const ESCAPE_REPLACEMENTS = {
  "&": "&",
  "<": "&lt;",
  ">": "&gt;",
  '"': "&quot;",
  "'": "&#x27;",
  "`": "&#x60;",
};
const BAD_CHARS = /[&<>"'`]/g;
const POSSIBLE_CHARS = /[&<>"'`]/;

function escapeChar(chr) {
  return ESCAPE_REPLACEMENTS[chr];
}

export default function escape(string) {
  if (string === null) {
    return "";
  } else if (!string) {
    return string + "";
  }

  // Force a string conversion as this will be done by the append regardless and
  // the regex test will do this transparently behind the scenes, causing issues if
  // an object's to string has escaped characters in it.
  string = "" + string;

  if (!POSSIBLE_CHARS.test(string)) {
    return string;
  }
  return string.replace(BAD_CHARS, escapeChar);
}