rsnext/examples/with-unstated/containers/ClockContainer.js

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import { Container } from 'unstated'
export default class ClockContainer extends Container {
state = {
lastUpdate: 0,
light: false
}
constructor () {
super()
this.interval = setInterval(() => {
this.setState((state) => ({ light: !state.light, lastUpdate: Date.now() }))
}, 1000)
}
}