const LOCALE_STORAGE_LIST_KEY = 'task.lists'
const LOCALE_STORAGE_SELECTED_LIST_ID_KEY = 'task.selectedListId'
let lists = JSON.parse(localStorage.getItem(LOCALE_STORAGE_LIST_KEY)) || []
let selectedListId = localStorage.getItem(LOCALE_STORAGE_SELECTED_LIST_ID_KEY)

console.log(selectedListId);           null script.js:19:9
console.log(selectedListId == null);   false script.js:20:9
console.log(null == null);             true script.js:21:9
console.log(typeof selectedListId);    string script.js:22:9
console.log(typeof null);              object script.js:23:9

I need to compare selectedListId with null and get true in if statement!