opts restrictToOnly.js

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  const {argumentValueRestrictionsViolated} = require('../../errors')
 
module.exports = ({errs = [], opts: OPTS = []} = {}) => {
  const opts = []
 
  for (let i = 0; i < OPTS.length; i++) {
    const option = OPTS[i]
    const {values, only} = option
 
    if (typeof only === 'undefined' || only === null) {
      opts.push(option)
    } else {
      for (let i = 0; i < values.length; i++) {
        const value = values[i]
        if (only.indexOf(value) > -1) {
          opts.push(option)
        } else {
          errs.push(argumentValueRestrictionsViolated({value, only, option}))
        }
      }
    }
  }
 
  return {errs, opts}
}