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const tokenizeArgString = require('./lib/tokenize-arg-string')

  opts = Object.assign(Object.create(null), opts)

  // allow a string argument to be passed in rather

  // aliases might have transitive relationships, normalize this.

  const aliases = combineAliases(Object.assign(Object.create(null), opts.alias))

  const defaults = Object.assign(Object.create(null), opts.default)

  const configObjects = opts.configObjects || []

  const notFlagsOption = configuration['populate--']

  const notFlagsArgv = notFlagsOption ? '--' : '_'

  // allow a i18n handler to be passed in, default to a fake one (util.format).

  const negative = /^-([0-9]+(\.[0-9]+)?|\.[0-9]+)$/

  const negatedBoolean = new RegExp('^--' + configuration['negation-prefix'] + '(.+)')

  ;[].concat(opts.array).filter(Boolean).forEach(function (opt) {

    // assign to flags[bools|strings|numbers]

    const assignment = Object.keys(opt).map(function (key) {

  ;[].concat(opts.boolean).filter(Boolean).forEach(function (key) {

  ;[].concat(opts.string).filter(Boolean).forEach(function (key) {

  ;[].concat(opts.number).filter(Boolean).forEach(function (key) {

  ;[].concat(opts.count).filter(Boolean).forEach(function (key) {

  ;[].concat(opts.normalize).filter(Boolean).forEach(function (key) {

    keys.slice(0, -1).forEach(function (key, index) {

      // TODO(bcoe): in the next major version of yargs, switch to

      // Object.create(null) for dot notation:

      if (typeof o === 'object' && o[key] === undefined) {

      if (typeof o[key] !== 'object' || Array.isArray(o[key])) {

        // ensure that o[key] is an array, and that the last item is an empty object.

        // we want to update the empty object at the end of the o[key] array, so set o to that object

    // TODO(bcoe): in the next major version of yargs, switch to

    // Object.create(null) for dot notation:

    const key = sanitizeKey(keys[keys.length - 1])

    const isTypeArray = checkAllAliases(keys.join('.'), flags.arrays)

    const isValueArray = Array.isArray(value)

    let duplicate = configuration['duplicate-arguments-array']

    // nargs has higher priority than duplicate

    if (!duplicate && checkAllAliases(key, flags.nargs)) {

      if ((!isUndefined(o[key]) && flags.nargs[key] === 1) || (Array.isArray(o[key]) && o[key].length === flags.nargs[key])) {

      if (duplicate && isTypeArray && isValueArray) {

        o[key] = configuration['flatten-duplicate-arrays'] ? o[key].concat(value) : (Array.isArray(o[key][0]) ? o[key] : [o[key]]).concat([value])

      } else if (!duplicate && Boolean(isTypeArray) === Boolean(isValueArray)) {

    } else if (o[key] === undefined && isTypeArray) {

      o[key] = isValueArray ? value : [value]

        checkAllAliases(key, flags.counts) ||

        checkAllAliases(key, flags.bools)

  // extend the aliases list with inferred aliases.

      Object.keys(obj || {}).forEach(function (key) {

        // short-circuit if we've already added a key

        // to the aliases array, for example it might

        // exist in both 'opts.default' and 'opts.key'.

        flags.aliases[key] = [].concat(aliases[key] || [])

        // For "--option-name", also set argv.optionName

        flags.aliases[key].concat(key).forEach(function (x) {

          if (/-/.test(x) && configuration['camel-case-expansion']) {

            if (c !== key && flags.aliases[key].indexOf(c) === -1) {

        // For "--optionName", also set argv['option-name']

          if (x.length > 1 && /[A-Z]/.test(x) && configuration['camel-case-expansion']) {

        flags.aliases[key].forEach(function (x) {

          flags.aliases[x] = [key].concat(flags.aliases[key].filter(function (y) {

  // return the 1st set flag for any of a key's aliases (or false if no flag set)

    const toCheck = [].concat(flags.aliases[key] || [], key)

    const setAlias = toCheck.find(key => keys.includes(key))

    return setAlias ? flag[setAlias] : false

    const toCheck = [].concat(Object.keys(flags).map(k => flags[k]))

    return toCheck.some(function (flag) {

      return Array.isArray(flag) ? flag.includes(key) : flag[key]

  function hasFlagsMatching (arg, ...patterns) {

    const toCheck = [].concat(...patterns)

    return toCheck.some(function (pattern) {

      return match && hasAnyFlag(match[1])

  // based on a simplified version of the short flag group parsing logic

    // if this is a negative number, or doesn't start with a single hyphen, it's not a short flag group

    if (arg.match(negative) || !arg.match(/^-[^-]+/)) { return false }

// TODO(bcoe): in the next major version of yargs, switch to

  if (key === '__proto__') return '___proto___'

  "description": "the mighty option parser used by yargs",

    "test": "c8 --reporter=text --reporter=html  mocha test/*.js",

    "coverage": "c8 report --check-coverage check-coverage --lines=100 --branches=97 --statements=100"

    "url": "https://github.com/yargs/yargs-parser.git"

		{
		"name": "yargs-parser",
		"version": "18.1.0",
		"version": "18.1.1-beta.0",
		"description": "the mighty option parser used by yargs",
		@@ -5,0 +5,0 @@ "main": "index.js",

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		@@ -700,2 +700,6 @@ const camelCase = require('camelcase')
		keys.slice(0, -1).forEach(function (key, index) {
		// TODO(bcoe): in the next major version of yargs, switch to
		// Object.create(null) for dot notation:
		key = sanitizeKey(key)

		if (typeof o === 'object' && o[key] === undefined) {
		@@ -720,3 +724,6 @@ o[key] = {}

		const key = keys[keys.length - 1]
		// TODO(bcoe): in the next major version of yargs, switch to
		// Object.create(null) for dot notation:
		const key = sanitizeKey(keys[keys.length - 1])

		const isTypeArray = checkAllAliases(keys.join('.'), flags.arrays)
		@@ -1006,2 +1013,9 @@ const isValueArray = Array.isArray(value)

		// TODO(bcoe): in the next major version of yargs, switch to
		// Object.create(null) for dot notation:
		function sanitizeKey (key) {
		if (key === '__proto__') return '___proto___'
		return key
		}

		module.exports = Parser