cooking: add env option

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## 未发布
 - cooking:
   - watch 时增加 NamedModulesPlugin
+  - 新增 `env` 选项，设置 definePlugin。不填时会自动设置 process.env.NODE_ENV，如果传入字符串会覆盖原来的 NODE_ENV，传入对象会和原来的配置合并
 
 ## [v1.1.1] 2016.09.20
 - cooking:

packages/cooking/util/is.js

@@ -11,3 +11,4 @@ exports.Array = obj => type(obj) === '[object Array]'
 exports.Object = obj => type(obj) === '[object Object]'
 exports.Boolean = obj => type(obj) === '[object Boolean]'
 exports.Function = obj => type(obj) === '[object Function]'
+exports.nil = obj => obj === null || obj === undefined

packages/cooking/util/merge.js

@@ -84,6 +84,21 @@ module.exports = function (userConfig, baseConfig) {
     config.output.umdNamedDefine = true
   }
 
+  // node_env
+  if (is.Object(userConfig.env)) {
+    config.plugins.Define = new webpack.DefinePlugin(Object.assign({
+      'process.env.NODE_ENV': JSON.stringify(process.env.NODE_ENV)
+    }, userConfig.env))
+  } else {
+    config.plugins.Define = new webpack.DefinePlugin({
+      'process.env.NODE_ENV': JSON.stringify(
+        is.nil(userConfig.env) ?
+        process.env.NODE_ENV :
+        userConfig.env
+      )
+    })
+  }
+
   // development
   if (process.env.NODE_ENV === 'development') {
     config.devtool = '#eval-source-map'
@@ -120,13 +135,6 @@ module.exports = function (userConfig, baseConfig) {
       config.output.chunkFilename = '[id].[chunkhash:7].js'
     }
 
-    // plugin
-    config.plugins.Define = new webpack.DefinePlugin({
-      'process.env': {
-        NODE_ENV: '"production"'
-      }
-    })
-
     const minimize = userConfig.minimize
     const UglifyJs = new webpack.optimize.UglifyJsPlugin({
       compress: {warnings: false},