Function signIn

src/react/index.tsx:175–247

(
  provider?: LiteralUnion<BuiltInProviderType>,
  options?: SignInOptions,
  authorizationParams?: SignInAuthorisationParams
)

 * [Documentation](https://next-auth.js.org/getting-started/client#signin)
 */
export async function signIn<
  P extends RedirectableProviderType | undefined = undefined
>(
  provider?: LiteralUnion<BuiltInProviderType>,
  options?: SignInOptions,
  authorizationParams?: SignInAuthorisationParams
): Promise<
  P extends RedirectableProviderType ? SignInResponse | undefined : undefined
> {
  const { callbackUrl = window.location.href, redirect = true } = options ?? {}

  const baseUrl = apiBaseUrl(__NEXTAUTH)
  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()

  if (redirect || !isSupportingReturn) {
    const url = data.url ?? callbackUrl
    window.location.href = url
    // If url contains a hash, the browser does not reload the page. We reload manually
    if (url.includes("#")) window.location.reload()
    return