export interface OAuthCredentials {
    refresh: string;
    access: string;
    expires: number;
}
export type OAuthFlowState = {
    step: "idle";
} | {
    step: "awaiting-code";
    verifier: string;
    oauthState?: string;
} | {
    step: "exchanging";
} | {
    step: "connected";
} | {
    step: "error";
    message: string;
};
export declare const OAUTH_PROVIDERS: Record<string, {
    label: string;
    buttonText: string;
}>;
import type { StorageNamespace } from "../context";
export declare function loadOAuthCredentials(ns: StorageNamespace, provider: string): OAuthCredentials | null;
export declare function saveOAuthCredentials(ns: StorageNamespace, provider: string, creds: OAuthCredentials): void;
export declare function removeOAuthCredentials(ns: StorageNamespace, provider: string): void;
export declare function generatePKCE(): Promise<{
    verifier: string;
    challenge: string;
}>;
export declare function buildAuthorizationUrl(provider: string, challenge: string, verifier: string): {
    url: string;
    oauthState?: string;
};
export declare function refreshOAuthToken(provider: string, refreshToken: string, proxyUrl: string, useProxy: boolean): Promise<OAuthCredentials>;
export declare function exchangeOAuthCode(params: {
    provider: string;
    rawInput: string;
    verifier: string;
    expectedState?: string;
    useProxy: boolean;
    proxyUrl: string;
}): Promise<OAuthCredentials>;
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