sprinklers3/client/pages/DevicesPage.tsx

import { observer } from "mobx-react";
import * as React from "react";
import { Item } from "semantic-ui-react";

import { DeviceView } from "@client/components";
import { AppState, injectState } from "@client/state";

class DevicesPage extends React.Component<{ appState: AppState }> {
    render() {
        const { appState } = this.props;
        const { userData } = appState.userStore;
        let deviceNodes: React.ReactNode;
        if (!userData) {
            deviceNodes = <span>Not logged in</span>;
        } else if (!userData.devices || !userData.devices.length) {
            deviceNodes = <span>You have no devices</span>;
        } else {
            deviceNodes = userData.devices.map((device) => (
                <DeviceView key={device.id} deviceId={device.id} inList />
            ));
        }
        return (
            <React.Fragment>
                <h1>Devices</h1>
                <Item.Group>
                    {deviceNodes}
                </Item.Group>
            </React.Fragment>
        );
    }
}

export default injectState(observer(DevicesPage));