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Added Chroma.js workaround for it not yet supporting 'deg' units: #18

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Added Chroma.js workaround for it not yet supporting 'deg' units: #18

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7 changes: 6 additions & 1 deletion lib/colorStops.js
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Original file line number Diff line number Diff line change
Expand Up @@ -15,7 +15,12 @@ module.exports = (colors, coordinates, alphaDecimals = 5, colorMode = 'lrgb') =>
coordinates.forEach(coordinate => {
const ammount = coordinate.y
const percent = coordinate.x * 100
let color = chroma.mix(colors[0], colors[1], ammount, colorMode).css('hsl')
let color = chroma.mix(
helpers.chromaDegreesWorkaround(colors[0]),
helpers.chromaDegreesWorkaround(colors[1]),
ammount,
colorMode
).css('hsl')
color = helpers.roundHslAlpha(color, alphaDecimals)
if (Number(coordinate.x) !== 0 && Number(coordinate.x) !== 1) {
colorStops.push(`${color} ${+percent.toFixed(2)}%`)
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22 changes: 22 additions & 0 deletions lib/helpers.js
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,28 @@ exports.roundHslAlpha = (color, alphaDecimals) => {
return color
}

/**
* Chroma.js 'deg' unit workaround.
*
* Chroma.js doesn't yet support hsl()/hsla() colors that have the 'deg' unit,
* so this strips the unit out to prevent Chroma.js throwing an error. If no
* unit is specified for the hue value, the CSS spec says that it must be
* interpreted as degrees for backward compatibility.
*
* @param {String} color A CSS color value.
*
* @return {String} The color parameter with any 'deg' unit stripped from the
* hue.
*
* @see https://github.com/gka/chroma.js/issues/297
* Open Chroma.js issue regarding the newer color formats.
*
* @see https://developer.mozilla.org/en-US/docs/Web/CSS/color_value/hsl
*/
exports.chromaDegreesWorkaround = (color) => {
return color.replaceAll(/(hsla?\(\s*\d+)deg([,\s].+)$/gm, '$1$2');
}

/**
* Wrap a string telling the user we couldn't parse it
* @param {String} input A string
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