Webpack Failed to compile (create-react-app)

[ksloan]

Redacted -- see https://mongoosejs.com/docs/browser.html

[vkarpov15]

@ksloan I wouldn't recommend using Mongoose 4.x on the client but Mongoose 5.x on the server if that's what you're planning on doing.

[arnaudriegert]

I'm not sure why this issue is closed (and redacted): the link you posted in your last edit doesn't quite answer the issue. On the contrary, it gives the impression that a partial version Mongoose can be used in the browser, which is true, but using this version doesn't solve the bug you encountered and that till seems valid to me.

I imagine I am not the only one in this case: I like the idea of having Mongoose schemas accessible in my React app so I can pre-validate the models on the client side before making a request to the server.
But when I try to bundle it using create-react-app's npm run build, I have the error you originally posted: Mongoose (or at least, lib/utils.js) couldn't be minified. It works fine if I downgrade to v4.13.14 but not on v5. It also works fine with v5 in the development build (unminified) using just npm start.

I'm not an expert in Webpack, Babel and the differences between ES5 and ES6 so I'm not sure if this applies, but in this comment @gaearon indicates that it is the library authors who should take care of the compilation to make sure that the libraries work in the environments they want to support. This seemed like a valid point to me.

Would it make sense to make it so that the v5's mongoose/browser could be minified in create-react-app's build step?

[vkarpov15]

@arnaudriegert OPs comment points to the legacy browser docs, and OP was the one who redacted it, so that was the reason for my response. Can you post what error you're seeing?

[arnaudriegert]

I have the exact same message as OP's original message before it was redacted (as can be seen when clicking on "edited" next to the date).

In order to reproduce, you just need to create-react-app (v1.1) and then import mongoose from 'mongoose/browser.js'; somewhere.

[ksloan]

Sorry I linked to wrong docs -- here is the updated docs that basically say "compile it yourself" https://mongoosejs.com/docs/browser.html