/**
 * Whether a URL is a Firebase passwordless sign-in link. Links can take
 * multiple forms:
 *
 * 1. Raw link from the sign-in email (auth/links): `https://waha-app-db.firebaseapp.com/__/auth/links?link=https://waha-app-db.firebaseapp.com/__/auth/action?apiKey%3D<api_key>%26mode%3DsignIn%26oobCode%3D<oob_code>%26continueUrl%3Dhttps://web.waha.app/auth`
 * 2. Unwrapped url (auth/action): `https://waha-app-db.firebaseapp.com/__/auth/action?apiKey=<api_key>&mode=signIn&oobCode=<oob_code>&continueUrl=https://web.waha.app/auth`
 * 3. Universal Link (iOS) / App Link (Android) deep-link: `https://web.waha.app/auth?apiKey=<key>&oobCode=<oob_code>&mode=signIn`
 */
export declare function isMagicSignInLink(url: URL): boolean;
/**
 * Base64url-encodes a Firebase sign-in URL for transport in a deep-link query
 * param. `expo-router` has trouble with urls as query params.
 */
export declare function encodeMagicLinkToken(url: string): string;
/** Reverses {@link encodeMagicLinkToken}. */
export declare function decodeMagicLinkToken(token: string): string | null;
/**
 * Builds a custom-scheme deep-link that the app can receive directly for
 * signing in.
 */
export declare function buildOpenInAppUrl(signInUrl: string): string;