dart-lang/sdk

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

willladislaw

@willladislaw

tis flutter

Randal L. Schwartz

@RandalSchwartz

ahh, then my build() comment might apply

you should treat build() as if it is being called 60 times per second. It should be fast and idempotent. In practice, there are optimizations.

Rob Halff

@rhalff

@willladislaw is there any specific bloc implementation you are using? Normally the bloc will receive the repository to handle the data and then produces new states which you can handle within your UI code. That way the rendering never has to wait but is only tasked with representing the new state.

willladislaw

@willladislaw

@rhalff I'm using a simple bloc class for streams and sinks

Green Appers, Inc.

@GreenAppers

Hm. So now I want to get dart:io WebSocket running over dartssh SSH tunnel.

Seems like it would be possible to use WebSocket.fromUpgradedSocket().

But that would mean I implement dart Socket interface myself, and that I prepare the socket in correct state. Neither of which is a trivial task. It's not clear if I could use dart http to prepare the socket state (e.g. do HTTP get).

Green Appers, Inc.

@GreenAppers

So if anyone has any advice on either side, please let me know.

Ping

@ping996

does the dynamic type parameters in a function will slow the execution when it compiled to AOT mode?

bpilot

@bpilot

@ping996 Seems like a good thing to A/B test.

Ping

@ping996

thanks

bpilot

@bpilot

Sorry I don't have an answer. I'd be interested to hear what the result is though.

Renato Athaydes

@renatoathaydes

Can't Dart compile to code runnable with node.js?

bpilot

@bpilot

@renatoathaydes Hmm, I have it working

Renato Athaydes

@renatoathaydes

What do you do to run the js spilled out by the compilers?

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>

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