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browserify + npmでReactを使う場合はNODE_ENVを設定するとよい

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if ("production" !== process.env.NODE_ENV) {
  console.log('debug message');



$ NODE_ENV=production browserify src/app.js -o bundle.js

このようにしてビルドすると、Reactがenvifyというtransform packageを使っているため、次のように変換される。

if ("production" !== "production") {
  console.log('debug message');

さらにこれをuglifyにかけてminifyするとここに到達することはないdead codeということでコード自体を削ってくれる。

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