temp\LocalCache\Config.xml','/Root','<DB-Connection id="development" database="development"/>');
    }

    private poke(path:fs.PathLike,pathToNode:string, node : string)
    {
        const file = fs.readFileSync(path,'utf-8');
        var doc = new dom().parseFromString(file);
        var tempDoc = new dom().parseFromString(node);
        var importedNode = doc.importNode(tempDoc.documentElement, true);
        var childNodes = xpath.select(pathToNode, doc);
        if (childNodes[0]!==undefined)
        {
          let currentNode = childNodes[0] as Node;
          currentNode.appendChild(importedNode);
          fs.writeFileSync(path,doc.toString());
        }
    }
}

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