code: function hasVariableResources (assetsDirectory) {
    const files = require('fs-extra').readdirSync(assetsDirectory)
    const hasScale = files.find(file => /\.scale-...\./g.test(file))
  
    return (!!hasScale)
  }
docs: Makes an educated guess whether or not resources have
  multiple variations or resource versions for
  language, scale, contrast, etc
  
  @param assetsDirectory - Path to a the assets directory
  @returns {boolean} - Are the assets variable?