import type { FirebaseIdTokenPayload, ServiceAccount } from './firebase-types.js';
import { FirebaseEdgeError } from './errors.js';
type SignJwtResult = {
    data: string;
    error: null;
} | {
    data: null;
    error: FirebaseEdgeError;
};
export declare function verifySessionJWT(sessionCookie: string, projectId: string, fetchFn?: typeof globalThis.fetch): Promise<{
    data: null;
    error: FirebaseEdgeError;
} | {
    error: null;
    data: FirebaseIdTokenPayload;
}>;
export declare function verifyJWT(idToken: string, projectId: string, fetchFn?: typeof globalThis.fetch): Promise<{
    error: FirebaseEdgeError;
    data: null;
} | {
    error: null;
    data: FirebaseIdTokenPayload;
}>;
export declare function signJWT(serviceAccount: ServiceAccount): Promise<SignJwtResult>;
export declare function signJWTCustomToken(uid: string, serviceAccount: ServiceAccount, additionalClaims?: object): Promise<{
    data: null;
    error: FirebaseEdgeError;
} | {
    data: string;
    error: null;
}>;
export {};
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