QueryCursor.js is throwing an error on line 144: "TypeError: Cannot assign to read only property 'map' of object '#<QueryCursor>'"

[balonsom]

Do you want to request a feature or report a bug?

Bug

What is the current behavior?

QueryCursor.js is throwing an error on line 144:

QueryCursor.prototype.map = function(fn) {

Trying to assign to read only property 'map' of object

TypeError: Cannot assign to read only property 'map' of object '#<QueryCursor>'
    at Object.<anonymous> (/Users/balonsom/Documents/repos/dungeon-master/node_modules/mongoose/lib/cursor/QueryCursor.js:144:27)
    at Module._compile (node:internal/modules/cjs/loader:1097:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1151:10)
    at Module.load (node:internal/modules/cjs/loader:975:32)
    at Function.Module._load (node:internal/modules/cjs/loader:822:12)
    at Module.require (node:internal/modules/cjs/loader:999:19)
    at require (node:internal/modules/cjs/helpers:102:18)
    at Object.<anonymous> (/Users/balonsom/Documents/repos/dungeon-master/node_modules/mongoose/lib/query.js:12:21)
    at Module._compile (node:internal/modules/cjs/loader:1097:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1151:10)

If the current behavior is a bug, please provide the steps to reproduce.

This bug only arose when I upgrade Node.js to v17.5.0. I don't think I can easily provide a script to replicate.

What is the expected behavior?

QueryCursor.js should not throw an error.

What are the versions of Node.js, Mongoose and MongoDB you are using? Note that "latest" is not a version.

Mongoose: 6.2.1
Node.js: 17.5.0
MongoDB: 4.4

[abeledovictor]

Same happening to
mongoose 5.7.7
MongoDB 4.4.12
Node 17.5.0

Temp fix: change your package.json engines line to this:

"engines": { "node": ">=12.0.0 <17.5.0" },

[Uzlopak]

I can reproduce it on node 17.5.

@IslandRhythms You dont need a repoductions script.

Just
nvm install 17.5 && nvm use 17.5 && npm t

And voila you get that issue.

[Uzlopak]

Opened ticket in nodejs bugtracker regarding this

nodejs/node#41926

[sc0rp10n-py]

Is there any alternative for now? I am also using this in my project and its crashed now.

[druv5319]

Having the same issues as well. Any fix?

[sc0rp10n-py]

You can change the node version to v14 and the error gets fixed for now.

[druv5319]

Thanks it worked. My application automatically updated the Node engine to 17.5 and didn't realize what was causing the issue.

[ummerirshadk]

Thanks!! It worked

[hemantvishwakarma]

In local working fine but when i deployed on digital ocean Kubernetes server then showing error. please help....

[ummerirshadk]

@hemantvishwakarma
Please try updating your package.json to node 14. Please refer to the below sample.

"engines": {
    "node": "14.x"
  },

[hemantvishwakarma]

x

i am using this pls check node js - v16.13.1