adding the paths options

Author: sscaff1

README.md

@@ -7,8 +7,8 @@ A webpack plugin to remove unwanted files which may have been created and output
 When using ExtractTextPlugin, it's not possible to generate a css file for each chunk webpack outputs, if you're using [code splitting](https://webpack.js.org/guides/code-splitting/).
 
 The only possible way to do this is to have an entry point for each top level css / less / scss file, however this will create small js files with empty webpack functions in them, which are undesirable.
- 
-This plugin removes files which are under a certain byte size, after everything has been compiled and output. It can also remove these files from your `manifest.json` file if you are using the [webpack manifest plugin](https://github.com/danethurber/webpack-manifest-plugin) or something similar to it. 
+
+This plugin removes files which are under a certain byte size, after everything has been compiled and output. It can also remove these files from your `manifest.json` file if you are using the [webpack manifest plugin](https://github.com/danethurber/webpack-manifest-plugin) or something similar to it.
 
 ## Usage
 
@@ -47,10 +47,12 @@ The ExtraneousFileCleanupPlugin accepts an object of options with the following
 new ExtraneousFileCleanupPlugin({
   extensions: ['.extensions', '.to', '.whitelist'],
   minBytes: 1024,
-  manifestJsonName: 'manifest.json'
+  manifestJsonName: 'manifest.json',
+  paths: ['/dist/removeFromThisPath']
 })
 ```
 
 * `extensions` - a list of extensions we're allowed to analyze for their file size. Useful for not removing small `.js.map` files, or small `.css` files. Defaults to analyzing all file types.
 * `minBytes` - the minimum byte size a file has to meet to not be deleted. Defaults to 1024 bytes.
 * `manifestJsonName` - if you're outputting a `manifest.json` file, this plugin will also remove deleted files from the manifest. Defaults to `manifest.json`
+* paths - an array of strings to specify which if any paths you want to limit the searching to. If this is defined, files will only be removed from those paths.

lib/plugin.js

@@ -5,6 +5,7 @@ function ExtraneousFileCleanupPlugin (options) {
   this.extensions = options.extensions || []
   this.minBytes = options.minBytes || 1024 // 1 KB minimum size
   this.manifestJsonName = options.manifestJsonName || 'manifest.json'
+  this.paths = options.paths || []
 }
 
 // check if the extension is in our allowed list
@@ -41,6 +42,12 @@ ExtraneousFileCleanupPlugin.prototype.removeFromWebpackStats = (compilation, ass
   }
 }
 
+ExtraneousFileCleanupPlugin.prototype.removeAsset = (compilation, outputPath, assetKey, extension = '') => {
+  // remove from various places
+  fs.unlinkSync(outputPath + '/' + assetKey + extension)          // unlink the asset
+  delete compilation.assets[assetKey]                 // remove from webpack output
+}
+
 ExtraneousFileCleanupPlugin.prototype.apply = function (compiler) {
   compiler.plugin('after-emit', (compilation, callback) => {
     const outputPath = compilation.options.output.path
@@ -62,21 +69,25 @@ ExtraneousFileCleanupPlugin.prototype.apply = function (compiler) {
       if (!this.validExtension(assetKey)) {
         return
       }
-
       // if it passes min byte check, ignore it
       assetStat = fs.statSync(outputPath + '/' + assetKey)
       if (assetStat.size > this.minBytes) {
         return
       }
 
-      // remove from various places
-      fs.unlinkSync(outputPath + '/' + assetKey)          // unlink the asset
-      delete compilation.assets[assetKey]                 // remove from webpack output
+      // if we pass paths assume that we only want to remove assets from those paths
+      if (
+        this.paths.length > 0 &&
+        !this.paths.some(path => (assetKey.startsWith(path) || ('/' + assetKey).startsWith(path)))
+      ) {
+        return
+      }
+
+      this.removeAsset(compilation, outputPath, assetKey)
 
       // remove map file from various places if it exists
       try {
-        fs.unlinkSync(outputPath + '/' + assetKey + '.map') // unlink the map file
-        delete compilation.assets[assetKey + '.map']        // remove from webpack output
+        this.removeAsset(compilation, outputPath, assetKey, '.map')
       } catch (e) {}
 
       if (usingManifestJson) {