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/** * Render markup tag. * @param tagName (required) * @param attributes (optional) * @param children (optional) * @return rendered tag * * Examples: * * ```ts * import { tag } from "./mod.ts" * import { assertEquals } from "https://deno.land/std/testing/asserts.ts" * * // common usage * assertEquals( *   tag("div", { id: "foo", class: "bar" }, "Hello world!"), *   `<div id="foo" class="bar">Hello world!</div>`, * ); * * // void (no-close) tag * assertEquals( *   tag("meta", { charset: "utf-8" }), *   `<meta charset="utf-8">`, * ); * * // nested tags * assertEquals( *   tag( "ul", { class: "nav" }, tag("li", "first"), tag("li", "second")), *   `<ul class="nav"><li>first</li><li>second</li></ul>`, * ); * ``` */export function tag(  tagName: string,  attributesOrFirstChild?: Record<string, string | number> | string,  ...children: Array<string>): string {  if (/\s/.test(tagName)) {    throw new Error("tagName has whitespace characters.");  }
  const isVoidTag = [    "area",    "base",    "br",    "col",    "embed",    "hr",    "img",    "input",    "link",    "meta",    "param",    "source",    "track",    "wbr",  ].includes(tagName);
  const attrs: Array<string> = [];  if (typeof attributesOrFirstChild === "string") {    children.unshift(attributesOrFirstChild);  } else if (attributesOrFirstChild != null) {    Object.entries(attributesOrFirstChild)      .forEach(([k, v]) => attrs.push(` ${k}="${v}"`));  }
  const close = isVoidTag ? "" : `${children.join("")}</${tagName}>`;
  return `<${tagName}${attrs.join("")}>${close}`;}
// character referencesexport const NBSP = "&nbsp;";export const LT = "&lt;";export const GT = "&gt;";export const AMP = "&amp;";export const QUOT = "&quot;";