stock-vsa-analyzer/src/indicators/vsa.js

// This file contains functions that implement Volume Spread Analysis (VSA) techniques. 
// It analyzes price and volume data to identify potential breakouts and market trends.

export function analyzeVSA(priceData, volumeData) {
    const results = [];
    
    for (let i = 1; i < priceData.length; i++) {
        const currentPrice = priceData[i];
        const previousPrice = priceData[i - 1];
        const currentVolume = volumeData[i];
        const previousVolume = volumeData[i - 1];

        const priceChange = currentPrice - previousPrice;
        const volumeChange = currentVolume - previousVolume;

        const vsaSignal = determineVsaSignal(priceChange, volumeChange);
        results.push({
            price: currentPrice,
            volume: currentVolume,
            vsaSignal: vsaSignal
        });
    }

    return results;
}

function determineVsaSignal(priceChange, volumeChange) {
    if (priceChange > 0 && volumeChange > 0) {
        return 'Bullish';
    } else if (priceChange < 0 && volumeChange > 0) {
        return 'Bearish';
    } else if (priceChange > 0 && volumeChange < 0) {
        return 'Weak Bullish';
    } else if (priceChange < 0 && volumeChange < 0) {
        return 'Weak Bearish';
    } else {
        return 'Neutral';
    }
}

export function detectBreakouts(priceData, volumeData, threshold) {
    const breakouts = [];

    for (let i = 1; i < priceData.length; i++) {
        const currentPrice = priceData[i];
        const previousPrice = priceData[i - 1];
        const currentVolume = volumeData[i];

        if (currentPrice > previousPrice + threshold && currentVolume > volumeData[i - 1]) {
            breakouts.push({
                price: currentPrice,
                volume: currentVolume,
                breakout: true
            });
        }
    }

    return breakouts;
}