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I know higher kinded types aren't currently supported by TypeScript and that there's an issue here for them. I found this npm package (hkts) which is designed to help with some cases; but unfortunately I haven't been able to get it to work for me.
Someone in the deno std lib achieved to make a deep merge which keep typing by infering a new type based on a merged T1 and T2, maybe you could take inspiration on it?
Yes, you can do this if you use a higher-kinded type for TestMergeFn instead of a function type. I'll use the HKT implementation from fps-ts because it has had more work put into it than hkts.
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