website/playground/markdown.js/getMarkdownSyntax
function getMarkdownSyntax(options) {
  switch (options.parser) {
    case "babel":
    case "babel-flow":
    case "flow":
    case "acorn":
    case "espree":
    case "meriyah":
      return "jsx";
    case "babel-ts":
    case "typescript":
      return "tsx";
    case "json":
    case "json-stringify":
      return "jsonc";
    case "glimmer":
      return "hbs";
    case "angular":
    case "lwc":
      return "html";
    default:
      return options.parser;
  }
}