invert all colors on a web page

css-color-invert.js

// invert all colors on the page
export default function invert() {
  let css = 'html {-webkit-filter: invert(100%);' +
    '-moz-filter: invert(100%);' + 
    '-o-filter: invert(100%);' + 
    '-ms-filter: invert(100%); }',
    head = document.getElementsByTagName('head')[0],
    style = document.createElement('style')

  if (!window.counter) {
    window.counter = 1
  } else {
    window.counter++
    if (window.counter % 2 == 0) {
      css ='html {-webkit-filter: invert(0%); -moz-filter: invert(0%); -o-filter: invert(0%); -ms-filter: invert(0%); }'
    }
  }

  style.type = 'text/css'
  if (style.styleSheet) {
    style.styleSheet.cssText = css
  } else {
    style.appendChild(document.createTextNode(css))
  }
  head.appendChild(style)
}

what module do i need to run this shit

@ATLAS-IND-Software I'm not sure what you mean, can you elaborate? This isn't published as an official module anywhere, it's just a gist I was using to experiment with inverting all colors on a website. It does work though.

confirmed does work, removed 'export default' and added 'invert()'
cheers