vjau

type NullToOptional<K> = {
    [key in keyof K as null extends K[key] ? key : never]?: Exclude<K[key], null>
  } & {
    [key in keyof K as null extends K[key] ? never: key]: K[key]
  }

 type OptionalToNullable<T> = {
  [K in keyof T as undefined extends T[K] ? K : never]-?: T[K] | null; // Convert optional properties to mandatory nullable
} & {
  [K in keyof T as undefined extends T[K] ? never : K]: T[K]; // Keep non-optional properties unchanged

vjau

type _Intersect = {a?:number} & {a:number|undefined};

//state of exactOptionalPropertyTypes
type IsExactOptional = _Intersect["a"] extends Exclude<_Intersect["a"], undefined> ? true : false;

vjau

module.exports = {
  "we go on the page": function(browser){
    browser
    .url("http://localhost:3000")
    .waitForElementVisible("#stuff", 10000)
    .assert.title("MyPage")
  },
  "we fake the Date": function(browser){
    browser
    .fakeDate(new Date(2001, 1, 1).getTime()) //DONE !