s-private API Documentation - v3.8.1
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    UserId: $ZodBranded<ZodString, "UserId", "out"> = ...

    Zod schema for validating user identifiers.

    Validates that the user ID is a non-empty string. Used for multi-tenant data isolation across all domains.

    const userId = UserId.parse("auth0|123456789");
    

    makeUserId for factory function