/**
 * @see https://github.com/Microsoft/TypeScript/issues/12215#issuecomment-377567046
 */
import { isObjPure } from 'exotic'
import { AnyObj, Without } from './typings'

/**
 * Returns a new object with the key/value pairs from `obj`
 * that are not in the array `omitKeys`.
 */
export const omit = <Obj = AnyObj, List = string[]>(
  obj: Obj,
  omitKeys: List
): Without<Obj, List> => {
  const result = {}

  // @todo should work on sets?
  const keys = isObjPure(omitKeys) ? Object.keys(omitKeys) : omitKeys

  Object.keys(obj).forEach(key => {
    if ((keys as any[]).includes(key) === false) {
      result[key] = obj[key]
    }
  })

  return result as any
}