algo.ts

const signals = gainers.reduce(
    (
      acc: Array<{
        ticker: string;
        news: Array<NewsResult>;
        bias: string;
      }>,
      curr
    ) => {
      const openingBar = curr.bars.find((bar) => bar.t === openingBarTime);
      const isSignal =
        openingBar &&
        openingBar.ema9 &&
        openingBar.c > openingBar.ema9 &&
        openingBar.v > 500000;

      return isSignal
        ? [
            ...acc,
            {
              ticker: curr.ticker,
              news: curr.news,
              bias: openingBar.c >= openingBar.o ? "long" : "short",
            },
          ]
        : acc;
    },
    []
  );