Webpackのビルド時間を1/3にした話 #gotandajs

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Webpackのビルド時間を　 1/3にした話　 2017/10/06 Gotanda.js #9 @mizuki_r

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@mizuki_r • シニアフロントエンドエンジニア • エンジニア 2 #javascript #gotandajs #meguroes #perl #kichijojipm 五反田のM社で位置ゲー開発に携わる。  スクラム教に入信したって噂。DDDをようやく真面目に学び始めた about me こんな人です

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本題の前にちょっとプロモーション

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Syntagme.js v1.0.0 リリースしました ٩(๑´3｀๑)۶　 https://github.com/rymizuki/syntagmejs/releases/tag/v1.0.0

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本題　

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Webpackのビルド時間を　 1/3にした話　

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　…基本的な話です　

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結論

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結論 • thread-loader • cache-loader

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はい

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ことの背景

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ある巨大リポジトリ

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巨大… • JavaScript • 781ϑΝΠϧɺ25934ߦɺ808610จࣈ • CoffeeScript • 336ϑΝΠϧɺ10266ߦɺ338988จࣈ • SCSS • 361ϑΝΠϧɺ43304ߦɺ1088861จࣈ • and moreʂ

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ビルド時間 Execution Time (2017-10-05 00:12:15 UTC) webpack 2m 10.7s Total 2m 11.9s

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もっと早くしたい…

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Buld Performance https://webpack.js.org/guides/build-performance/

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最新の安定版を使え Use the latest webpack version. We are always making performance improvements. The latest stable version of webpack is:

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必要最低限のモジュールをロードする Apply loaders to the minimal number of modules necessary.

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小さい少数のモジュールを使え Each additional loader/plugin has a bootup time. Try to use as few different tools as possible.

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resolveは最小限に • resolve.extensions • resolve.modules • resolve.mainFiles • resolve.descriptionFiles • etc….

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DLLPlugin使え Use the DllPlugin to move code that is changed less often into a separate compilation. This will improve the application's compilation speed, although it does increase complexitity of the build process.

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Smaller = Faster Decrease the total size of the compilation to ncrease build performance. Try to keep chunks small.

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thread-loader使え The thread-loader can be used to ofﬂoad expensive loaders to a worker pool.

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cache-loader使え Enable persistent caching with the cache-loader. Clear cache directory on "postinstall" in package.json.

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node-sassは遅いぞ node-sass has a bug which blocks threads from the Node.js threadpool. When using it with the thread- loader set workerParallelJobs: 2.

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そもそも

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3年の重み • grunt-contrib-coffeeͰconcat͢Δ࣌୅ͷίʔυ͕·ͩେྔʹ͋Δ • webpack΁ͷίʔυҠ؅ͷ్த • coffeeͱes2015ͷؒͷࢠ • ๲େͳscss…. • angular 1.x ….. • ྺ࢙͕ॏ͍

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それでもなんとかできないか？

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thread-loader

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thread-loader • WorkerPoolΛ༻ҙͯ͠ɺͦͷதͰloaderͰ࣮ߦ͢ Δ • ෳ਺εϨουͰ࣮ߦͰ͖Δ • σϑΥϧτͰ20JobΛฒྻͰಈ͔͢ • node-sass͕ϒϩοΫͯ͠·͏໰୊ͷղܾࡦ

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cache-loader

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cache-loader • ϑΝΠϧͷmtimeͰΩϟογϡ͠ͱ͘

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webpack.config.js

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result

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Execution Time (2017-10-05 00:37:56 UTC) webpack 1m 58.6s Total 1m 59.8s ✨ Done in 125.42s.

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まあ、まだキャッシュ乗ってないので….

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Execution Time (2017-10-05 00:40:48 UTC) webpack 33.8s Total 35.3s ✨ Done in 40.71s.

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だいたい1/3！！！

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あれ…？

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まとめ

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まとめ • thread-loaderͰWorkerPoolͰॲཧ͢Δ͜ͱͰ ଟগͳΓͱ଎౓͕վળ͢Δ • cache-loader࢖͏͜ͱͰඞཁͳ෦෼͚ͩͷϏ ϧυͰࡁΉͷͰ࣌ؒͷ୹ॖʹͳΔ

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node-sassは？ • thread-loader͍ΕͨΒͳΜ͔ॲཧ͕ࢭ·Δ… • fast-sass-loaderͳΔ΋ͷ͕͋Δ • ͕ɺfunctions͕࣮૷͞Εͯͳ͔ͬͨ • cacheͰߴ͍վળ͕Ͱ͖ͨͷͰҰ୴ڐ༰