Uncaught TypeError: Cannot read property 'prototype' of undefined

[misland]

What is the current behavior?
I just import mongoose in a project that initialized by vue-cli 2.0,when I run the project ,an error thrown as the title said,can anyone explain why?thanks!!
here is the detail of error:
Uncaught TypeError: Cannot read property 'prototype' of undefined
at eval (webpack-internal:///./node_modules/mongoose/lib/types/buffer.js:184)
at Array.forEach ()
at Object.eval (webpack-internal:///./node_modules/mongoose/lib/types/buffer.js:183)
at eval (webpack-internal:///./node_modules/mongoose/lib/types/buffer.js:306)
at Object../node_modules/mongoose/lib/types/buffer.js (app.bundle.js:2554)
at webpack_require (app.bundle.js:679)
at fn (app.bundle.js:89)
at Object.eval (webpack-internal:///./node_modules/mongoose/lib/schema/buffer.js:10)
at eval (webpack-internal:///./node_modules/mongoose/lib/schema/buffer.js:225)
at Object../node_modules/mongoose/lib/schema/buffer.js (app.bundle.js:2386)
at webpack_require (app.bundle.js:679)
at fn (app.bundle.js:89)
at eval (webpack-internal:///./node_modules/mongoose/lib/schema/array.js:19)
at Object../node_modules/mongoose/lib/schema/array.js (app.bundle.js:2370)
at webpack_require (app.bundle.js:679)
at fn (app.bundle.js:89)

Please mention your node.js, mongoose and MongoDB version.
Node.js 8.12
mongoose 5.3.5
MongoDB 4.0.3

[nikdunn]

The fix for this issue: #7102 seems to have been what introduces this bug. There is no Buffer property on global when NodeBuffer gets created.

[misland]

The fix for this issue: #7102 seems to have been what introduces this bug. There is no Buffer property on global when NodeBuffer gets created.

thanks my friend

[nikdunn]

Why did you close this Issue? It's not fixed. This should be an open issue.
@misland Can you reopen the issue?
@vkarpov15 I wanted to bring this to your attention. Thanks.

[lineus]

@nikdunn does 5.3.6 fix the issue for you?

[nikdunn]

No, @lineus , 5.3.6 is where the issue is introduced. I was using 5.3.4 and then an npm install bumped me to 5.3.6 where I started experiencing the issue.

[lineus]

this issue was introduced in @5.3.5

I am able to replicate this using a new [email protected] webpack app and just adding the mongoose import statement import mongoose from 'mongoose/browser'; on [email protected].{5,6}. On [email protected] it works without issue.

I am also able to repro this using create-react-app and [email protected].{5,6}.

[misland]

@nikdunn sorry that I didn't quite familar with github issues,@lineus has opened this already

[vkarpov15]

Thanks for helping us find this issue. We started using the core node buffer for a couple use cases to work around a bug in safe-buffer (feross/safe-buffer#23) .

[delucca]

I´m getting the same error on a Jest test suite:

    TypeError: Cannot read property 'prototype' of undefined

      at Object.<anonymous> (node_modules/mongoose/lib/drivers/node-mongodb-native/collection.js:160:28)
      at Object.<anonymous> (node_modules/mongoose/lib/drivers/node-mongodb-native/index.js:8:22)
      at Object.<anonymous> (node_modules/mongoose/lib/index.js:10:27)

Any toughts on how to fix it?

[vkarpov15]

@odelucca can you provide code samples? The original issue had nothing to do with jest and jest has a lot of issues. If you're going to use jest, make sure you read this doc: https://mongoosejs.com/docs/jest.html

[delucca]

@vkarpov15 thanks for the reply. I found out that the issue wasnt with mongoose :)

Thanks!