v9.4.5-canary.39

Patches

• Add missing gitignore files: b8bd3c3
• [internal] Fix Fast Refresh tests on macOS: #15300
• Do not duplicate compilation errors: #15299
• Verify that dataroutes work correctly with assetPrefix: #15309
• Add test for main.js in webpack.config.js: #15311

Credits

Huge thanks to @Janpot and @timneutkens for helping!