Fix: PowerShell fails when the key is pushed before it is ready (#19)

lib/read.ps1

@@ -45,14 +45,20 @@ foreach ($arg in $argList) {
 # **NOTE** Don't include special characters of DOS in $command when $getRes is True.
 # [string] $cmdPath = $Env:ComSpec
 # [string] $psPath = 'powershell.exe'
-function execWithTTY ($command, $getRes = $False) {
+function execWithTTY ($command, $getRes = $False, $errorThrow = $False) {
   if ($getRes) {
     $res = (cmd.exe /C "<CON powershell.exe -Command $command")
-    if ($LastExitCode -ne 0) { exit $LastExitCode }
+    if ($LastExitCode -ne 0) {
+      if ($errorThrow) { throw $LastExitCode }
+      else { exit $LastExitCode }
+    }
     return $res
   } else {
     $command | cmd.exe /C ">CON powershell.exe -Command -"
-    if ($LastExitCode -ne 0) { exit $LastExitCode }
+    if ($LastExitCode -ne 0) {
+      if ($errorThrow) { throw $LastExitCode }
+      else { exit $LastExitCode }
+    }
   }
 }
 
@@ -67,10 +73,12 @@ if ($options.display) {
 if ($options.displayOnly) { return "''" }
 
 if (-not $options.keyIn -and $options.hideEchoBack -and $options.mask -eq '*') {
-  $inputTTY = execWithTTY ('$text = Read-Host -AsSecureString;' +
-    '$bstr = [Runtime.InteropServices.Marshal]::SecureStringToBSTR($text);' +
-    '[Runtime.InteropServices.Marshal]::PtrToStringAuto($bstr)') $True
-  return '''' + $inputTTY + ''''
+  try {
+    $inputTTY = execWithTTY ('$text = Read-Host -AsSecureString;' +
+      '$bstr = [Runtime.InteropServices.Marshal]::SecureStringToBSTR($text);' +
+      '[Runtime.InteropServices.Marshal]::PtrToStringAuto($bstr)') $True $True
+    return '''' + $inputTTY + ''''
+  } catch {} # ignore
 }
 
 if ($options.keyIn) { $reqSize = 1 }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "readline-sync",
-  "version": "1.2.20",
+  "version": "1.2.21",
   "title": "readlineSync",
   "description": "Synchronous Readline for interactively running to have a conversation with the user via a console(TTY).",
   "keywords": [