/**
 * Cross-platform credential storage.
 *
 * Provides a unified interface for securely storing and retrieving
 * credentials across macOS, Windows, and Linux.
 *
 * | Platform | Mechanism                                              |
 * |----------|--------------------------------------------------------|
 * | macOS    | System Keychain via `security` CLI                     |
 * | Windows  | Windows Credential Manager via keytar (native wincred) |
 * | Linux    | `secret-tool` (libsecret) if available, else file with |
 * |          | 0o600 perms at ~/.config/teams-api/                    |
 */
export interface CredentialStore {
    save(account: string, data: string): Promise<void>;
    load(account: string): Promise<string | null>;
    clear(account: string): Promise<void>;
}
export declare function createCredentialStore(): CredentialStore;
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