async readLine() {
    const s = await this.readLineSlice();
    if (s === null) return null;
    return str(s);
  }
/** readLine() reads a single line from the TextProtoReader,
   * eliding the final \n or \r\n from the returned string.
   */
readLine() reads a single line from the TextProtoReader,
eliding the final \n or \r\n from the returned string.
readLine () reads a single line from the TextProtoReader eliding the final \ n or \ r \ n from the returned string .
async readLine() {
    const s = await this.readLineSlice();
    if (s === null) return null;
    return str(s);
  }
async readLine ( ) { const s = await this . readLineSlice ( ) ; if ( s === null ) return null ; return str ( s ) ; }
readLine() reads a single line from the TextProtoReader,
 eliding the final \n or \r\n from the returned string.
readLine () reads a single line from the TextProtoReader eliding the final \ n or \ r \ n from the returned string .