@jil/args/src/utils/expandShortOption.ts

A convention based argument parsing and formatting library, with strict validation checks

import {ArgsError} from '../errors';
import {AliasMap, LongOptionName, ShortOptionName} from '../types';

/**
 * Expand a short option name to a long option name.
 */
export function expandShortOption(short: ShortOptionName, map: AliasMap, loose: boolean): LongOptionName {
  if (!map[short]) {
    if (loose) {
      return short;
    }

    throw new ArgsError('SHORT_UNKNOWN', [short]);
  }

  return map[short];
}