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Scala.js v0.6試してみた

Posted at

Announcing Scala.js 0.6.0 http://www.scala-js.org/news/2015/02/05/announcing-scalajs-0.6.0/

事実上のstableらしいので久しぶりにやってみる。

tutorial

scalaのためにsbtを入れておく(brew install sbt等)

$ git clone git@github.com:scala-js/scalajs-tutorial.git
$ cd scalajs-tutorial
$ sbt run

scala本体とか色々インストールするんで最初は時間かかる

Node.jsで実行

build.sbtに次の一行を追加

scalaJSStage in Global := FastOptStage

sbt runするにはphantom.js入れておく必要はあった。デフォルトはrhinoでクッソ遅いとのこと。

サイズ比較

本当に最小限のhelloworldです。

package tutorial.webapp
import scala.scalajs.js.JSApp
object TutorialApp extends JSApp {
  def main(): Unit = {
    println("hello!");
  }
}

fastOptJS

開発時のビルドモード

約2sでビルド後が138k

~/s/scalajs-tutorial (0.6.x) $ sbt fastOptJS
[info] Loading project definition from /Users/mizchi/sandbox/scalajs-tutorial/project
[info] Set current project to Scala.js Tutorial (in build file:/Users/mizchi/sandbox/scalajs-tutorial/)
[info] Fast optimizing /Users/mizchi/sandbox/scalajs-tutorial/target/scala-2.11/scala-js-tutorial-fastopt.js
[success] Total time: 2 s, completed 2015/02/07 3:40:17

fullOptJS

productionビルド相当

約4sでビルド後が19k

~/s/scalajs-tutorial (0.6.x) $ sbt fullOptJS
[info] Loading project definition from /Users/mizchi/sandbox/scalajs-tutorial/project
[info] Set current project to Scala.js Tutorial (in build file:/Users/mizchi/sandbox/scalajs-tutorial/)
[info] Full Optimizing /Users/mizchi/sandbox/scalajs-tutorial/target/scala-2.11/scala-js-tutorial-opt.js
[info] Closure: 0 error(s), 0 warning(s)
[success] Total time: 4 s, completed 2015/02/07 3:42:08

サイズ

~/s/scalajs-tutorial (0.6.x) $ la target/scala-2.11/
total 1256
drwxr-xr-x  9 mizchi  staff   306B  2  7 03:42 .
drwxr-xr-x  6 mizchi  staff   204B  2  7 03:14 ..
drwxr-xr-x  4 mizchi  staff   136B  2  7 03:30 classes
-rw-r--r--  1 mizchi  staff   138K  2  7 03:40 scala-js-tutorial-fastopt.js
-rw-r--r--  1 mizchi  staff   157K  2  7 03:40 scala-js-tutorial-fastopt.js.map
-rw-r--r--  1 mizchi  staff   242K  2  7 03:40 scala-js-tutorial-jsdeps.js
-rw-r--r--  1 mizchi  staff   144B  2  7 03:40 scala-js-tutorial-launcher.js
-rw-r--r--  1 mizchi  staff    19K  2  7 03:42 scala-js-tutorial-opt.js
-rw-r--r--  1 mizchi  staff    59K  2  7 03:42 scala-js-tutorial-opt.js.map

感想

昔はビルドに3分、出力40MBとかあったのだが、すごく軽くなっててすごい(小学生並みの感想)

実行速度とライブラリの充実次第で、今選択するの全然アリな気がする。

次は周辺ツールを探す。

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