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/** * TextDB class. * Put and get text data using TextDB. */export class TextDB {  /**   * DB api endpoint   */  public readonly endpoint: string;
  /**   * TextDB constructor   * @param  pageID   */  constructor(pageID: string) {    this.endpoint = `https://textdb.dev/api/data/${pageID}`;  }
  /**   * get data from TextDB   * it returns undefined when the connection failed   * @return got data   */  async get(): Promise<string | undefined> {    try {      const response = await fetch(this.endpoint);      const text = await response.text();
      if (response.ok) {        return text;      }
      console.warn(response.statusText);    } catch (error) {      console.warn(error);    }
    return undefined;  }
  /**   * put data into TextDB   * the saved data is replaced, not appended   * @return succeeded or not   */  async put(data: string): Promise<boolean> {    try {      const response = await fetch(        this.endpoint,        {          method: "POST",          headers: { "content-type": "text/plain" },          body: data,        },      );
      // ensure to close resource      await response.text();
      return response.ok;    } catch (error) {      console.warn(error);    }
    return false;  }
  /**   * clear saved data   * @return succeeded or not   */  async clear(): Promise<boolean> {    return await this.put("");  }}