How to get keys of values of an interface

[calm eagle]

Why the type of name is string | number | symbol and how can i fix it

[delicate gust]

!screenshot

[young valve]

`!screenshot`:

Rather than screenshots, please provide either code formatted as:

```ts
// code here
```
Or even better, as an example on the TypeScript playground that is as simple as possible and reproduces the issue. This makes it easier to help you and increases the chances of getting an answer.

[young valve]

Juhan280#0965

Playground Link

Preview:```ts
// types/Database.ts
export interface MainDB {
guild: { id: string; prefix: string };
}

export interface TestDB {
[key: string]: object;
}

export default interface Databases {
main: MainDB;
test: TestDB;
}

// classes/Database.ts
import { Document, MongoClient, ServerApiVersion } from "mongodb";
...```

You can choose specific lines to embed by selecting them before copying the link.

Nctdt#2630

Playground Link

Preview:```ts
...
on<
DBName extends keyof Databases,
CName extends keyof Databases[DBName] & string

(dbName: DBName, name: CName) {
return this.client.db(dbName).collection(name)
}
...```

[fierce flame]

like the above snippet?

[calm eagle]

yes, but now how can i do this

[young valve]

Juhan280#0965

Playground Link

Preview:```ts
export interface MainDB {
guild: {id: string; prefix: string}
}

export interface TestDB {
[key: string]: object
}

export default interface Databases {
main: MainDB
test: TestDB
}

import {
Document,
MongoClient,
ServerApiVersion,
} from "mongodb"
...```

You can choose specific lines to embed by selecting them before copying the link.

[fierce flame]

@calm eagle

[young valve]

Nctdt#2630

Playground Link

Preview:```ts
import {
Document,
MongoClient,
ServerApiVersion,
} from "mongodb"
export type MainDB = {
guild: {id: string; prefix: string} & Document
[k: string]: Document
}

export type TestDB = Record<string, Document>

type Databases = {
main: Mai
...```

You can choose specific lines to embed by selecting them before copying the link.

[calm eagle]

I don't want to use any name in main db

It should only have the collection i defined

[fierce flame]

only main db?

[calm eagle]

All db other than "test"

[fierce flame]

okay

[young valve]

Nctdt#2630

Playground Link

Preview:ts ... return this.client .db(dbName) .collection(name) as Databases[DBName][CName] ...

[fierce flame]

like this

[young valve]

Juhan280#0965

Playground Link

Preview:```ts
...
public getCollection<
DBName extends keyof Databases,
CName extends keyof Databases[DBName] & string

(dbName: DBName, name: CName) {
return this.client
.db(dbName)
.collection(name) as Collection<
Databases[DBName][CName]

}
}

new Database("").getCollection("main", "guild")```

[calm eagle]

it should return the value inside Collection<>

Cuz later findOne would use that type from that

[fierce flame]

oh, I didn't see the collection

[calm eagle]

btw, something like that not possible?

[fierce flame]

hmm... because that's conditional type with extends keyword is not in the interface context

[calm eagle]

How else can I fix it

[fierce flame]

like my example

use &

[calm eagle]

Ohh

[calm eagle]

What does & do btw

[fierce flame]

https://www.typescriptlang.org/docs/handbook/typescript-in-5-minutes-func.html#intersections

[calm eagle]

The name is intersection, but it doesn't behave like an intersection operator in math

But anyways

!solved

!resolved

[fierce flame]

u can use name as string