Function reduceCallback

packages/db/src/proxy.ts:129–138

(
        this: unknown,
        accumulator: unknown,
        element: unknown,
        index: number,
        array: unknown,
      )

    // For reduce/reduceRight, the callback signature is different
    if (methodName === `reduce` || methodName === `reduceRight`) {
      const reduceCallback = function (
        this: unknown,
        accumulator: unknown,
        element: unknown,
        index: number,
        array: unknown,
      ) {
        const proxiedElement = getProxiedElement(element, index)
        return callback.call(this, accumulator, proxiedElement, index, array)
      }
      return methodFn.apply(changeTracker.copy_, [
        reduceCallback,
        ...args.slice(1),