BackpackTester.jsx

import React                from 'react'
import { withDependencies } from '../utils/env-utils'
import { isInBackpack }     from '../utils/backpack-utils-utils'

const BackpackTester = ({ thing }, { _ }) => (
    const isThingInBackpack = _.isInBackpack(thing)

    return (
        <div>
            Is thing in backpack? { isThingInBackpack }
        </div>
    )
)

BackpackTester.propTypes = {
    thing: React.PropTypes.object,
}

BackpackTester.contextTypes = {
    _: React.PropTypes.object, // dependencies
}

export default withDependencies(BackpackTester, [isInBackpack])