/**
 * Measures the execution time of two functions and returns the result based on the experiment configuration.
 * This is used to compare the execution of AggregatingMergeTrees with the existing ReplacingMergeTree execution.
 */
export declare const measureAndReturn: <T, Y>(args: {
    operationName: string;
    projectId: string;
    input: T;
    existingExecution: (input: T) => Promise<Y>;
    newExecution: (input: T) => Promise<Y>;
    minStartTime?: Date;
}) => Promise<Y>;
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