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Asset Pipelineで生成されるjsを分割する

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背景

  • 特定のユーザにだけ必要なライブラリをapplication.jsとは別に読み込みたい

やりかた

application.rb
    # Precompile additional assets.
    config.assets.precompile += %w(foobar.js)

foobar.jsを出力する場合

app/assets/javascripts/foobar.js
//= require foo
//= require bar
//= require baz

foo.jsとかbar.jsvendor/assets/javascriptsに入っている想定

app/assets/javascripts/application.js
//= require jquery
//= require jquery_ujs
//= require turbolinks

//= stub foobar

//= require_tree .

//= stub foobarfoobarが含まれるのを防ぐ。//= require_tree .を使わなければ不要

参考

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