why use react code example

Example 1: why to use event.persist

//Without event.persist() , 
//React will make the first event value as null when second event is fired.

//How to use?

const handleFilterChange = (event) => {
    event.persist();
    setFilters(currentFilters => (
      produce(currentFilters, draftFilter => {
        draftFilter[event.target.name] = event.target.value;
      })
    ))
  };

Example 2: why use typescript with react

npm install --save typescript @types/node @types/react @types/react-dom @types/jest