add registration and session logic

src/app/lib/definitions.ts

@@ -0,0 +1,31 @@
+import * as z from 'zod'
+
+export const SignupFormSchema = z.object({
+	name: z
+		.string()
+		.min(2, { error: 'Name must be at least 2 characters long.' })
+		.trim(),
+	email: z.email({ error: 'Please enter a valid email.' }).trim(),
+	password: z
+		.string()
+		.min(5, { error: 'Be at least 5 characters long' })
+		.regex(/[a-zA-Z]/, { error: 'Contain at least one letter.' })
+		.regex(/[0-9]/, { error: 'Contain at least one number.' })
+		.trim(),
+})
+
+export type FormState =
+	| {
+		errors?: {
+			name?: string[]
+			email?: string[]
+			password?: string[]
+		}
+		message?: string
+	}
+	| undefined
+
+export type FormAction = (
+	state: FormState,
+	formData: FormData
+) => Promise<FormState>