From fa8c932f14d3292fa595293875b283a1ce933a67 Mon Sep 17 00:00:00 2001
From: Jason Miller <developit@google.com>
Date: Tue, 3 Apr 2018 16:59:41 -0400
Subject: [PATCH] Allow specifying a function/regex URL filter for external
 stylesheets

---
 config/critters-webpack-plugin.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/config/critters-webpack-plugin.js b/config/critters-webpack-plugin.js
index 6e853b53..c46772f2 100644
--- a/config/critters-webpack-plugin.js
+++ b/config/critters-webpack-plugin.js
@@ -26,6 +26,10 @@ const PARSE5_OPTS = {
 module.exports = class CrittersWebpackPlugin {
   constructor(options) {
     this.options = options || {};
+    this.urlFilter = this.options.filter;
+    if (this.urlFilter instanceof RegExp) {
+      this.urlFilter = this.urlFilter.test.bind(this.urlFilter);
+    }
   }
 
   /** Invoked by Webpack during plugin initialization */