This Project will Host MS's Chakra Javascript Engine inside of PowerShell, providing Cmdlets to execute arbitary Javascript, Javascript Functions from within PowerShell Now Supporting TypeScript 1.0

##Goals

• Run Arbitary JS from within PowerShell.
• Ability to have JSSessions so you can have more than one JS runtime active at a time.
  • get-JSSession -> list in the session in the environment. (or get a specific one).
  • New-JSSession -> ability to create a JS runtime environment with various options.
  • Remove-JSSesson -> remove a JS runtime environment.
• Load JS files into a JSSession.
• Load JS files.
• Run JS functions from PS, passing in properties.
• return JS results to PowerShell.
• Get-JSfunction -session X : List functions in a JS session (possibly in the future a provider).
• Get-JSVariable -Session X : List (or get a specific) variable from JS session.
• Set-JSVariable -Session X : sets the value of a JS var.
• Variables , Results and Arguments.
  • transform compatible types automatically (i.e string, bool, int, double (depending on number in JS ), null etc.
  • ability to provide transformation functions.
  • other objects on the way in get transformed into JSON, and on the way out can come as JSON, or get
    transformed to PSCustomObjects.
• Invoke-JS - main way to run JS
  • a way to invoke it simply where a session is created and destroyed at the end.
  • ability to create a new session with this.
  • ability to run code without returning any values.
  • ability to take in PS arguments, and pass them (and if needed transform them).
  • ability to return results as correct PS types, or JSON or PScustomObject.
• Invoke-JSfunction -Name ... -Session -Arguments : Ability to call a JS function in a session.
• New-JSproxy - Ability to take a JS function (or functions) and generate a PS wrapper.

##MidTerm Goals

• Call Back to PowerShell.
• Access PS variables from within JS.
• Ability to submit PS events.
• various package distributions (Joels, Chocolatey , Nuget)
• CoffeeScript and TypeScript support (include those libraries automatically, and functions that will parse,compile,and execute them)

##Non-Goals

• any WebServer or trying to be Node.JS.

##Possible Future Scope

• Enter-JSSession - basically a Javascript REPL interface not too unlike Node.JS
• Start-JSJob - aysnc sessions that work like jobs. working behind the scenes, either it will plug into the PSJob framework with | Wait-job and Receive-Job or at least work in a consistant manner. (Wait-JSJob , Receive-JSJob).
• Object to do Ajax calls.

#Examples

 ipmo PowerChakra -Force
 
 #invoke a simple expression
 invoke-js "5+5"
 
 New-JSSession -Name test
 #invoke an expression, in a session, and DON'T RETURN RESULTS
 Invoke-JS -Name test -Script "var x = 5; function add(y){return y+y}" -NoResults
 #reuse the session, running a function previously applied AND return results.
 Invoke-JS -Name test -Script "add(x,10)"

 #create a nested PS object
 invoke-JS -Name test -Script "var ourobj = {name : 'PowerChakra', numbers : [1,2,3] , something: { x:1}  }" -NoResults
 #get object as JSON, then convert to PS object 
 $objectasJSON = invoke-JS -Name test -Script "JSON.stringify(ourobj)"
 $objectasJSON 
 $objectasPSobj = ConvertFrom-Json $objectasJSON
 $objectasPSobj | fl

A TypeScript Example

ipmo PowerShellJS -Force
$null = New-JSSession -Name test
Invoke-TypeScript -name test -script "1+1"
Invoke-TypeScript -name test -script "var adder = x => x * x" -NoResults
Invoke-JS -name test -Script "adder(5)"

#Installation Copy PSModule/PowerShellJS to your PowerShellModules folder, then load with Import-Module

###Random Notes SessionID and Name Call backs JS exceptions.

(C) 2013-2014 ShellTools LLC. Released under Microsoft Public License (Ms-PL)

The .Net Javascript Wrapper is derived from [MSieJavaScriptEngine] (http://github.com/Taritsyn/MsieJavaScriptEngine) Microsoft Public License (Ms-PL)

• MSieJavaScriptEngine - License: Microsoft Public License (Ms-PL) Part of the code of this library served as the .Net library powering PowerChakra.
• SassAndCoffee.JavaScript - License: Microsoft Public License (Ms-PL) Part of the code of this library served as the basis for MSIE JS Engine.
• ECMAScript 5 Polyfill - Adds support for many of the new functions in ECMAScript 5 to downlevel browsers using the samples provided by Douglas Crockford in his "ECMAScript 5: The New Parts" talk.
• JSON2 library - Adds support of the JSON object from ECMAScript 5 to downlevel browsers.
• Microsoft Ajax Minifier - License: Apache License 2.0 (Apache) JS-files, that used MSIE JS Engine, minificated by using ajaxmin.exe.
• TypeScript - License: Apache License 2.0 (Apache) TypeScript Language and Compiler