react native make accessToken global - react-native

Question

im using rn-secure-storage to save authState when using oauth2, then i have class AppHelper to control all network function like below:
import RNSecureStorage, { ACCESSIBLE } from 'rn-secure-storage'
export const accessToken = async() => {
await RNSecureStorage.get("authState").then((value) => {
console.log("authState", value);
return JSON.parse(value).accessToken
}).catch((err) => {
console.log("can not get authState", err);
});
};
export const getData = (url, tag = 'getData') => {
return fetch(url, {
method : 'GET',
headers: {
'Content-Type': 'application/json;charset=utf-8',
'Authorization' : 'Bearer ' + accessToken
}
})
.then((response) => {
console.log(tag, 'Bearer ' + accessToken);
return response.text();
})
.then((json) => {
console.log(tag, json)
return json;
})
.catch((error) => {
handleError(err)
console.log(tag, error, url)
});
}
export const handleError = (error) => {
if (error.response.code == 401){
alert('Unauthorized')
}else{
console.log('network call failed', error)
}
}
im coding native before, so im not familiar with React native syntax. I just want to get access token to apply in network call, but my code show error:
_getMasterInfoApi Bearer function _callee() {
return _regenerator.default.async(function _callee$(_context) {
while (1) {
switch (_context.prev = _context.next) {
case 0:
_context.next = 2;
return _regenerator.default.awrap(_rnSecureStorage.default.get("authState").then(function (value) {
console.log("authState", value);
return JSON.parse(value).accessToken;
}).catch(function (err) {
handleError(err);
}));
case 2:
case "end":
return _context.stop();
}
}
}, null, null, null, Promise);
}
Can anyone help? thanks in advance