Quick Fix: By adding if (import.meta.hot) condition, Vite will only trigger hot module replacement for specific module changes, like component or styles, instead of reloading the entire page for every change.
The Problem:
In a React project using Vite, it was observed that on every code change, instead of doing a Hot Module Replacement (HMR) update, the entire page was being reloaded. This issue arose after updating to the latest version of Vite, causing a slow and inconvenient development experience. The addition of import.meta.hot.accept() in the index.js file resolved the HMR issue but led to a build failure with the error: "Cannot read properties of undefined (reading ‘accept’)". This problem has impacted the development flow and requires a solution to enable HMR updates without causing build errors.
The Solutions:
Solution 1: Use Hot Module Reloading (HMR) with conditional statement
To fix the full page reload issue and enable Hot Module Reloading (HMR) updates, add the following code to your index.js file:
if (import.meta.hot) {
import.meta.hot.accept();
}
This code block checks if HMR is available (i.e., if the import.meta.hot object exists) and, if so, it enables HMR updates for the current module. When a change is made to a module that is being HMR-ed, the accept() method will be called, triggering an HMR update instead of a full page reload.
By adding this conditional statement, you can enable HMR for modules that support it while preventing errors in modules that do not. This ensures that your development experience remains smooth and efficient, with HMR updates for supported modules and graceful fallback to full page reloads for unsupported modules.
Q&A
Why is Vite causing full page reload on every change?
—
The issue is likely due to a change in Vite’s behavior in newer versions.
What is the fix for the full page reload issue?
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Add import.meta.hot.accept() in your index.js file, but make sure it’s wrapped in an if (import.meta.hot) conditional check.
What is the reason for the if (import.meta.hot) conditional check?
—
The if condition is necessary because import.meta.hot is only defined in development mode.
Video Explanation:
The following video, titled "Setting up vite, React, TypeScript, eslint, prettier, vitest, testing ...", provides additional insights and in-depth exploration related to the topics discussed in this post.
... reloading and auto refresh 00:08:36 setup eslint 00 ... All 12 useState & useEffect Mistakes Junior React Developers Still Make in 2024.
