Check if .mapmodules exisits before running

Author: jsnanigans

lib/purgecss-webpack-plugin.es.js

@@ -141,13 +141,13 @@ var files = function files(chunk) {
     var getter = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : function (a) {
         return a;
     };
-    return chunk.modules.map(function (module) {
+    return chunk.mapModules ? chunk.mapModules(function (module) {
         var file = getter(module);
         if (!file) return null;
         return extensions.indexOf(path.extname(file)) >= 0 && file;
     }).filter(function (a) {
         return a;
-    });
+    }) : [];
 };
 
 var styleExtensions = ['.css', '.scss', '.styl', '.sass', '.less'];

lib/purgecss-webpack-plugin.js

@@ -145,13 +145,13 @@ var files = function files(chunk) {
     var getter = arguments.length > 2 && arguments[2] !== undefined ? arguments[2] : function (a) {
         return a;
     };
-    return chunk.modules.map(function (module) {
+    return chunk.mapModules ? chunk.mapModules(function (module) {
         var file = getter(module);
         if (!file) return null;
         return extensions.indexOf(path.extname(file)) >= 0 && file;
     }).filter(function (a) {
         return a;
-    });
+    }) : [];
 };
 
 var styleExtensions = ['.css', '.scss', '.styl', '.sass', '.less'];

src/search.js

@@ -19,10 +19,12 @@ export const assets = (assets = [], extensions = []) =>
         .filter(a => a)
 
 export const files = (chunk, extensions = [], getter = a => a) =>
-    chunk.modules
-        .map(module => {
-            const file = getter(module)
-            if (!file) return null
-            return extensions.indexOf(path.extname(file)) >= 0 && file
-        })
-        .filter(a => a)
+    chunk.mapModules
+        ? chunk
+              .mapModules(module => {
+                  const file = getter(module)
+                  if (!file) return null
+                  return extensions.indexOf(path.extname(file)) >= 0 && file
+              })
+              .filter(a => a)
+        : []