Is not stitching and comma at the end of the javascript operation standard for ES6?

Question

I see people programming this way:

import React, { Component } from 'react';

and

import React, { Component } from 'react'

not putting the comma at the end is standard of the same Es6? I found another question here in the community but the answers does not say it is a standard of Ecma. I saw programmers saying that it is the standard of Es6 and that’s why I came up with the question. I couldn’t find a document with this statement.