method XmlNode.prototype.firstimport { XmlNode } from "https://deno.land/x/aws_api@v0.5.0/encoding/xml.ts"; first(name: string, required: true): XmlNodefirst<T>(name: string,required: true,accessor: (node: XmlNode) => T | undefined,): Tfirst(name: string, required?: false): XmlNode | undefinedfirst<T>(name: string,required: false,accessor: (node: XmlNode) => T,): T | undefinedParametersname: stringrequired: trueReturnsXmlNodeType ParametersTParametersname: stringrequired: trueaccessor: (node: XmlNode) => T | undefinedReturnsTParametersname: stringoptionalrequired: falseReturnsXmlNode | undefinedType ParametersTParametersname: stringrequired: falseaccessor: (node: XmlNode) => TReturnsT | undefined