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export function remToPx(value: string, rootSize: number = 16): string | undefined {
  if (/^-?[0-9.]+rem$/.test(value)) {
    let number = parseFloat(value.substr(0, value.length - 3))
    if (!isNaN(number)) {
      return `${number * rootSize}px`
    }
  }
  return undefined
}