How to use the json-schema-ref-parser.prototype function in json-schema-ref-parser

SwaggerParser.prototype.parse = async function (path, api, options, callback) {
  let args = normalizeArgs(arguments);
  args.options = new Options(args.options);

  try {
    let schema = await $RefParser.prototype.parse.call(this, args.path, args.schema, args.options);

    if (schema.swagger) {
      // Verify that the parsed object is a Swagger API
      if (schema.swagger === undefined || schema.info === undefined || schema.paths === undefined) {
        throw ono.syntax(`${args.path || args.schema} is not a valid Swagger API definition`);
      }
      else if (typeof schema.swagger === "number") {
        // This is a very common mistake, so give a helpful error message
        throw ono.syntax('Swagger version number must be a string (e.g. "2.0") not a number.');
      }
      else if (typeof schema.info.version === "number") {
        // This is a very common mistake, so give a helpful error message
        throw ono.syntax('API version number must be a string (e.g. "1.0.0") not a number.');
      }
      else if (schema.swagger !== "2.0") {
        throw ono.syntax(`Unrecognized Swagger version: ${schema.swagger}. Expected 2.0`);