Error message based on input value

[joaoGabriel55]

Issue: #3048

Generate error message based on the input value

z
  .string({ invalid_type_error: value => 'Expected a string, received: ' + String(value) })
  .min(2, { message: value => 'Expected a string with at least 2 characters, received: ' + String(value) })

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[colinhacks]

Thanks Gabriel. I think if we were going to support a function here, it should conform to the ZodErrorMap interface. Essentially you'd be providing an error map that would be used whenever this is error happens.

export type ZodErrorMap = (
  issue: ZodIssueOptionalMessage,
  _ctx: ErrorMapCtx
) => { message: string };

This is a pretty major project, since it should be supported everywhere consistently, including in all the schema constructors, not just z.string().

Also, the ZodErrorMap type definition will be changing (slightly) in Zod 4 😅 I think this is a great API and I'm putting this on my list of Zod 4 features, but it's probably better that I implement it. I really appreciate your work here though, and it's a great PR!