Function _aggregate

_aggregate<T, TOut>(
    src: Iterable<T>,
    seed: TOut,
    aggFunc: (prev: TOut, curr: T, idx: number) => TOut,
): TOut
Aggregates all elements from the source iterable into a single value using the provided accumulator.
Type Parameters
- T
  Element type produced by the source iterable.
- TOut
  Accumulator result type yielded after processing the entire sequence.
Parameters
- src: Iterable<T>
  Source iterable whose elements will feed into the accumulator function.
- seed: TOut
  Initial accumulator value supplied to the first call of aggFunc.
- aggFunc: (prev: TOut, curr: T, idx: number) => TOut
  Combiner invoked with the previous accumulator, current element, and current index.
Returns TOut
The final accumulator value after iterating through the entire source.
Example
```
const total = _aggregate([1, 2, 3], 0, (acc, n) => acc + n);
console.log(total); // 6
```
or using the curried version:
```
const total = pipeInto(
  [1, 2, 3],
  aggregate(0, (acc, n) => acc + n)
);
console.log(total); // 6
```
- Defined in src/transformers/aggregate.ts:28