/**
 * Applies an accumulator function over a sequence.
 * @typeparam TSource The type of the elements of source.
 * @param src An Enumerable<TSource> to aggregate over.
 * @param aggregator An accumulator function to be invoked on each element.
 * @returns The final accumulator value.
 */
export declare function aggregate<TSource>(src: Iterable<TSource>, aggregator: (prev: TSource, curr: TSource, index: number) => TSource): TSource;
/**
 * Applies an accumulator function over a sequence. The specified seed value is used as the initial accumulator value.
 * @typeparam TSource The type of the elements of source.
 * @typeparam TAccumulate The type of the accumulator value.
 * @param src An Enumerable<TSource> to aggregate over.
 * @param aggregator An accumulator function to be invoked on each element.
 * @param seed The initial accumulator value.
 * @returns The final accumulator value.
 */
export declare function aggregate<TSource, TAccumulate>(src: Iterable<TSource>, seed: TAccumulate, aggregator: (prev: TAccumulate, curr: TSource, index: number) => TAccumulate): TAccumulate;
/**
 * Applies an accumulator function over a sequence.
 * The specified seed value is used as the initial accumulator value, and the specified function is used to select the result value.
 * @typeparam TSource The type of the elements of source.
 * @typeparam TAccumulate The type of the accumulator value.
 * @typeparam TResult The type of the resulting value.
 * @param src An Enumerable<TSource> to aggregate over.
 * @param aggregator An accumulator function to be invoked on each element.
 * @param seed The initial accumulator value.
 * @param resultSelector An accumulator function to be invoked on each element.
 * @returns The final accumulator value.
 */
export declare function aggregate<TSource, TAccumulate, TResult>(src: Iterable<TSource>, seed: TAccumulate, aggregator: (prev: TAccumulate, curr: TSource, index: number) => TAccumulate, resultSelector: (accumulated: TAccumulate) => TResult): TResult;
/**
 * Applies an accumulator function over a sequence.
 * The specified seed value is used as the initial accumulator value, and the specified function is used to select the result value.
 * @typeparam TSource The type of the elements of source.
 * @typeparam TAccumulate The type of the accumulator value.
 * @typeparam TResult The type of the resulting value.
 * @param src An Enumerable<TSource> to aggregate over.
 * @param aggregator An accumulator function to be invoked on each element.
 * @param seed The initial accumulator value.
 * @param resultSelector An accumulator function to be invoked on each element.
 * @returns The final accumulator value.
 */
export declare function aggregate<TSource, TAccumulate, TResult>(src: Iterable<TSource>, seedOrAggregator: (TAccumulate | TSource) | ((prev: TAccumulate | TSource, curr: TSource, index: number) => TAccumulate | TSource), aggregator?: (prev: TAccumulate | TSource, curr: TSource, index: number) => TAccumulate | TSource, resultSelector?: (accumulated: TAccumulate) => TResult): TAccumulate | TSource | TResult;
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