polished/lib/helpers/getValueAndUnit.js

A lightweight toolset for writing styles in Javascript.

"use strict";

exports.__esModule = true;
exports["default"] = getValueAndUnit;
var cssRegex = /^([+-]?(?:\d+|\d*\.\d+))([a-z]*|%)$/;

/**
 * Returns a given CSS value and its unit as elements of an array.
 *
 * @example
 * // Styles as object usage
 * const styles = {
 *   '--dimension': getValueAndUnit('100px')[0],
 *   '--unit': getValueAndUnit('100px')[1],
 * }
 *
 * // styled-components usage
 * const div = styled.div`
 *   --dimension: ${getValueAndUnit('100px')[0]};
 *   --unit: ${getValueAndUnit('100px')[1]};
 * `
 *
 * // CSS in JS Output
 *
 * element {
 *   '--dimension': 100,
 *   '--unit': 'px',
 * }
 */
function getValueAndUnit(value) {
  if (typeof value !== 'string') return [value, ''];
  var matchedValue = value.match(cssRegex);
  if (matchedValue) return [parseFloat(value), matchedValue[2]];
  return [value, undefined];
}
module.exports = exports.default;