dart-lang/sdk

The Dart SDK, including the VM, dart2js, core libraries, and more.

bpilot

@bpilot

I think I had to write some stub code.

Are you using dart2js?

Renato Athaydes

@renatoathaydes

Tried both dart2js and dartdevc

dartdevc generates something like:

define(['dart_sdk'], function(dart_sdk) {

bpilot

@bpilot

This is what I did to get dart2js code to run in Node.js:
I made a JS file which exports these globals:
global.self = global;
self.module = module;
global.window = global;
global.Blob = function () { };
global.Event = function () { };
global.ImageData = function () { };
global.Node = function () { };
global.Window = function () { };

Then I do below that:
require("./mydartjsfile.js");

Renato Athaydes

@renatoathaydes

This is all??

bpilot

@bpilot

I've also got dartdevc running in Node.js before, but it is a but more involved.

Renato Athaydes

@renatoathaydes

I just need any of them to work... it's just to test.

bpilot

@bpilot

I think so. That's from some code I made to run dart2js output in Node

Renato Athaydes

@renatoathaydes

Wow, it worked :D thanks

bpilot

@bpilot

To get dartdevc working in Node, I hard to write a bunch code to recursively load & execute each ddc.js file. Took my like half a day to get it right. :-D

Renato Athaydes

@renatoathaydes

You should publish a builder for this.

bpilot

@bpilot

But dart2js is pretty basic. You just need to declare some globals it's expecting to see in a browser than Node.js lacks. There might be a way to tell Dart2JS to output Node.js-friendly code though.

Renato Athaydes

@renatoathaydes

so people could do pub run build_runner build and it would spit out a nodejs runnable module.

bpilot

@bpilot

Hmm.

Renato Athaydes

@renatoathaydes

or something like webdev build

so you would do dart2node build :)

bpilot

@bpilot

I'm actually hoping they just add the option to dart2js. I don't know why I can't find it because the test runner already supports Node.js.

What is your motivation for using Dart with node.js?

Renato Athaydes

@renatoathaydes

testing GH Actions

they need to be runnable in node

I'm quite surprised Dart compilers don't transpile to node directly.

bpilot

@bpilot

Ah okay. The reason for me was I have a legacy Node.js application which I'm slowly migrating to Dart, so I need the code to be able to execute inside & interop with JS code.

I am too, especially since the test runner does.

Renato Athaydes

@renatoathaydes

exactly

pub run test -p node works

Renato Athaydes

@renatoathaydes

There's already a package for node interop: https://pub.dev/packages/node_interop

and the builder I was saying we should have: https://pub.dev/packages/build_node_compilers

bpilot

@bpilot

Brilliant find!

imerkle

@imerkle

If I want to send list of ints I can do like asTypedList

But I can't figure how to send list of struct in ffi

imerkle

@imerkle

final ptr = allocate<Uint8>(count: size);
    final externalTypedData = ptr.asTypedList(size);

I want to implement asTypedList for <T>

Flavian Alexandru

@alexflav23

If a version of webdev is added to dev_dependencies in pubspec.yaml does that forces it to be used and auto-downloaded on every machine? Just been through a catastrophic 2.6.0 update and it’s not making a lot of sense that webdev, build_runner and build_compiler are closely knit together without them being versioned tied as well.

I’m not sure if inside the migthy google this is always remotely built via forge/blaze and therefore this kind of coupled setup is largely irrelevant, it’s certainly looking to behave that way

But it’s certainly a bit of a pain point for all plebs that are confined to forever build locally at dev time :)

Nate Bosch

@natebosch

We agree that the version coupling between webdev and build_runner is a problem - we had hoped that by not expressing it as a pub dependency it would give us leeway for a better UX but that hasn't worked out in practice. We don't have any short term plans here but finding a better way to handle versioning is something that we are interested in improving.

I'm a bit confused about what you mean about it being auto-downloaded on every machine. It is true that if we put more stuff into dev_dependencies that everyone who works on the project and does a pub get would download those packages. It doesn't impact anyone who depends on those packages though, so they don't put a download burden on further downstream stuff.

I'm trying to understand your main concern - is it related to having to download all these packages on each host you work on? Or on a continuous integration environment?

Flavian Alexandru

@alexflav23

Yeah basically

Just had to go round a 10 dev team to do manual webdev bumps

Because post 2.6.0 update it all went kaboom and we were left scratching heads

I’m not sure if there’s a clever way to mitigate that in the short term, outside of Docker boxes or whatever, that would be a time penalty and resource penalty

It stands to reason that if there’s a git committed lock file, all deps should largely look identical. In contrast, something like SBT let’s you define Scala version and whatnot exclusively in project files. If I don’t have the correct “out deps” as a dev checking in a new commit, they get automagically setup

Nate Bosch

@natebosch

I can't think of a good way to mitigate in the short term. Hopefully we're able to find a better way to distribute webdev that makes the updates less painful in the future. It won't reduce the amount of downloading that needs to happen, but hopefully we can avoid those runtime version complains and make it so that a pub get will just get you into a state where things work

Flavian Alexandru

@alexflav23

Downloading is fine, so long as it’s automated.

bpilot

@bpilot

Use dart2js command directly?

Flavian Alexandru

@alexflav23

@natebosch Basically downloading on each machine is the automation dream, just to be clear. E.g new webdev version in the lock, autoresolve. In practice it means of course localsing the webdev launcher to the “project scope”, which could be teh defined folder structure that has a pubspec.yaml at the top level.

That being said, sounds like this is on the roadmap

And we need to wait for a fix

Rob Becker

@robrbecker

@natebosch This ties into what we were looking to do by adding global dependencies in the pubspec.yaml dart-lang/pub#1231 .. @alexflav23 If that’s something you’d like, give that issue a thumbs up.

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