react-financial-charts/lib/calculator/heikinAshi.js

React charts specific to finance.

import { identity, mappedSlidingWindow } from "../utils";
export default function () {
    let source = identity;
    const calculator = (data) => {
        const algorithm = mappedSlidingWindow()
            .windowSize(2)
            // @ts-ignore
            .undefinedValue(({ open, high, low, close }) => {
            close = (open + high + low + close) / 4;
            return { open, high, low, close };
        })
            .accumulator(([prev, now]) => {
            const { date, volume } = now;
            const close = (now.open + now.high + now.low + now.close) / 4;
            const open = (prev.open + prev.close) / 2;
            const high = Math.max(open, now.high, close);
            const low = Math.min(open, now.low, close);
            return { date, open, high, low, close, volume };
        });
        return algorithm(data);
    };
    calculator.source = (newSource) => {
        if (newSource === undefined) {
            return source;
        }
        source = newSource;
        return calculator;
    };
    return calculator;
}
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