All files addtopage.js

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// Tie element types to a test using the file name
const elementTypeTest = [
  {
    element: 'image',
    test: (filename) => /\.(gif|jp[e]?g|png|svg)$/.test(filename)
  },
  {
    element: 'script',
    test: (filename) => /js[x]?$/.test(filename)
  },
  {
    element: 'style',
    test: (filename) => /css$/.test(filename)
  }
]
 
// All element types we know
const knownElementTypes = [
  'iframe',
  'image',
  'link',
  'script',
  'style'
]
 
function addtopage(resource, { inline = false, type = undefined } = {}) {
  // If not given a type, try to infer it from the file name (esp. the file extension)
  if (!type) {
    const testType = elementTypeTest.find(elementType => elementType.test(resource))
 
    Iif (!testType) {
      throw new Error(`Cannot guess element needed for unknown file type: ${resource}`)
    }
 
    type = testType.element
  }
 
  // Correct style and link tags when necessary
  if (!inline && type === 'style') {
    type = 'link'
  } else Iif (inline && type === 'link') {
    type = 'style'
  }
 
  // Ensure we are only working with an element we know
  Iif (!knownElementTypes.includes(type)) {
    throw new Error(`Cannot create element of unknown type: ${type}`)
  }
 
  // Create the element
  var newElement = document.createElement(type)
 
  if (!inline && type !== 'link') {
    newElement.src = resource
  } else Eif (type === 'link') {
    newElement.href = resource
    newElement.rel = 'stylesheet'
  } else {
    // TODO: write logic for inlining resource contents
    throw new Error('Creating inline resources is not yet implemented')
  }
 
  return document.body.appendChild(newElement)
}
 
export default addtopage