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Frontend/erp-system/lib/validations.ts

@@ -1,19 +1,16 @@
 import { z } from "zod"
 
-// Treats null/undefined as missing so validation surfaces one clear
-// "required" message instead of a generic type error.
+// Plain z.string(), not z.preprocess(): preprocess widens the schema's INPUT type to
+// `unknown`, so zodResolver produced a Resolver<{email: unknown, …}> that could not be
+// assigned to useForm<LoginValues> — the long-standing type error on the login page.
+// Form fields always yield strings (RHF defaults them to ""), so the null/undefined
+// coercion it was guarding against cannot occur here.
 function requiredString(message: string) {
-	return z.preprocess(
-		(val) => (val === null || val === undefined ? "" : val),
-		z.string().min(1, message)
-	)
+	return z.string().min(1, message)
 }
 
 // Email validation schema
-export const emailSchema = z.preprocess(
-	(val) => (val === null || val === undefined ? "" : val),
-	z.string().min(1, "Email is required").email("Enter a valid email")
-)
+export const emailSchema = z.string().min(1, "Email is required").email("Enter a valid email")
 
 // Login schema (email + password) for reuse across the app
 export const loginSchema = z.object({