parser validate.js

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  const {argumentValueRestrictionsViolated} = require('../errors')
 
module.exports = ({only = null}) => ({errs = [], argv = []} = {}) => {
  const errs2 = []
  let argv2   = []
 
  if (typeof only === 'undefined' || only === null) {
    argv2 = argv
  } else {
    for (let i = 0; i < argv.length; i++) {
      const arg = argv[i]
      if (only.indexOf(arg) > -1) {
        argv2.push(arg)
      } else {
        errs2.push(argumentValueRestrictionsViolated({arg, only}))
      }
    }
  }
 
  return {errs: errs.concat(errs2), argv: argv2}
}