Escape HTML text. Distilled from `handlebars/utils.js`.

escapeHTML.js

const entity = {
  "&": "&",
  "<": "&lt;",
  ">": "&gt;",
  '"': "&quot;",
  "'": "&#x27;",
  "`": "&#x60;",
  "=": "&#x3D;"
};

function escapeHTML(text) {
  if (typeof text !== "string") {
    if (text == null) {
      return "";
    } else if (!text) {
      return text + "";
    }
    text = "" + text;
  }

  if (!/[&<>"'`=]/.test(text)) {
    return text;
  }

  return text.replace(/[&<>"'`=]/g, char => entity[char]);
}