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cell0.js

import palette from 'palette';
import loadImage from 'blueimp-load-image';

const imageUrl = 'https://i.ytimg.com/vi/tntOCGkgt98/maxresdefault.jpg';

function getColors (file) {
    return new Promise ((resolve) => {
        loadImage(file, canvas => {
            const colors = palette(canvas, 6);
            resolve(colors[0]);
        }, { canvas: true, maxWidth: 1000 });
    });
}

getColors(imageUrl).then(colors => colors);