feat: enum string parameter type

[ForbesLindesay]

No description provided.

[rollingversions]

Change Log for parameter-reducers (2.0.0 → 2.1.0)

New Features

• Add param.enumString utility to easily specify a parameter that can only have one of a list of defined values.

  Usage:

  import {startChain, param, parse} from 'parameter-reducers';
  
  const params = startChain().addParam(
    param.enumString(['-l', '--level'], 'level', [
      'info',
      'warn',
      'error',
    ] as const),
  );
  
  const {level = 'error'} = parse(params, process.argv.slice(2)).extract();
  
  if (level === 'info') {
    console.info('Some info');
  }
  if (level === 'info' || 'warn') {
    console.warn('Some warning');
  }
  console.warn('Some error');

• Add param.positionalEnumString utility to easily specify a positional parameter that can only have one of a list of defined values.

  Usage:

  import {startChain, param, parse} from 'parameter-reducers';
  
  const params = startChain().addParam(
    param.positionalEnumString('env', ['staging', 'production'] as const),
  );
  
  const {env = 'staging'} = parse(params, process.argv.slice(2)).extract();
  
  if (env === 'staging') {
    console.info('Deploying to staging');
  }
  if (env === 'production') {
    console.warn('Deploying to production');
  }

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