Add the ability to run Dart web apps

(Updated July 2017)

Given DDC now works in pub serve the plan is to just use that and the Chrome Debugger protocol for debugging. This means no Dartium support.

I’ve opened #386 to collect some requirements/ideas for how this will work and plan to work on it over the coming weeks.

[DanTup]

FWIW for anyone doing web apps, while Dart Code doesn’t have supports, I still managed to get some basic behaviour for hitting F5 with the following config in Code (this is without any Dart Code changes - you can do this today; though it shouldn’t be required when Dart Code has real web support). F5 kicks off the Chrome debugger, but first it invokes pub run build_runner serve and it has some regexes so Code knows when it’s idle (versus building), so it will wait until the build is finished before opening the browser.

tasks.json:

{
	"version": "2.0.0",
	"tasks": [
		{
			"label": "pub serve",
			"type": "shell",
			"args": [
				"run",
				"build_runner",
				"serve"
			],
			"command": "pub",
			"group": "build",
			"isBackground": true,
			"problemMatcher": {
				"owner": "custom",
				"pattern": {
					"regexp": "__________"
				},
				"background": {
					"activeOnStart": true,
					"beginsPattern": "^\\[INFO\\] Starting Build",
					"endsPattern": "^\\[INFO\\] Succeeded after"
				}
			}
		}
	]
}

launch.json:

{
	"version": "0.2.0",
	"configurations": [
		{
			"type": "chrome",
			"request": "launch",
			"name": "Launch web app",
			"url": "http://localhost:8080",
			"webRoot": "${workspaceFolder}/web",
			"preLaunchTask": "pub serve"
		}
	]
}

Source maps for the files in web seem to work out of the box, but I haven’t had chance to dig into other files (like the SDK) yet.

[marcojakob]

Something similar to what Webstorm has would be great. An opinionated list of priorities:

1. Open HTML in Dartium
2. Open HTML in Dartium, debug in Visual Studio Code
3. pub build menu in editor
4. Open HTML in any other browser (Firefox, Chrome, IE, Safari), automatically compile
5. Automatically install and update Dart SDK and Dartium from Dart Code extension (don’t know if this is possible in any way)