Sort in Node.JS using OS commands

sortCsvFile.ts

import * as childProcess from 'child_process';
import { promisify } from 'util';

type OptionalParams = {
  fieldSeparator?: string;
  hasHeader?: boolean;
};

type MandatoryParams = {
  byColumn: number;
  fromFilePath: string;
  toFilePath: string;
};

type ParamsWithDefaults = Required<OptionalParams> & MandatoryParams;

type Params = OptionalParams & MandatoryParams;

const exec = promisify(childProcess.exec);

const getSortCommand = ({
  byColumn,
  fieldSeparator,
  fromFilePath,
  hasHeader,
  toFilePath,
}: ParamsWithDefaults) =>
  [
    'sort',
    `--field-separator "${fieldSeparator}"`,
    `--key ${byColumn},${byColumn}`,
    ...(hasHeader ? [] : [fromFilePath]),
    `>> ${toFilePath}`,
  ].join(' ');

const getTailCommand = ({ fromFilePath }: ParamsWithDefaults) =>
  `tail -n +2 ${fromFilePath}`;

const getHeadCommand = ({ fromFilePath, toFilePath }: ParamsWithDefaults) =>
  `head -n 1 ${fromFilePath} > ${toFilePath}`;

const getCommandWithHeader = (params: ParamsWithDefaults) =>
  getHeadCommand(params) +
  ' && ' +
  getTailCommand(params) +
  ' | ' +
  getSortCommand(params);

const fieldSeparatorDefault = ';';

const sortCsvFile = ({
  hasHeader = true,
  fieldSeparator = fieldSeparatorDefault,
  ...rest
}: Params) =>
  exec(
    hasHeader
      ? getCommandWithHeader({ hasHeader, fieldSeparator, ...rest })
      : getSortCommand({ hasHeader, fieldSeparator, ...rest }),
  );

export default sortCsvFile;