Generic Fetch option

fetch.js

import {
    getAuthToken
} from './token.js';
export const fetchOpts = (method, body = null) => {
    return Object.assign({}, {
        method,
        headers: {
            'Accept': 'application/json',
            'Content-Type': 'application/json',
            'Authorization': `Bearer ${getAuthToken()}`
        }
    }, body ? {
        body: JSON.stringify(body)
    } : {});
}