export type WebAppSessionFetch = (input: string, init?: {
    method?: string;
    headers?: Record<string, string>;
    body?: string;
}) => Promise<Response>;
export interface WebAppSessionExchangeParams {
    urlId: string;
    sessionBaseUrl: string;
    code?: string;
    refreshToken?: string;
    fetch?: WebAppSessionFetch;
}
export interface WebAppSession {
    token: string;
    refreshToken: string;
    expiresIn: number;
    expiresAt: string;
    deadlineMs: number;
    sessionDeadlineMs: number;
}
export declare class WebAppSessionError extends Error {
    readonly status?: number;
    readonly terminal: boolean;
    constructor(message: string, status?: number, terminal?: boolean);
}
export declare const exchangeWebAppSession: (params: WebAppSessionExchangeParams) => Promise<WebAppSession>;
export declare const readWebSessionCodeFromLocation: () => string | undefined;
export interface WebAppBoot {
    urlId: string;
    phyhubUrl: string;
    sessionBaseUrl: string;
}
export declare const loadWebAppBoot: (fetchImpl?: WebAppSessionFetch) => Promise<WebAppBoot | null>;
export declare const clearWebSessionCodeFromLocation: () => void;
export declare const WEB_SESSION_STORAGE_KEY_PREFIX = "phystack:web-session:";
export declare const STORED_WEB_SESSION_VERSION = 1;
export interface StoredWebSession {
    v: number;
    refreshToken: string;
    sessionDeadlineMs: number;
    urlId: string;
    savedAt: number;
}
export interface WebSessionStorageLike {
    getItem(key: string): string | null;
    setItem(key: string, value: string): void;
    removeItem(key: string): void;
}
export declare const readStoredWebSession: (urlId: string, storage?: WebSessionStorageLike | null) => StoredWebSession | null;
export declare const writeStoredWebSession: (record: StoredWebSession, storage?: WebSessionStorageLike | null) => boolean;
export declare const clearStoredWebSession: (urlId: string, storage?: WebSessionStorageLike | null) => void;
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