export type DataOrError<T> = {
    data: T;
    err?: undefined;
} | {
    data?: undefined;
    err: BaseError;
};
export declare class BaseError extends Error {
    readonly namespace: string;
    readonly type: string;
    readonly message: string;
    readonly data?: unknown | undefined;
    constructor(namespace: string, type: string, message: string, data?: unknown | undefined);
}
export declare class MissingThemeError extends BaseError {
    constructor(namespace: string);
}
export declare class MissingChartError extends BaseError {
    constructor(namespace: string, chartIdentifier: string);
}
export declare class UnsupportedMethodError extends BaseError {
    constructor(namespace: string, method: string);
}
export declare class FailedToFetchError extends BaseError {
    constructor(namespace: string, subject: string, reason?: string, data?: unknown);
}
export declare class IllegalArgumentError extends BaseError {
    constructor(namespace: string, detail: string, data?: unknown);
}