let shim = {}; shim.isNode = () => { if (typeof process === 'undefined') return false; return process.title = 'node'; }; shim.isReactNative = () => { return !shim.isNode(); }; shim.fetch = typeof fetch !== 'undefined' ? fetch : null; shim.FormData = typeof FormData !== 'undefined' ? FormData : null; if (!shim.fetch) { let moduleName = 'node-fetch'; shim.fetch = require(moduleName); } if (!shim.FormData) { let moduleName = 'form-data'; shim.FormData = require(moduleName); } export { shim };