import type { CredentialPayload, CredStoreLike } from './in-memory-cred-store.js';
interface KvHttp {
    request(method: string, url: string, data?: Uint8Array | Buffer, headers?: Record<string, string>): Promise<{
        status: number;
        body: Uint8Array | Buffer;
    }>;
}
interface PerSubCredStoreOptions {
    http?: KvHttp;
}
/**
 * Validate the decrypted credential blob before trusting it (carryover from the
 * closed #851). A blob must be an object whose `accounts` is an array of
 * well-formed AccountConfig. Extra fields (e.g. `outlookTokens`) pass through.
 */
export declare function isValidCredentialPayload(data: unknown): data is CredentialPayload;
export declare class PerSubCredStore implements CredStoreLike {
    private cache;
    private backend;
    constructor(opts?: PerSubCredStoreOptions);
    private storeFor;
    save(sub: string, creds: CredentialPayload): Promise<void>;
    load(sub: string): Promise<CredentialPayload | null>;
    clear(sub: string): Promise<void>;
    listSubs(): Promise<string[]>;
    ready(): Promise<void>;
}
export {};
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