Function typeIs

packages/type-is/src/index.ts:71–91

(value: string, ...types: string[])

 * or a mime type.
 */
export const typeIs = (value: string, ...types: string[]) => {
  let i: number
  // remove parameters and normalize
  const val = tryNormalizeType(value)

  // no type or invalid
  if (!val) return false

  // no types, return the content type
  if (!types || !types.length) return val

  let type: string
  for (i = 0; i < types.length; i++) {
    if (mimeMatch(normalize((type = types[i])), val)) {
      return type[0] === '+' || type.indexOf('*') !== -1 ? val : type
    }
  }

  // no matches
  return false
}