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Not null

Sometimes you can be sure something's not null, but Kysely isn't able to infer it. For example calling where('last_name', 'is not', null) doesn't make last_name not null in the result type, but unless you have other where statements you can be sure it's never null.

Kysely has a couple of helpers for dealing with these cases: $notNull() and $narrowType. Both are used in the following example:

More examples

The API documentation is packed with examples. The API docs are hosted here, but you can access the same documentation by hovering over functions/methods/classes in your IDE. The examples are always just one hover away!

For example, check out these sections: