TypeError: Cannot create property 'foo' on boolean 'false' With statements cannot be used with the "esm" output format due to strict mode This is because Vite uses ESM and it is always strict mode inside ESM. Vite cannot handle and does not support code that only runs on non-strict mode (sloppy mode). If the module is imported from a third-party library (that's meant to be used in the browser), it's advised to report the issue to the respective library. We recommend avoiding Node.js modules for browser code to reduce the bundle size, although you can add polyfills manually. This is because Vite does not automatically polyfill Node.js modules. Cannot access "fs.readFile" in client code. Module "fs" has been externalized for browser compatibility. When you use a Node.js module in the browser, Vite will output the following warning. Others # Module externalized for browser compatibility # The easiest way to achieve this is to run npx vite preview. You will need to access the file with http protocol. See Reason: CORS request not HTTP - HTTP | MDN for more information about why this happens. If the HTML file output was opened with file protocol, the scripts won't run with the following error.Īccess to script at 'file:///foo/bar.js' from origin 'null' has been blocked by CORS policy: Cross origin requests are only supported for protocol schemes: http, data, isolated-app, chrome-extension, chrome, https, chrome-untrusted.Ĭross-Origin Request Blocked: The Same Origin Policy disallows reading the remote resource at file:///foo/bar.js. Build # Built file does not work because of CORS error # This can be caused by a circular dependency. If HMR is not handled by Vite or a plugin, a full reload will happen.Īlso if there is a dependency loop, a full reload will happen. If you are running Vite with WSL2, Vite cannot watch file changes in some conditions. Related issue: #964 Vite does not detect a file change #
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