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Legacy browser support

Reactive Data Client is designed to work out of the box with most tooling.

If you see, Uncaught TypeError: Class constructor Resource cannot be invoked without 'new' this is most likely due to targeting Internet Explorer support with a custom webpack configuration. This will occur even when using a modern browser, so long as your target (typically set with browserslist) includes legacy browsers like Internet Explorer.

In this case, follow the instructions below to ensure compatibility.

Transpile packages

Adding webpack-plugin-modern-npm will ensure compatibility of all installed packages with legacy browsers.

npm install --saveDev  webpack-plugin-modern-npm

Then install the plugin by adding to webpack config.

const ModernNpmPlugin = require('webpack-plugin-modern-npm');

module.exports = {
plugins: [
new ModernNpmPlugin()


Use CRA polyfill or follow instructions below.

npm install --save core-js whatwg-fetch
import 'core-js/stable';
import 'whatwg-fetch';
// place the above line at top