Microsoft/ChakraCore

ChakraCore is the core part of the Chakra Javascript engine that powers Microsoft Edge

Jimmy Thomson

@MSLaguana

It's not supported at the moment, although someone did try it out and get it mostly working from what I recall. They did have to make some changes (a number of things happen on dll load, which will need to be changed for static linkage)

Jimmy Thomson

@MSLaguana

I don't recall the name of that person/project though, unfortunately

AdobeFlashMan

@AdobeFlashMan_twitter

Thank you for your replies. Yes, I tried to figure out how to convert ChakraCore.vcxproj to a static linking vcxproj, but it seems like I need to do a lot of things to do this ( e.g. ChakraBinaryAutoSystemInfoInit ).

Richard

@rhuanjl

I think the working (though with some issues) static version of chakracore was part of this game engine project: https://github.com/Kode/Krom

nanjizal

@nanjizal

AdobeFlashMan, you may find https://github.com/Kode/openfl interesting, it's basically a minimal incomplete implemention of OpenFL implemented on top of Kha and potentially suitable for use with Krom. As you may know OpenFL is a Haxe implementation of the flash api and compiles both to c++ and js. Kha is more of a renderloop approach like say starling's renderTexture but cleaner. Kha code base is mixed js/c build but uses haxe ( or C++ ) for coding. Haxe is quite similar to as3 but arguably a better. Kha can target js or c++, it uses Krom as one possible target, I think it might be built into 'Kode Studio' a variant of Visual Code Studio and used for testing and debugging Kha and shaders. Anyway the way Kha uses Krom is with shaders recompiled ( https://github.com/Kode/krafix ) so there is no Dom support and it's purely a JS shader engine. I don't know anything about static linking etc... being more front end x-flash and now a haxe dev. But if your looking for a way to create applications and games with ChakraCore then Kha is definitely an option, if your used to Flash then you will find the text support good but very low level. For GPU graphics it's much cleaner simpler than flash stage3d and starling and allows many workflows perhaps look and Armory3d and the core library Iron as one possible approach.

sorry my grammer is not ideal.

Grahame Grieve

@grahamegrieve

is there anyway I can mark an object as immutable? so that you can't assign to properties on it?

this applies to both to objects I pass into the javascript engine, and some objects created by the javascript code

Grahame Grieve

@grahamegrieve

a related question: I expose an object of mine to javascript, so that myObj.prop refers through to "prop" on my internal object, and myObj.prop = "test" sets the value of the prop on my object. But if the user accidentally does myObj.propx = "test", chakra creates a new js prop "propx" on the js wrapper object. I haven't found a way to either prevent this or get notified about it, so the property gets lost and it's effectively a silent bug. What are my options here?

Ondrej Kelle

@tondrej

@grahamegrieve to mark an object as immutable, I think you could use Object.freeze(), for hooking property setters/getters perhaps you could use a Proxy or, if you only want to prevent adding new properties, Object.preventExtensions()

Grahame Grieve

@grahamegrieve

well, I didn't think of freeze() because of this: "Accessor properties (getters and setters) work the same (and still give the illusion that you are changing the value)" - unless I misunderstand what that means?

Bruce Pascoe

@fatcerberus

Well I mean if there’s a setter then you can’t magically make the setter not be called on assignment

Grahame Grieve

@grahamegrieve

hmm I'm having trouble calling freeze() on an object. The sequence seems like:

use JsCreatePropertyId to get the propertyId for 'freeze'
use JsGetProperty to get the function for the propertyId
use JsCallFunction passing the func with one parameter which is the object to freeze

.. and I get an ErrorInvalidArgument so I'm doing something wrong?

Jimmy Thomson

@MSLaguana

If you want to invoke the javascript equivalent of Object.freeze(foo), then you need to get a JsValueRef objectObject referencing the global Object, and make sure that you pass that as the this parameter of the freeze function, since the C api is somewhat like calling freeze.call(Object, yourObject)

Grahame Grieve

@grahamegrieve

hmm thanks. that seems obvious... but when I call JsGetProperty for the propertyId for 'freeze' in the return value from JsGetGlobalObject I get a JsUndefined?

