Get Figma Node ID from URL

figma_gist.js

export function getNodeIdFromUrl(url: string): string | null {
  url = url.toLowerCase()
  let startIndex: number = url.indexOf('node-id=') + 8
  let endIndex: number = url.indexOf('&', startIndex)
  if (startIndex) {
    if (endIndex > 0) {
      return url.substring(startIndex, endIndex).replace('%3a', ':')
    } else {
      return url.substring(startIndex).replace('%3a', ':')
    }
  } else {
    return null
  }
}