score:1

Accepted answer
const AppWrapper = React.createClass({
    mixins: [ReactMeteor.Mixin],

    getMeteorState () {
        return {
            data: Immutable.Map({
                userId: Meteor.userId()
            })
        };
    },

    shouldComponentUpdate (nextProps, nextState) {
        return !this.state.data.equals(nextState.data);
    },

    render () {
        return (
            <App data={this.state.data} />
        );
    }
});

// This is basic example with pure component.
// Of course this might be another component created with 
// React.createClass implementing it's own shouldComponentUpdate method.
const App = ({ data }) => (
    <p>Your userId: {data.get('userId')}</p>
);

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