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create react context that has a validated consumer.
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// create a React context Provider/Consumer pair that | |
// validates the consumer is rendered within a provider | |
function createRequiredContext(name) { | |
const Context = React.createContext() | |
function Consumer(props) { | |
return ( | |
<Context.Consumer {...props}> | |
{val => { | |
if (!val) { | |
throw new Error( | |
`The ${name}Consumer must be rendered ` + | |
`within a ${name}Provider and it was not` | |
) | |
} | |
return props.children(val) | |
}} | |
</Context.Consumer> | |
) | |
} | |
return { Provider: Context.Provider, Consumer } | |
} | |
// const LanguageContext = createRequiredContext('Language') | |
// ReactDOM.render(<LanguageContext.Consumer />, rootEl) | |
// ERROR: The LanguageConsumer must be rendered within a | |
// LanguageProvider and it was not | |
// | |
// @kentcdodds <3 |
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