Add path.sep to work on Windows

Author: marcelobart

index.js

@@ -1,3 +1,5 @@
+const path = require('path')
+
 const cloneDeep = require('lodash.clonedeep')
 
 const ruleChildren = (loader) => loader.use || loader.oneOf || Array.isArray(loader.loader) && loader.loader || []
@@ -16,7 +18,7 @@ const findRule = (rulesSource, ruleMatcher) => {
 
 const cssRuleMatcher = (rule) => rule.test && String(rule.test) === String(/\.css$/)
 
-const createLoaderMatcher = (loader) => (rule) => rule.loader && rule.loader.indexOf(`/${loader}/`) !== -1
+const createLoaderMatcher = (loader) => (rule) => rule.loader && rule.loader.indexOf(`${path.sep}${loader}${path.sep}`) !== -1
 const cssLoaderMatcher = createLoaderMatcher('css-loader')
 const postcssLoaderMatcher = createLoaderMatcher('postcss-loader')
 const fileLoaderMatcher = createLoaderMatcher('file-loader')