All files / features/auth decideLinkVsRecover.ts

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/**
 * Anonymous-first identity: connecting a provider first tries to LINK it onto the
 * current anonymous account. If that provider/email already belongs to another
 * Firebase user (reinstall, new device, partner re-connecting), the link fails and
 * we must instead SIGN IN to recover that existing account — discarding the
 * throwaway anonymous uid. This pure helper maps the link error to that decision.
 */
export type LinkFailureAction = "recover" | "rethrow";
 
// Firebase Auth error codes that mean "this credential already identifies an account",
// i.e. the user should be recovered via sign-in rather than linked.
const RECOVERABLE_CODES = new Set([
  "auth/credential-already-in-use",
  "auth/email-already-in-use",
  "auth/account-exists-with-different-credential",
]);
 
export function decideLinkVsRecover(errorCode: string | undefined): LinkFailureAction {
  return errorCode && RECOVERABLE_CODES.has(errorCode) ? "recover" : "rethrow";
}