Jimmy Thomson

@MSLaguana

JsGetGlobalObject is getting the global object, not the global Object object. E.g. JsGetGlobalObject is the window / "this" object at global scope, and that has an "Object" property which is the Object of Object.freeze that you need to get the property off

Ondrej Kelle

@tondrej

@grahamegrieve In a chakracore-delphi example (using ChakraCoreUtils unit), it would look like this: JsCallFunction('freeze', [], JsGetProperty(JsGlobal, 'Object'));

Ondrej Kelle

@tondrej

An example of a similar usage is here, calling Object.create(prototype)

Grahame Grieve

@grahamegrieve

k thanks all. Really appreciate the help

Bruce Pascoe

@fatcerberus

Is it necessary to pass Object as this? Most JS builtins don’t require this because their spec doesn’t need them to access this at all

For example you can safely call JSON.stringify without JSON being passed as ‘this’

Richard

@rhuanjl

You have to get Object in order to then get at its property freeze but you can then call freeze with an undefined this value

Bruce Pascoe

@fatcerberus

Yeah that’s what I thought thanks @rhuanjl

Also look into JsObjectGetProperty to avoid the need for the PropertyId rigamorole

Michael Holman

@MikeHolman

Does anyone use the JsSetObjectBeforeCollectCallback API?

Jimmy Thomson

@MSLaguana

@fatcerberus Sorry yes you're right; the important thing is that the yourObject can't be the first parameter, since that is the "this" parameter

Ondrej Kelle

@tondrej

@fatcerberus Thanks for the JsObjectGetProperty tip!

Grahame Grieve

@grahamegrieve

is there a way to get the engine to run in strict mode?

Bruce Pascoe

@fatcerberus

You could prepend "use strict"; to all the scripts you run

As long as you don’t add a newline the line numbers should be preserved

Grahame Grieve

@grahamegrieve

so this function: function func(obj) { Object.freeze(obj); obj.prop = "23"; console.log(obj.prop); } logs undefined.

shouldn't this: use strict; function func(obj) { Object.freeze(obj); obj.prop = "23"; console.log(obj.prop); } throw an exception?

Bruce Pascoe

@fatcerberus

Put use strict in quotes. It’s a string followed by a semicolon

Note that strict mode doesn’t catch nonexisting property reads. Those still come back as undefined

It only catches nonexisting variables

Attempting to write to the frozen object will through an error in strict mode though

Grahame Grieve

@grahamegrieve

ok thanks.

Ondrej Kelle

@tondrej

Apparently upcoming 1.12 brings JsParseScriptAttributeStrictMode which can be passed to JsParse/JsRun (instead of augmenting your scripts with "use strict";) - nice :-) thanks!

Viktor Elofsson

@vktr

Hi! Is there any way I can return a native object from an importstatement? I'm embedding ChakraCore in a desktop application for scripting support and would like users to import { App } from 'some-native-module'; where some-native-module is an object I create in native code. Any pointers?

Richard

@rhuanjl

@vktr only way I can think of (without hacking/adding a feature to CC) would be to create a shim module in JS over the top of your native methods, you'd then intercept the 'some-native-module' specifier and load your shim module - question would be how to make your native methods available whilst executing that shim without leaving them on the global object

Bruce Pascoe

@fatcerberus

Trying to compile the latest master of ChakraCore with MSVC 2017 but getting this error on one of my machines (it built fine on my laptop):

29>d:\src\chakracore\lib\common\core\globalsecuritypolicy.h(17): error C2061: syntax error: identifier 'PCFG_CALL_TARGET_INFO'

Anyone have an idea what's wrong?

Louis Lafreniere

@LouisLaf

PCFG_CALL_TARGET_INFO is defined in winnt.h, but you need to have a recent enough SDK. I'm using 10.0.16299.0.

Bruce Pascoe

@fatcerberus

Pretty sure I have 10.0.17763(?). Whatever the latest is

Louis Lafreniere

@LouisLaf

That version of winnt.h does also contain the define. It turns out that's what I'm actually using... You can verify within VS by looking at the VC++ directories in the build properties, and seeing what they evaluate to.

Sasha Syrotenko

@Fly-Style

@rhuanjl
I don't think they've said anything about open sourcing EdgeHtml
@Fly-Style I think I'm the only regular external contributor to chakracore it would be cool to have another one around

@rhuanjl I am sorry for a big delay.
Agree with you :)

Rami

@icnocop

Hi! :)

Rami

@icnocop

Microsoft update KB4507460 released on July 9, 2019 causes an exception in jscript9.dll in Windows Server 2016 when using MFC's CDHtmlDialog. It basically causes the desktop application to crash. I'm wondering if I should report the issue in https://github.com/microsoft/ChakraCore or https://social.msdn.microsoft.com/Forums/Windowsdesktop/en-us/home? Thanks!

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