從需求到交付。

// Email verification, without changing the layout.
export async function sendCode(email: string) {
  if (!isValidEmail(email)) {
    return { error: 'Enter a valid email' }
  }

  const result = await auth.sendCode({ email })
  return { sent: result.ok }
}

@@ -24,7 +24,9 @@
  const { email } = form.values
− await auth.signIn({ email, password })
+ const result = await auth.sendCode({ email })
+ if (result.ok) setStep('verify')
  return result

+ it('rejects an invalid email', ...)
+ it('prevents duplicate requests', ...)