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/** * Represents an XML tag.  */export interface Tag {  name: string;  children: Tag[] | string;  attributes: [string, string][];}
/**  * Represents an XML declaration. */ export interface Declaration {   attributes: [string, string][] }
/** * Returns a `Tag` * @param name name of the tag  * @param children subtags/string content  * @param attributes key/value attributes of the tag */export function tag(name: string, children: string | Tag[] = "", attributes: [string, string][] = []): Tag {  return {name, children, attributes}}

export function declaration(attributes: [string, string][]): Declaration {  return { attributes }}
/** * Serializes given tag and its children * to an XML string. * @param nodes */export function serialize(...nodes: (Tag[] | Declaration[])): string {
  return (nodes as Array<Tag | Declaration>)      .map((node: Tag | Declaration) => {
        const attributes = format_attributes(node);
        //NOTE: assuming that this is a Tag if name is present        if (node.hasOwnProperty("name")) {
          const tag = node as Tag;          const children = get_children(tag);          return format_tag(tag.name, attributes, children);        } else {
          return format_declaration(attributes);        }      })      .join("");}
const format_declaration = (attributes: string) => `<?xml ${attributes}?>`

const get_children = (tag: Tag) =>  (typeof (tag.children) === "string")    ? tag.children    : tag.children      .map((child) => serialize(child))      .join("");
const format_attributes = (node: Tag | Declaration) =>  node.attributes    .map(([key, value]) => `${key}="${value}"`)    .join(" ");
const format_tag = (name: string, attributes: string, content: string) =>  `<${name}${attributes.length > 0    ? ` ${attributes}`    : ``}>${content}</${name}>`;