René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"Document method to call on refs","articleBody":"Bringing this over from Discord as requested by @MoOx. I'm basically not sure if this is the right way to use refs and if the external I've defined in the following example should be exposed in the repo:\r\n\r\n```reason\r\nopen ReactNative;\r\nopen ReactNavigation;\r\n\r\n// TODO: add to TextInput?\r\nexternal elementToObj: TextInput.element =\u003e Js.t({..}) = \"%identity\";\r\n\r\n[@react.component]\r\nlet make = (~navigation: Navigation.t) =\u003e {\r\n  open Navigation;\r\n  let (text, onChangeText) = React.useState(() =\u003e \"Home\");\r\n  let ref = React.useRef(Js.Nullable.null);\r\n\r\n  React.useEffect0(() =\u003e {\r\n    let intervalId =\r\n      Js.Global.setTimeout(\r\n        () =\u003e\r\n          switch (ref-\u003eReact.Ref.current-\u003eJs.Nullable.toOption) {\r\n          | Some(_ref) =\u003e _ref-\u003eelementToObj##focus()\r\n          | None =\u003e ()\r\n          },\r\n        5000,\r\n      );\r\n    Some(() =\u003e Js.Global.clearTimeout(intervalId));\r\n  });\r\n\r\n  \u003c\u003e\r\n    \u003cTouchableOpacity\r\n      onPress={_ =\u003e navigation-\u003eNavigation.navigate(\"PrivacyPolicy\")}\u003e\r\n      \u003cText\u003e {React.string(text)} \u003c/Text\u003e\r\n    \u003c/TouchableOpacity\u003e\r\n    \u003cTextInput ref onChangeText={text =\u003e onChangeText(_ =\u003e text)} /\u003e\r\n  \u003c/\u003e;\r\n};\r\n```","author":{"url":"https://github.com/cem2ran","@type":"Person","name":"cem2ran"},"datePublished":"2019-04-20T09:00:22.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":3},"url":"https://github.com/419/rescript-react-native/issues/419"}