/**
 * Options for {@link UnknownError}.
 */
export interface UnknownErrorOptions extends ErrorOptions {
    message?: string | undefined;
    reason?: unknown;
}
/**
 * An error thrown when the root problem is unknown.
 */
export declare class UnknownError extends Error {
    readonly name = "UnknownError";
    readonly reason: unknown;
    constructor(options?: UnknownErrorOptions);
}
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