$3

const systemFonts = new SystemFonts();

// asynchronous
systemFonts.getFonts().then(
(res) => {
// res is an array of font family strings
// do something with the response
},
(err) => // handle the error
);

// synchronous
const fontList = systemFonts.getFontsSync();

var systemFonts = new SystemFonts();

// asynchronous
systemFonts.getFonts().then(
function(res) {
// do something with the response
},
function(err) {
// handle the error
}
);

// synchronous
var fontList = systemFonts.getFontsSync();

$3