From 2d85c61ba8651e447960c6987c3fbfc1031af4b6 Mon Sep 17 00:00:00 2001
From: streamich <streamich@gmail.com>
Date: Mon, 29 Oct 2018 22:45:09 +0100
Subject: [PATCH] =?UTF-8?q?feat:=20=F0=9F=8E=B8=20add=20useRenderProp=20ho?=
 =?UTF-8?q?ok?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 README.md                               |  1 +
 docs/useRenderProp.md                   | 31 +++++++++++++++++++++++++
 src/__stories__/useRenderProp.story.tsx | 31 +++++++++++++++++++++++++
 src/index.ts                            |  2 ++
 src/useRenderProp.ts                    | 29 +++++++++++++++++++++++
 5 files changed, 94 insertions(+)
 create mode 100644 docs/useRenderProp.md
 create mode 100644 src/__stories__/useRenderProp.story.tsx
 create mode 100644 src/useRenderProp.ts

diff --git a/README.md b/README.md
index 8f5af6c5..2346e1a4 100644
--- a/README.md
+++ b/README.md
@@ -81,6 +81,7 @@
   - [`useGetSet`](./docs/useGetSet.md) &mdash; returns state getter `get()` instead of raw state.
   - [`useGetSetState`](./docs/useGetSetState.md) &mdash; as if [`useGetSet`](./docs/useGetSet.md) and [`useSetState`](./docs/useSetState.md) had a baby.
   - [`useObservable`](./docs/useObservable.md) &mdash; tracks latest value of an `Observable`.
+  - [`useRenderProp`](./docs/useRenderProp.md) &mdash; extracts value from a render-prop or a FaCC.
   - [`useSetState`](./docs/useSetState.md) &mdash; creates `setState` method which works like `this.setState`. [![][img-demo]](https://codesandbox.io/s/n75zqn1xp0)
   - [`useToggle` and `useBoolean`](./docs/useToggle.md) &mdash; tracks state of a boolean.
   - [`useCounter` and `useNumber`](./docs/useCounter.md) &mdash; tracks state of a number.
diff --git a/docs/useRenderProp.md b/docs/useRenderProp.md
new file mode 100644
index 00000000..0555d81a
--- /dev/null
+++ b/docs/useRenderProp.md
@@ -0,0 +1,31 @@
+# `useRenderProp`
+
+Extracts a value from render-prop or FaCC component.
+
+
+## Usage
+
+```jsx
+import {useRenderProp} from 'react-use';
+
+const FaCC = ({children}) => {
+  return children('VALUE-FaCC');
+};
+const RenderProp = ({render}) => {
+  return render('VALUE-RenderProp');
+};
+
+const Demo = () => {
+  const [fragment1, [value1]] = useRenderProp(<FaCC />);
+  const [fragment2, [value2]] = useRenderProp(<RenderProp />);
+
+  return (
+    <>
+      {fragment1}
+      {fragment2}
+      <div>FaCC: {value1}</div>
+      <div>Render prop: {value2}</div>
+    </>
+  );
+};
+```
diff --git a/src/__stories__/useRenderProp.story.tsx b/src/__stories__/useRenderProp.story.tsx
new file mode 100644
index 00000000..23dca3b4
--- /dev/null
+++ b/src/__stories__/useRenderProp.story.tsx
@@ -0,0 +1,31 @@
+import {storiesOf} from '@storybook/react';
+import * as React from 'react';
+import {useRenderProp} from '..';
+import ShowDocs from '../util/ShowDocs';
+
+const FaCC = ({children}) => {
+  return children('VALUE-FaCC');
+};
+const RenderProp = ({render}) => {
+  return render('VALUE-RenderProp');
+};
+
+const Demo = () => {
+  const [fragment1, [value1]] = useRenderProp(<FaCC />);
+  const [fragment2, [value2]] = useRenderProp(<RenderProp />);
+
+  return (
+    <>
+      {fragment1}
+      {fragment2}
+      <div>FaCC: {value1}</div>
+      <div>Render prop: {value2}</div>
+    </>
+  );
+};
+
+storiesOf('useRenderProp', module)
+  .add('Docs', () => <ShowDocs md={require('../../docs/useRenderProp.md')} />)
+  .add('Demo', () =>
+    <Demo/>
+  )
diff --git a/src/index.ts b/src/index.ts
index 68668652..6cbb5f6a 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -28,6 +28,7 @@ import useObservable from './useObservable';
 import useOrientation from './useOrientation';
 import useOutsideClick from './useOutsideClick';
 import useRaf from './useRaf';
+import useRenderProp from './useRenderProp';
 import useSetState from './useSetState';
 import useSize from './useSize';
 import useSpeech from './useSpeech';
@@ -72,6 +73,7 @@ export {
   useOrientation,
   useOutsideClick,
   useRaf,
+  useRenderProp,
   useSetState,
   useSize,
   useSpeech,
diff --git a/src/useRenderProp.ts b/src/useRenderProp.ts
new file mode 100644
index 00000000..53b34446
--- /dev/null
+++ b/src/useRenderProp.ts
@@ -0,0 +1,29 @@
+import * as React from 'react';
+import {useState, useCallback} from './react';
+import createMemo from './createMemo';
+
+const useRenderProp = (element: React.ReactElement<any>): [React.ReactElement<any>, any[]] => {
+  if (process.env.NODE_ENV !== 'production') {
+    if (!React.isValidElement(element)) {
+      throw new TypeError(
+        'useRenderProp element to be a valid React element ' +
+        'such as <MyRenderProp />.'
+      );
+    }
+  }
+
+  const [state, setState] = useState<any[]>([]);
+  const useSetState = createMemo((...args) => setState(args));
+  const render = useCallback((...args) => {
+    useSetState(...args);
+    return null;
+  }, []);
+  const cloned = React.cloneElement(element, {
+    render,
+    children: render,
+  });
+
+  return [cloned, state];
+};
+
+export default useRenderProp;