Custom error message shape

[JadowityHerbatnik]

Consider the following schema:

export const FileToUpload = z
  .instanceof(File)
  .refine((file) => file.size < FILE_SIZE_LIMIT, {
    message: `File size should be less than ${FILE_SIZE_LIMIT_MB} MB`,
  });

I'm using react-intl package from FormatJS for providing i18n and would like to be able to return a translation object instead of instead of a string, like:

export const FileToUpload = z
  .instanceof(File)
  .refine((file) => file.size < FILE_SIZE_LIMIT, {
    message: {
      id: 'uploaded_file_size',
      defaultMessage: `File size should be less than {max} MB`,
      values: { max: FILE_SIZE_LIMIT_MB },
    },
  });

The first solution that naturally comes to mind is this:

const useFileTuUploadSchema = () => {
  const intl = useIntl();

  return z.instanceof(File).refine((file) => file.size < FILE_SIZE_LIMIT, {
    message: intl.formatMessage({
      id: 'uploaded_file_size',
      defaultMessage: `File size should be less than {max} MB`,
      values: { max: FILE_SIZE_LIMIT_MB },
    }),
  });
};

Unfortunately, it doesn't solve my issue, because I need access to the actual translation object, not a formatted string (I render all translations in a custom component that allows admins to edit translations on the frontend)

Interestingly enough, returning a translation object instead of a string seems to work fine, but it's a terrible hack and would require shutting typescript errors, so do you have any suggestion here?
Thanks a lot!

[JacobWeisenburger]

Is this what you are looking for?

const FILE_SIZE_LIMIT = 123456789
const FileToUpload = z.instanceof( File ).superRefine( ( file, ctx ) => {
    if ( file.size < FILE_SIZE_LIMIT ) return true
    ctx.addIssue( {
        code: 'custom',
        message: `File size should be less than ${ FILE_SIZE_LIMIT } MB`,
        params: {
            id: 'uploaded_file_size',
            max: FILE_SIZE_LIMIT,
        },
    } )
} )

If you found my answer satisfactory, please consider supporting me. Even a small amount is greatly appreciated. Thanks friend! 🙏
https://github.com/sponsors/JacobWeisenburger

[JacobWeisenburger]

Perhaps this could also help:
i18n with Zod | Internationalizing Zod Messages with React/Next.js

[JadowityHerbatnik]

Is this what you are looking for?

const FILE_SIZE_LIMIT = 123456789
const FileToUpload = z.instanceof( File ).superRefine( ( file, ctx ) => {
    if ( file.size < FILE_SIZE_LIMIT ) return true
    ctx.addIssue( {
        code: 'custom',
        message: `File size should be less than ${ FILE_SIZE_LIMIT } MB`,
        params: {
            id: 'uploaded_file_size',
            max: FILE_SIZE_LIMIT,
        },
    } )
} )

Oh yeah, that'll do, thank you!

[exelimpichment]

  resume: z.instanceof(File).refine((file) => file.size < 4000000, {
    message: 'Your resume must be less than 4MB.',
  }),
  
  

you can also do it like this