How to correctly type custom plugins? Also unable to register previously working plugins since v6.5.2

[rubek-joshi]

Prerequisites

• I have written a descriptive issue title

Mongoose version

6.6.1

Node.js version

16.14.0

MongoDB version

5.0.5

Operating system

Windows

Operating system version (i.e. 20.04, 11.3, 10)

11

Issue

My custom plugin used to be typed correctly up to version 6.5.1 where I'm basically following this guide. However, starting from v6.5.2 to the current v6.6.1, I get the following:

I was also unable to register the mongoose-unique-validator plugin and being shown the following error in my IDE:

I can't seem to find any info in the docs regarding how to correctly type my custom plugin nor am I sure if this is a bug or a breaking change.

[hasezoey]

Between 6.5.1 and 6.6.1 (the mentioned versions) the types for schema.plugin got more explicit than just any, but no generic case was added to test which broke existing plugins

current workaround is for the plugins to change their types from function pluginFunction(schema: Schema) to function pluginFunction(schema: Schema<any, any, any, any, any>)

i already tried to investigate and update the types, but i could not get it to work, the types always broke at The types returned by discriminator(...) are incompatible between these types (and i could not really update it, see #12457 and #12455)

see #12458 for reproduction