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// @flow
function constructGradientValue(literals: Array<string>, ...substitutions: Array<string>): string {
let template = ''
for (let i = 0; i < literals.length; i += 1) {
template += literals[i]
if (i === substitutions.length - 1 && substitutions[i]) {
const definedValues = substitutions.filter(substitute => !!substitute)
// Adds leading coma if properties preceed color-stops
if (definedValues.length > 1) {
template = template.slice(0, -1)
template += `, ${substitutions[i]}`
// No trailing space if color-stops is the only param provided
} else if (definedValues.length === 1) {
template += `${substitutions[i]}`
}
} else if (substitutions[i]) {
template += `${substitutions[i]} `
}
}
return template.trim()
}
export default constructGradientValue