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Vistas"TypeError: can't convert undefined to object" only after vite build, before, with vide dev, everything works perfectly
I'm using Vite combined with React and Typescript.
When I run vite dev the live version of the website runs perfectly, not even errors on the console.
When I run vite build and then vite preview all I get to see is a white page and the
TypeError: can't convert undefined to object
error in the console.
I cannot trace the problem in my code because the error happens after the build/minimization, but just to be sure, I added safety checks in the instances where I call Object.keys().
This is the segment of the code where the error starts:
Object.keys(pd).forEach(function (e) {
if (pd[e] === 0)
Xd.prototype["on" + e] = function () {
this.scope.emit(e);
};
else if (pd[e] === 1)
Xd.prototype["on" + e] = function (t) {
this.scope.emit(e, t);
};
});
Edit:
I was checking the minimized code and right before the long block of code where the bug is, I saw a MuiTouchRipple. I'm using the MaterialUI library, is it possible that the library is causing this problem? I tried to update from version 5.4.2 to 5.6.3, but after the build it still crashes.
1 Respuestas
Responde la pregunta0
I managed to fix it.
Posting the debug steps for the newbies like me.
Debug
1. Disable minimization
This allows you to see the original code, it's still in a bundled form, so you still cannot identify the exact file where the problem is, but at least you know something more. (in my specific case, since I'm using vite I had to change a variable in the config file, see https://vitejs.dev/config/#build-minify).
2. Change typescript compiler options
In my case the target and module were set to ESNext, trying to change it to ES6 or to commonjs helped to have a better searchable code. (see https://www.tsmean.com/articles/learn-typescript/typescript-module-compiler-option/)
3. Search the code that causes the error
When I tried to search the code in vscode it did not appear. That's a good sign, at least my code was not causing the problem!
But at the same time: what now?
The solution I found is to either disable vscode excluded folders from the search (by default vscode does not search in node_modules), or to use grep -r in the project folder.
I found the latter to be faster and more efficient.
Solution
In my specific case the problem was an old library that hasn't been updated in years (https://www.npmjs.com/package/react-html-parser). Once I removed it everything started working.