change default import into named import

[xiaoxiangmoe]

Consistent with the code below:

create-react-app/packages/react-scripts/template-typescript/src/App.tsx

Line 1 in dc133a3

import * as React from 'react';

[Timer]

import * as React from 'react'; seems to be an accident, all this code should read import React from 'react';.

Thanks for the PR, can you update the other file?

[xiaoxiangmoe]

@Timer In TypeScript Doc it write:

import * as React from "react";

Should we use named export rather than default export?

Named export seems to be a more accurate way of expressing the export of react.

I'll open another pull request to change named import into default import.