Dart Dev Compiler, pub serve, Hello World...

[Danny Tuppeny]

I'm starting to think about how to add support for web apps to Dart Code. I have little experience with Dart web apps nor DDC (I'm aware DDC is still in dev) so I have a lot of questions!

I can't find much info on DDC but I figured maybe there are people on this list using it so maybe I can get some answers!

• What does a Hello World app look like if you're using DDC? (What's in pubspec? What does the script tag in the HTML file point at?)
• Will pub serve work nicely with DDC?
• Can DDC (or pub, or whatever) automatically recompile on changes?

(and there are more questions here)

[Danny Tuppeny]

Hmmm, found this (added 15 days ago):

https://github.com/dart-lang/dev_compiler/blob/15f19aab3674915942b02f120f111c9c5c32815c/web/main.dart#L11

/// Additionally, these commands are being considered

///   * link:  combines several JS modules into a single JS file

///   * build: compiles & links a set of code, automatically determining

///            appropriate groupings of libraries to combine into JS modules

///   * watch: watch a directory and recompile build units automatically

///   * serve: uses `watch` to recompile and exposes a simple static file server

///            for local development

[Matan Lurey]

I think the easiest way to start might be the traditional Dartium/dart2js route while the DDC story ramps up. Will that work?

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[Danny Tuppeny]

It would probably work, but it seems like wasted effort if DDC is useable. Dartium also adds complications; we have to make sure the user has it, make sure it's launched with --user-data-dir to avoid trashing their Chrome profile. Dart2js doesn't output very debuggable JS (does it even do incremental compiles?)

I guess it depends how far off DDC is being useable; if it's a long way, maybe it'd worth it, but I was under the impression it was working reasonably well?

[Matan Lurey]

IMO I'd support Dartium at minimum, even if it has some small complications, because of ease of use and most Dart developers use it today.

DDC is definitely usable, but I don't have a good understanding of the external story yet.

[Danny Tuppeny]

On Sun, 14 Aug 2016 at 18:47 Matan Lurey <ma...@lurey.org> wrote:

IMO I'd support Dartium at minimum, even if it has some small complications, because of ease of use and most Dart developers use it today.

Hmmm, I was actually hoping to avoid it because I don't think "ease of use" is one of its selling points!... User needs to:

• Download Dartium
• Extract it somewhere
• Decide where to put --user-data-dir (if they don't read about this, or I don't tell them, they can trash their Chrome profile)
• Edit my config to say where Dartium is, where their dartium profile is
• Open web project
• Press F5/the "Run" button

The experience I'm going for is:

• Open web project
• Press F5/the "Run" button

I really don't want to waste effort on Dartium or Dart2js if they're not the long-term plan. If DDC is usable and I'm building a new tool, it seems like it'd be good for us both if it was supported :-)

DDC is definitely usable, but I don't have a good understanding of the external story yet.

Is there anyone I can poke for a little info? Just a hello world web application and the command(s) to run/rebuild it would be a huge start! :) 

[Vijay Menon]

DDC is more a low-level compiler than a full-fledged build tool, so it's a little complicated to use right now.  There is no pub integration.  (We've been focusing on integrating with internal build tools.)

I did update the usage doc though:

https://github.com/dart-lang/dev_compiler/blob/master/USAGE.md

[Danny Tuppeny]

Great, I'll have a go and see where I can get. Thanks!