feat: enhance fetch-worker path fixing with robust pattern matching

- Improved postbuild.mjs script with additional regex pattern for arrow functions
- Fixed webpack externals configuration syntax
- Resolved import path issues in ruby-to-blocks-converter
- Enhanced pattern detection for worker-loader generated code

This completes the GitHub Pages publicPath fix to ensure sprite/background
selection functionality works correctly on subdirectory deployments.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <[email protected]>

Author: takaokouji

scripts/postbuild.mjs

@@ -26,24 +26,27 @@ const fixFetchWorkerPaths = (filePath, publicPath) => {
     }
 
     const content = fs.readFileSync(filePath, 'utf8');
-    
+
     // Replace relative "chunks/" paths with absolute paths including publicPath
     const fixedContent = content.replace(
         /return "chunks\/" \+ "fetch-worker"/g,
         `return "${publicPath}chunks/" + "fetch-worker"`
+    ).replace(
+        /[=]>"chunks\/fetch-worker\./g,
+        `=>"${publicPath}chunks/fetch-worker.`
     );
 
-    if (content !== fixedContent) {
+    if (content === fixedContent) {
+        console.info(`No fetch-worker paths found in ${path.relative(basePath, filePath)}`);
+    } else {
         fs.writeFileSync(filePath, fixedContent);
         console.info(`Fixed fetch-worker paths in ${path.relative(basePath, filePath)}`);
-    } else {
-        console.info(`No fetch-worker paths found in ${path.relative(basePath, filePath)}`);
     }
 };
 
-const postbuild = async () => {
+const postbuild = () => {
     const publicPath = process.env.PUBLIC_PATH;
-    
+
     if (!publicPath) {
         console.info('PUBLIC_PATH not set - skipping fetch-worker path fixes');
         return;
@@ -63,13 +66,6 @@ const postbuild = async () => {
     }
 };
 
-postbuild().then(
-    () => {
-        console.info('Post-build script complete');
-        process.exit(0);
-    },
-    e => {
-        console.error('Post-build script failed:', e);
-        process.exit(1);
-    }
-);
+postbuild();
+console.info('Post-build script complete');
+process.exit(0);

src/lib/ruby-to-blocks-converter/constants.js

@@ -43,6 +43,17 @@ const KeyOptions = [
     '9'
 ];
 
+/**
+ * scratch-vm/src/engine/variable.jsからコピー
+ * @const
+ */
+const Variable = {
+    SCALAR_TYPE: '',
+    LIST_TYPE: 'list',
+    BROADCAST_MESSAGE_TYPE: 'broadcast_msg'
+};
+
 export {
-    KeyOptions
+    KeyOptions,
+    Variable
 };

src/lib/ruby-to-blocks-converter/event.js

@@ -1,6 +1,5 @@
 // eslint-disable-next-line import/no-unresolved
-import Variable from 'scratch-vm/src/engine/variable';
-import {KeyOptions} from './constants';
+import {KeyOptions, Variable} from './constants';
 
 const GreaterThanMenu = [
     'LOUDNESS',

src/lib/ruby-to-blocks-converter/index.js

@@ -5,7 +5,7 @@ import log from '../log';
 import Blockly from 'scratch-blocks';
 import RubyParser from '../ruby-parser';
 // eslint-disable-next-line import/no-unresolved
-import Variable from 'scratch-vm/src/engine/variable';
+import {Variable} from './constants';
 
 import Primitive from './primitive';
 import {RubyToBlocksConverterError} from './errors';
@@ -588,7 +588,7 @@ class RubyToBlocksConverter {
             SoundConverter,
             SensingConverter
         ];
-        
+
         for (let i = 0; i < legacyConverters.length; i++) {
             const converter = legacyConverters[i];
             if (Object.prototype.hasOwnProperty.call(converter, handlerName)) {

webpack.config.js

@@ -101,9 +101,9 @@ const distConfig = baseConfig.clone()
         },
         output: {
             path: path.resolve(__dirname, 'dist')
-        }
+        },
+        externals: ['react', 'react-dom']
     })
-    .addExternals(['react', 'react-dom'])
     .addPlugin(
         new CopyWebpackPlugin({
             patterns: [