Mongoose slows down performance of VSCode (TSServer) by a lot

[ShadiestGoat]

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

bug

What is the current behavior?

It slows down vscode by a lot, even with small projects. I have a very small project, with like 2 small schemas, and the 2 other files, containing on average 160 lines of code, and vscode slows down a lot as soon as I install mongoose. This does not happen when I install most other libraries (haven't tested them all lmao). If I uninstall mongoose, it comes back and works perfectly normal.
To clarify "slowing down" means that typescript language server needs 3-5 seconds to realise that I'm importing somethign invalid, and just vscode in general to realise I'm importing something that's never used takes around 2-4 seconds. Usually it happens in under a second so like.. you know...
And it's not like vscode is taking a lot of ram/cpu either, it just grows slow.
Btw I think this is a mongoose issue, since it happens with no other library, its a special case here
Reloading typescript server or project doesn't help

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

Have vscode to edit your code
Install mongoose on your current project (npm i mongoose

My tsconfig.json:

{
    "compilerOptions": {
        "allowJs": true,
        "moduleResolution": "Node",
        "esModuleInterop": true,
        "target": "ES6",
        "resolveJsonModule": true,
        "outDir": "./dist",
        "checkJs": true,
        "module": "CommonJS",
        "lib": ["ESNext"]
    },
    "include": ["src"]
}

What is the expected behavior?

It to not be like this, lmao.

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

Node: v16.2.0
Mongoose: 5.12.13
Linux: 5.12.7-arch1-1

[vkarpov15]

Interesting, can you please provide an example project that demonstrates this? I haven't noticed this but I might be missing something.

[ShadiestGoat]

Mm well I can replicate it with very little:

import { model, Model, Schema } from "mongoose";

export interface UserSH {
    username: string,
    password: string,
    maxMb: number,
    submitted: string[],
    id: string
}

export const UserSchema = new Schema<UserSH, Model<UserSH>, UserSH>({
    id: "string",
    maxMb: "number",
    username: "string",
    submitted: ["string"],
    password: "string"
})


uiyasdjklsadias //error this baby is undefined

The thing that 'triggers' it is creating the schema. If I just remove the schema creation, its all good

(the only files in the project are the default ones, mongoose, typescript@4.3.2, and src/index.ts, contents of which are above. Otherwise its newly created)

[mjfwebb]

I can confirm that I am also experiencing a degradation in Typescript performance due to Mongoose.

[jasonwwl]

me too

[cainaf]

I can confirm that too.

I was using @types/mongoose before and just removed it in favor of mongoose own type definitions. It was like snapping two fingers, boom, vscode was now super slow. Simple autocompletes and validations are taking now over 5 or even 10 seconds sometimes in all project files.

[xiaoxin-sky]

我也能够明显感觉到，mongoose 使得 vscode 加载类型提示变慢。但是仅限于加载 mongoose 相关的内容变慢。

[ShadiestGoat]

Really? For me it slows all content, not just mongoose related...

[cainaf]

Same as @ShadiestGoat for me. Even eslint gets very slow. If I delete index.d.ts from mongoose lib inside node_modules, performance of everything becomes instant again.

[fercg16]

I can confirm it slows down all the content for me too.

I did as @cainaf said to verify it was mongoose, I deleted index.d.ts and..., vs code was running fine as hell again.
I restored index.d.ts and the performance heavily dropped down again.