`theme ? 'dark' : 'light'` will always use the dark theme no matter what it's set to in context. Guessing this is not what was intended? This PR fixes it.
* Update Ref API in docs
Update to new React.createRef() API in guide "Uncontrolled Components".
* Update Ref API in doc example
Use new Ref API in guide's example.
* Fix syntax error in example
* Update highlighting ranges in docs
After updating to the new createRef API, the highlighting ranges in Uncontrolled Components were wrong.
* Update highlighting ranges in docs example
After updating to the new createRef API, the highlighting ranges in Uncontrolled Components were wrong.
* Update highlighting ranges in docs example
Remove empty line in source code.
* Update uncontrolled-components.md
* Update input-type-file.js
* Add 'visual components' use case for forwarding refs
* Rearrange "forwarding refs" to focus on simple use case
* Minor wording nits to 2018-03-29-react-v-16-3.md
* Minor wording nits to forwarding-refs.md
* Add more info to the forwardRef reference doc
* Minor wording nits to reference-react.md
* Added an example showing how to update the context from inside a (deeply) nested component
* Wrap comments
* Wrap comments
* Tweak wording
* Prettier
* Prettier
* Typo: "funtion" -> "function"
* Minor: context/theme-detailed-app.js broken
Today I tested out the new Context API using using [CRA](https://github.com/facebook/create-react-app).
I encountered a runtime exception, so this tiny PR is intended to make it easier for future Context API learners.
`ReferenceError: Must call super constructor in derived class before accessing 'this' or returning from derived constructor`
create-react-app@next commit da518d2238298dd5db74e9c63c12251099f87bb0
* Update theme-detailed-app.js
When a new `id` prop is passed in, `getDerivedStateFromProps` sets `this.state.externalData` to `null`. If I understand the new API correctly the return value of gDSFP() either becomes the new state or is merged into the new state? If so, then `componentDidUpdate` should examine the new state (`this.state.externalData`), not `prevState.externalData`.
* Use correct component name in context doc example
I'm assuming the intention was to reference the `FancyButton` component defined directly above, unless I'm misunderstanding how to read this example.
* Prettier
