Nestjs warns about "TypeOrmModule" taking a long time to serialize about typeorm HOT 8 CLOSED

Running this locally I'm seeing 0.06 ms - 0.19 ms without the change and 0.07 ms - 0.13 ms with the change with some spikes going up to 1 ms or 2 ms. As I'm using forRootAsync() the only thing being serialized is generateString(), which basically just calls uuid. So it looks like the runtime itself was stalling to produce random values 🤷

Closing for now.

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so what's the issue here?

make sure you're using the latest version of @nestjs/core and @nestjs/common

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Sorry I've just updated the minimum reproduction code.

I'm using 10.3.0 which appears to be the latest version.

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ok but what's the expected behavior?

that's just an warning message, not an error, right? You can see why it exists in the issue nestjs/nest#12738

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I think the expected behavior would be that the TypeORM integration would avoid having a large amount of static data to be serialized?

I would like to find a way to remove that 30 ms extra time per cold start 🤔

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I believe that this is a limitation that we cannot circumvent on the nestjs side yet

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This can probably be fixed by replacing the useValue with useFactory like the original issue

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so please try it out changing the js code of your node_modules/@nestjs/typeorm dir

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