May 2019
Intermediate to advanced
464 pages
9h 22m
Japanese
Content preview from Node.jsデザインパターン 第2版
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8.3
クロスプラットフォーム開発の基礎
263
console.log('Hey browser!');
オプションの
beautify: true
は、興味がある場合には作成されたバンドルファイルを読めるよう
に、インデントと空白をすべて除去してしまわないようにするものです。製品版を作成するときはこの
オプションを指定しないほうがよいでしょう。デフォルトでは
false
になります。
サンプルコードの中には、
Webpack
の
DefinePlugin
を使って、特定の定数を、バン
ドル生成のタイムスタンプ、現在のユーザー、現在の
OS
といった動的な変数で置換する
方法を示した例が追加してあります。
このテクニックを使うとずっと小さいバンドルファイルが作成できるので、実行時コード分岐よりは
るかに優れた方法ではありますが、間違った使い方をすればソースコードが長くて複雑なものになるこ
とは同じです。アプリケーション内のあちこちにサーバ用コードとブラウザ用コードに分岐する文があ
るのは望ましいことではありません。
8.3.3
モジュールの置換
多くの場合、クライアント用バンドルに含まれるべきコードと含まれるべきでないコードがビルド
時には既にわかっています。つまり、この判断を前もって行い、バンドル作成プログラムに対してモ
ジュールの実装を置き換えるようビルド時に命令すればよいわけです。そうすれば、不
要なモジュール
が削除されるのでバンドルファイルは小さくなり、実行時やビルド時の分岐に必要だった
if...else
文がすべ ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.