Add option historyApiFallback

Author: drudrum

src/options.json

@@ -48,6 +48,14 @@
         }
       ]
     },
+    "historyApiFallback": {
+      "description": "When using the HTML5 History API, the index.html page will likely have to be served in place of any 404 responses. Enable historyApiFallback by setting it to true",
+      "anyOf": [
+        {
+          "type": "boolean"
+        }
+      ]
+    },
     "stats": {
       "description": "Stats options object or preset name.",
       "anyOf": [

src/utils/getFilenameFromUrl.js

@@ -53,8 +53,11 @@ export default function getFilenameFromUrl(context, url) {
         filename = path.join(outputPath, querystring.unescape(pathname));
       }
 
-      let fsStats;
+      if (!context.outputFileSystem.existsSync(filename) && options.historyApiFallback){
+        filename = path.join(outputPath);
+      }
 
+      let fsStats;
       try {
         fsStats = context.outputFileSystem.statSync(filename);
       } catch (_ignoreError) {