doc: comment in webpack configs

build/webpack.demo.js

@@ -1,3 +1,6 @@
+/**
+ * Webpack config to see if css file works on demo page
+ */
 const path = require('path')
 const webpack = require('webpack')
 const config = require('./config')

build/webpack.dev.js

@@ -1,3 +1,6 @@
+/**
+ * Webpack config under development
+ */
 const path = require('path')
 const webpack = require('webpack')
 const config = require('./config')

build/webpack.doc.js

@@ -1,3 +1,6 @@
+/**
+ * Webpack config to pack documentation page
+ */
 const path = require('path')
 const webpack = require('webpack')
 const config = require('./config')

build/webpack.release.js

@@ -1,3 +1,6 @@
+/**
+ * Webpack config to test if there is any problem in index.js before release
+ */
 const path = require('path')
 const webpack = require('webpack')
 const config = require('./config')

build/webpack.test.js

@@ -1,5 +1,7 @@
+/**
+ * Webpack config for unit test
+ */
 const path = require('path')
-// const ProgressBarPlugin = require('progress-bar-webpack-plugin')
 const VueLoaderPlugin = require('vue-loader/lib/plugin')
 const config = require('./config')