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+# Last Call Webpack Plugin
+
+A Webpack plugin that allows you to transform \ modify assets just before Webpack emits them.
+
+## What does the plugin do?
+
+It allows you to transform \ modify Webpack assets just before Webpack emits them (writes them to files or memory in case you are using something like Webpack dev server).
+
+It can be used for example to:
+* Prefix a ``` /* Author: John Doe */ ``` comment on all the .js files Webpack generates.
+* Run some final optimization on all .css files Webpack generates.
+
+## Installation:
+
+Using npm:
+```shell
+$ npm install --save-dev last-call-webpack-plugin
+```
+
+> :warning: For webpack v3 or below please use `last-call-webpack-plugin@v2.1.2`. The `last-call-webpack-plugin@v3.0.0` version and above supports webpack v4.
+
+## Configuration:
+
+The plugin can receive the following options:
+* assetProcessors: An Array of objects that describe asset processors:
+  * regExp: A regular expression to match the asset name that the processor handles.
+  * processor: A function with the signature of ``` function(assetName, webpackAssetObject, assets) ``` that returns a Promise. If the Promise returns a result this result will replace the assets content.
+  * phase: The webpack compilation phase that at which the processor should be called. Default value is `compilation.optimize-assets`. Can be one of the following values:
+    * `compilation.optimize-chunk-assets`
+    * `compilation.optimize-assets`
+    * `emit`
+* canPrint: A boolean indicating if the plugin can print messages to the console, defaults to `true`.
+
+Note: An environment supporting Promises or a Promise polyfill is needed for this plugin to be used.
+
+## Example:
+
+``` javascript
+var cssnano = require('cssnano');
+var LastCallWebpackPlugin = require('last-call-webpack-plugin');
+module.exports = {
+  module: {
+    loaders: [
+      { test: /\.css$/, loader: ExtractTextPlugin.extract("style-loader", "css-loader") }
+    ]
+  },
+  plugins: [
+    new ExtractTextPlugin("styles.css"),
+    new LastCallWebpackPlugin({
+      assetProcessors: [
+        {
+          regExp:  /\.js$/,
+          processor: (assetName, asset) => Promise.resolve('// Author: John Doe \n' + asset.source())
+        }, {
+          regExp:  /\.css$/,
+          processor: (assetName, asset) => cssnano.process(asset.source())
+            .then(r => r.css)
+        }
+      ],
+      canPrint: true
+    })
+	]
+}
+```
+
+## Assets manipulation
+
+The `processor` method is supplied an `assets` object that allows asset manipulation via the `setAsset(assetName, assetValue)` method. If `assetValue` is null the asset will be deleted. This object can be used to generate aditional assets (like source maps) or rename the an asset (create a new asset and delete the current one).
+
+Example:
+
+``` javascript
+var cssnano = require('cssnano');
+var LastCallWebpackPlugin = require('last-call-webpack-plugin');
+module.exports = {
+  module: {
+    loaders: [
+      { test: /\.css$/, loader: ExtractTextPlugin.extract("style-loader", "css-loader") }
+    ]
+  },
+  plugins: [
+    new ExtractTextPlugin("styles.css"),
+    new LastCallWebpackPlugin({
+      assetProcessors: [{
+        regExp:  /\.css$/,
+        processor: (assetName, asset, assets) => {
+          assets.setAsset(assetName + '.map', null); // Delete the <assetName>.map asset.
+          assets.setAsset(assetName + '.log', 'All OK'); // Add the <assetName>.log asset with the content 'All OK'.
+          return cssnano
+            .process(asset.source())
+            .then(r => r.css)
+        }
+      }],
+      canPrint: true
+    })
+	]
+}
+```
+
+The `assets` object also has a `getAsset(assetName)` method to get the content of an asset (returns undefined in case the asset does not exist).
+
+## License
+
+MIT (http://www.opensource.org/licenses/mit-license.php)
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