/**
 * No API key / credential was available to dispatch a request.
 *
 * The default message preserves the historical `"No API key for provider: X"`
 * wording, which {@link Flag.AuthFailed}'s regex (`no api key`) keys off — but
 * the flag is also attached structurally so classification never depends on the
 * exact phrasing.
 */
export declare class MissingApiKeyError extends Error {
    readonly provider: string | undefined;
    constructor(provider?: string, message?: string);
}
/** A user-facing login flow required an `onPrompt` callback that was not supplied. */
export declare class OnPromptRequiredError extends Error {
    constructor(providerLabel: string);
}
/** An interactive login asked for an API key but the user supplied an empty value. */
export declare class ApiKeyRequiredError extends Error {
    constructor(message?: string);
}
/**
 * A user cancelled an interactive login / device flow. Classified as an abort
 * so it is never surfaced as a retryable transient failure.
 */
export declare class LoginCancelledError extends Error {
    constructor(message?: string);
}