Function signIn

packages/auth-client/src/client/index.tsx:246–323

(
  provider?: LiteralUnion<
    P extends RedirectableProviderType
      ? P | BuiltInProviderType
      : BuiltInProviderType
  >,
  options?: SignInOptions,
  authorizationParams?: SignInAuthorizationParams
)

 *
 */
export async function signIn<
  P extends RedirectableProviderType | undefined = undefined
>(
  provider?: LiteralUnion<
    P extends RedirectableProviderType
      ? P | BuiltInProviderType
      : BuiltInProviderType
  >,
  options?: SignInOptions,
  authorizationParams?: SignInAuthorizationParams
): Promise<
  P extends RedirectableProviderType ? SignInResponse | undefined : undefined
> {
  const { callbackUrl = window.location.href, redirect = true } = options || {};

  const baseUrl = __LINEN_AUTH.basePath;
  const providers = await getProviders();

  if (!providers) {
    window.location.href = `${baseUrl}/error`;
    return;
  }

  if (!provider || !(provider in providers)) {
    window.location.href = `${baseUrl}/signin?${new URLSearchParams({
      callbackUrl,
    })}`;
    return;
  }

  const isCredentials = providers[provider].type === 'credentials';
  const isEmail = providers[provider].type === 'email';
  const isSupportingReturn = isCredentials || isEmail;

  const signInUrl = `${baseUrl}/${
    isCredentials ? 'callback' : 'signin'
  }/${provider}`;

  const _signInUrl = `${signInUrl}?${new URLSearchParams(authorizationParams)}`;

  const res = await fetch(_signInUrl, {
    method: 'post',
    headers: {
      'Content-Type': 'application/x-www-form-urlencoded',
    },
    // @ts-expect-error
    body: new URLSearchParams({
      ...options,
      csrfToken: await getCsrfToken(),
      callbackUrl,
      json: true,
    }),
  });

  const data = await res.json();

  // TODO: Do not redirect for Credentials and Email providers by default in next major
  if (redirect || !isSupportingReturn) {