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Closure Compiler で定数置換

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Closure Compiler定数の置換が便利だったのでメモ。

/** @define {string} */
var HOGE = 'hoge';

こんなソースを

java -jar compiler.jar --define "HOGE='moge'" --js src.js

と実行すると

var HOGE="moge";

定数の値を上書きして出力してくれる。
API KEY とかを環境で切り分ける時に便利かもしれない。

ついでに Grunt で使う時は

config =  {
    js: src.js,
    options: {
        define: [
            "HOGE=\\'moge\\'"
        ]
    }
};

と指定する。

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