export declare class DataFetcher {
    private apiEndpoint;
    constructor(apiEndpoint?: string);
    fetch(_chartId: string, sql: string, sqlParams: Array<{
        name: string;
        position: number;
        literalValue?: unknown;
    }>, variables?: Record<string, unknown>, connectionId?: string): Promise<{
        columns: Array<{
            name: string;
            type: string;
        }>;
        rows: Record<string, unknown>[];
    }>;
}
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