How can we check if the error is an ZodError?

[andredewaard]

I try to write a function that transforms errors from Zod or from my backend into a readable format. But to do this i need to know if the error thrown is from Zod or my api.
To check if its Zod i try to do what is mentioned here: #515
Which works as long as i use this during development. When i bundle this script with Vite into a library and use it on a project is fails to check if the error is coming from Zod.

Is there any reliable way to check this?

[andredewaard]

My temp fix for this right now it this:

error instanceof Error && 'issues' in error

But i feel like this is really error prone.

[FoodlyEric]

import {ZodError} from 'zod'

error instanceof ZodError

[MikeDabrowski]

What am I doing wrong ?

[Depender-Sethi]

Try this

import { ZodError } from 'zod';

export function isZodError(err: unknown): err is ZodError {
  return Boolean(
    err && (err instanceof ZodError || (err as ZodError).name === 'ZodError'),
  );
}

[xieyuheng]

import {ZodError} from 'zod'

error instanceof ZodError

this does not work when many version of zod is used.

[xieyuheng]

Try this

import { ZodError } from 'zod';

export function isZodError(err: unknown): err is ZodError {
  return Boolean(
    err && (err instanceof ZodError || (err as ZodError).name === 'ZodError'),
  );
}

this does not work when code is minified (bundled).

[xieyuheng]

created a pr for this problem: #3819