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node_modules/yargs/lib/argsert.js

@@ -1,20 +1,21 @@
+'use strict'
 const command = require('./command')()
 const YError = require('./yerror')
 
 const positionName = ['first', 'second', 'third', 'fourth', 'fifth', 'sixth']
 
-module.exports = function (expected, callerArguments, length) {
+module.exports = function argsert (expected, callerArguments, length) {
   // TODO: should this eventually raise an exception.
   try {
     // preface the argument description with "cmd", so
     // that we can run it through yargs' command parser.
-    var position = 0
-    var parsed = {demanded: [], optional: []}
+    let position = 0
+    let parsed = {demanded: [], optional: []}
     if (typeof expected === 'object') {
       length = callerArguments
       callerArguments = expected
     } else {
-      parsed = command.parseCommand('cmd ' + expected)
+      parsed = command.parseCommand(`cmd ${expected}`)
     }
     const args = [].slice.call(callerArguments)
 
@@ -22,33 +23,27 @@ module.exports = function (expected, callerArguments, length) {
     length = length || args.length
 
     if (length < parsed.demanded.length) {
-      throw new YError('Not enough arguments provided. Expected ' + parsed.demanded.length +
-        ' but received ' + args.length + '.')
+      throw new YError(`Not enough arguments provided. Expected ${parsed.demanded.length} but received ${args.length}.`)
     }
 
     const totalCommands = parsed.demanded.length + parsed.optional.length
     if (length > totalCommands) {
-      throw new YError('Too many arguments provided. Expected max ' + totalCommands +
-        ' but received ' + length + '.')
+      throw new YError(`Too many arguments provided. Expected max ${totalCommands} but received ${length}.`)
     }
 
-    parsed.demanded.forEach(function (demanded) {
+    parsed.demanded.forEach((demanded) => {
       const arg = args.shift()
       const observedType = guessType(arg)
-      const matchingTypes = demanded.cmd.filter(function (type) {
-        return type === observedType || type === '*'
-      })
+      const matchingTypes = demanded.cmd.filter(type => type === observedType || type === '*')
       if (matchingTypes.length === 0) argumentTypeError(observedType, demanded.cmd, position, false)
       position += 1
     })
 
-    parsed.optional.forEach(function (optional) {
+    parsed.optional.forEach((optional) => {
       if (args.length === 0) return
       const arg = args.shift()
       const observedType = guessType(arg)
-      const matchingTypes = optional.cmd.filter(function (type) {
-        return type === observedType || type === '*'
-      })
+      const matchingTypes = optional.cmd.filter(type => type === observedType || type === '*')
       if (matchingTypes.length === 0) argumentTypeError(observedType, optional.cmd, position, true)
       position += 1
     })
@@ -67,6 +62,5 @@ function guessType (arg) {
 }
 
 function argumentTypeError (observedType, allowedTypes, position, optional) {
-  throw new YError('Invalid ' + (positionName[position] || 'manyith') + ' argument.' +
-    ' Expected ' + allowedTypes.join(' or ') + ' but received ' + observedType + '.')
+  throw new YError(`Invalid ${positionName[position] || 'manyith'} argument. Expected ${allowedTypes.join(' or ')} but received ${observedType}.`)
 }