fetching_all.ts

async function fetchTables<E>(auth: any): Promise<Either<void, Promise<void>>> {
  const sheets = google.sheets({ version: 'v4', auth });
  const authorised: Task<string> = async () => readFromFile('src/private/table_meta.json', 'utf-8');
  const authErr = () => console.log('error reading private/table_meta.json');
  const fetchTables = async (data: string) => {
    const { tables, id } = JSON.parse(data);

    const ft: (t: string) => Task<Promise<Either<Error, unknown>>> = (t: string) => task.of(fetchTable(sheets, t, id));
    const tasks: Task<string>[] = tables.map(ft);

    const parallel = array.sequence(task.task)(tasks)();
    const _: any = await parallel;
    pipe(
      _,
      either.fold(
        (err) => console.log(err),
        () => console.log('done!')
      )
    );
  };
  return await pipe(tryCatch(authorised, authErr), map(fetchTables))();
}