isZod

[alii]

Hi everyone, hope all is well.

I wondered if there was a method to check if something was a zod schema. I'm working with a complex signature right now for something and a value I have could be one of three things, a schema, a function argument or a zod schema. I was looking for something like z.isZod(something); but wasn't able to find it.

What would be the best way to do this?

[digimuza]

You can easily check

z.ZodType is base class for all zod schemas so you easily can do

const schema = z.object({})
if (schema instanceof z.ZodType) {
// this is zod type
}

If you want more specific checks

if (schema instanceof z.ZodObject) {
// this is zod object type 
}

[colinhacks]

If you're looking create a Zod schema for ZodType, you can do this:

z.instanceof(z.ZodType);

[MentalGear]

An official method would be needed, as obj instanceof z.ZodType is just not working.

[eric-poitras]

@MentalGear is right. I got some cases when using esbuild where the prototype chain gets broken (for some reason I am still investigating) and instanceof is not working. It would be nice to have an official type guard not based on prototypes to validate a zod schema.

@MentalGear How have you resolved your issue? Did you write your own type guard?