Mudar fonte padrão de um projeto React-native

gistfile1.txt

import { Text } from 'react-native'

let oldText = Text.render;
Text.render = function (...args) {
    let origin = oldText.call(this, ...args);
    return React.cloneElement(origin, {
        style: [{fontFamily: 'Open Sans'}, origin.props.style]
    });
};