Initializing Text.defaultProps with Typescript

I just started rewriting my existing react-native project from js to typescript.To disable font scaling, I set Text.defaultProps.allowFontScaling to false at the beginning of App.js and it worked well.

import React from 'react';import { Text } from 'react-native';...if (Text.defaultProps == null) Text.defaultProps = {};Text.defaultProps.allowFontScaling=false; export default function App () {  . . .}

When I changed from App.js to App.tsx and ran tsc, I get following typescript error:

App.tsx:16:10 - error TS2339: Property 'defaultProps' does not exist on type 'typeof Text'.16 if (Text.defaultProps == null) Text.defaultProps = {};

I tried to search similar issues and typescript documents but failed. How can I solve this error?