| 1 | export default function(hexColor, lightness) {
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| 2 | let hex = String(hexColor).replace(/[^0-9a-f]/gi, '');
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| 3 | if (hex.length < 6) {
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| 4 | hex = hex.replace(/(.)/g, '$1$1');
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| 5 | }
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| 6 | let lum = lightness || 0;
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| 7 |
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| 8 | let rgb = '#';
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| 9 | let c;
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| 10 | for (let i = 0; i < 3; ++i) {
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| 11 | c = parseInt(hex.substr(i * 2, 2), 16);
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| 12 | c = Math.round(Math.min(Math.max(0, c + c * lum), 255)).toString(16);
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| 13 | rgb += ('00' + c).substr(c.length);
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| 14 | }
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| 15 | return rgb;
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| 16 | }
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