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57 lines
1.6 KiB
57 lines
1.6 KiB
// @flow
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import constructGradientValue from '../internalHelpers/_constructGradientValue'
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import PolishedError from '../internalHelpers/_errors'
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import type { LinearGradientConfiguration } from '../types/linearGradientConfiguration'
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import type { Styles } from '../types/style'
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/**
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* CSS for declaring a linear gradient, including a fallback background-color. The fallback is either the first color-stop or an explicitly passed fallback color.
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*
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* @example
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* // Styles as object usage
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* const styles = {
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* ...linearGradient({
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colorStops: ['#00FFFF 0%', 'rgba(0, 0, 255, 0) 50%', '#0000FF 95%'],
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toDirection: 'to top right',
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fallback: '#FFF',
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})
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* }
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*
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* // styled-components usage
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* const div = styled.div`
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* ${linearGradient({
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colorStops: ['#00FFFF 0%', 'rgba(0, 0, 255, 0) 50%', '#0000FF 95%'],
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toDirection: 'to top right',
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fallback: '#FFF',
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})}
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*`
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*
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* // CSS as JS Output
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*
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* div: {
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* 'backgroundColor': '#FFF',
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* 'backgroundImage': 'linear-gradient(to top right, #00FFFF 0%, rgba(0, 0, 255, 0) 50%, #0000FF 95%)',
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* }
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*/
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export default function linearGradient({
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colorStops,
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fallback,
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toDirection = '',
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}: LinearGradientConfiguration): Styles {
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if (!colorStops || colorStops.length < 2) {
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throw new PolishedError(56)
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}
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return {
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backgroundColor:
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fallback
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|| colorStops[0]
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.replace(/,\s+/g, ',')
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.split(' ')[0]
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.replace(/,(?=\S)/g, ', '),
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backgroundImage: constructGradientValue`linear-gradient(${toDirection}${colorStops
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.join(', ')
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.replace(/,(?=\S)/g, ', ')})`,
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}
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}
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