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/** * This class helps perform string-related processes like string * transformations, reading, and replacing. */export class StringService {  /**   * Parse a URL query string in it's raw form.   *   * If the request body's content type is `application/json`, then:   * {"username":"root","password":"alpine"} becomes   * { username: "root", password: "alpine" }.   *   * If the request body's content type is `application/x-www-form-urlencoded`,   * then:   * `username=root&password=alpine` becomes   * `{ username: "root", password: "alpine" }`.   *   * @param queryParamsString - The query params string (e.g.,   * hello=world&ok=then&git=hub)   * @param keyFormat - (optional) The format the keys should be mutated to. For   * example, if "underscore" is specified, then the keys will be converted from   * key-name to key_name. Defaults to "normal", which does not mutate the keys.   * @param keyCase - (optional) The case the keys should be mutated to. For   * example, if "lowercase" is specified, then the keys will be converted from   * Key-Name to key-name. Defaults to "normal", which does not mutate the keys.   *   * @returns A key-value pair array.  `{ [key: string]: string }`. Returns an   * empty object if the first argument is empty.   */  static parseQueryParamsString(    queryParamsString: string,    keyFormat: string = "normal",    keyCase: string = "normal",  ): { [key: string]: string } {    let queryParams: { [key: string]: string } = {};
    if (!queryParamsString) {      return queryParams;    }
    if (queryParamsString.indexOf("#") != -1) {      queryParamsString = queryParamsString.split("#")[0];    }
    let queryParamsExploded = queryParamsString.split("&");
    queryParamsExploded.forEach((kvpString) => {      let kvpStringSplit = kvpString.split("=");      let key: string;      if (keyFormat == "normal") {        key = kvpStringSplit[0];        if (keyCase == "normal") {          queryParams[key] = kvpStringSplit[1];        }        if (keyCase == "lowercase") {          queryParams[key.toLowerCase()] = kvpStringSplit[1];        }      }      if (keyFormat == "underscore") {        key = kvpStringSplit[0].replace(/-/g, "_");        if (keyCase == "normal") {          queryParams[key] = kvpStringSplit[1];        }        if (keyCase == "lowercase") {          queryParams[key.toLowerCase()] = kvpStringSplit[1];        }      }    });
    return queryParams;  }}