code: function process (svg, { prefix }) {
    // Inject a <style> in the SVG document to allow changing colors
    svg = svg.replace(/<(path|circle) /gi, (_, tag) => `<${tag} fill="__COLOR__" `)
  
    // Since this is a data: URI, we want to encode it with %23 and such
    svg = encodeURIComponent(svg)
  
    // We want the #{...} interpolation to be outside the URI encoding
    svg = svg.replace(/__COLOR__/g, '#{' + prefix + '-fix-color($color)}')
  
    svg = 'data:image/svg+xml;charset=utf-8,' + svg
  
    return svg
  }
docs: Converts the SVG into a data URI.
  @private