Add postPublish hook example

with-postpublish-hooks/.babelrc

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+{
+  "presets": ["babel-preset-expo"],
+  "env": {
+    "development": {
+      "plugins": ["transform-react-jsx-source"]
+    }
+  }
+}

with-postpublish-hooks/.gitignore

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+node_modules/**/*
+.expo/*
+npm-debug.*

with-postpublish-hooks/.watchmanconfig

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+{}

with-postpublish-hooks/README.md

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+# postPublish hooks
+
+## How to use
+
+## Configure it
+
+- Create an incoming webhook for your Slack server and replace
+`https://hooks.slack.com/put-your-stuff-here` in `exp.json` with your
+webhook url -- or remove the `expo-postpublish-slack-notify` hook
+entirely from `exp.json`.
+
+## Running the app
+
+- `cd` into the `app` directory and run `yarn` or `npm install`
+- Open `app` with `exp` or XDE, try it out.
+
+## The idea behind the example
+
+It's common to need to perform a set of tasks once you publish an update
+to your project. For example, you may want to notify people on Twitter
+or Slack, upload sourcemaps and cut a release on Sentry, etc. This
+example demonstrates how you can write your own simple hooks with
+`./hooks/echo.js`, and install and use hooks distributed through npm,
+such as `expo-prepublish-slack-notify`.

with-postpublish-hooks/exp.json

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+{
+  "name": "with-postpublish-hooks",
+  "description": "Demo project with postPublish hooks. The actual app itself is empty, the interesting part is in the hooks configuration in exp.json",
+  "slug": "with-postpublish-hooks",
+  "privacy": "unlisted",
+  "sdkVersion": "16.0.0",
+  "version": "1.0.0",
+  "orientation": "portrait",
+  "icon": "https://s3.amazonaws.com/exp-brand-assets/ExponentEmptyManifest_192.png",
+  "loading": {
+    "icon": "https://s3.amazonaws.com/exp-brand-assets/ExponentEmptyManifest_192.png",
+    "hideExponentText": false
+  },
+  "packagerOpts": {
+    "assetExts": [
+      "ttf",
+      "mp4"
+    ]
+  },
+  "hooks": {
+    "postPublish": [
+      {
+        "file": "./hooks/echo",
+        "config": {
+          "message": "hello brent"
+        }
+      },
+      {
+        "file": "expo-postpublish-slack-notify",
+        "config": {
+          "webhookUrl": "https://hooks.slack.com/put-your-stuff-here"
+        }
+      }
+    ]
+  }
+}

with-postpublish-hooks/hooks/echo.js

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+module.exports = ({ config, log }) => {
+  log(config.message);
+}

with-postpublish-hooks/main.js

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+import Expo from 'expo';
+import React from 'react';
+import { StyleSheet, Text, View } from 'react-native';
+
+class App extends React.Component {
+  render() {
+    return (
+      <View style={styles.container}>
+        <Text>Open up main.js to start working on your app!</Text>
+      </View>
+    );
+  }
+}
+
+const styles = StyleSheet.create({
+  container: {
+    flex: 1,
+    backgroundColor: '#fff',
+    alignItems: 'center',
+    justifyContent: 'center',
+  },
+});
+
+Expo.registerRootComponent(App);

with-postpublish-hooks/package.json

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+{
+  "name": "with-postpublish-hooks",
+  "version": "0.0.0",
+  "description": "Hello Expo!",
+  "author": null,
+  "private": true,
+  "main": "main.js",
+  "dependencies": {
+    "expo": "16.0.0",
+    "expo-postpublish-slack-notify": "^1.0.0",
+    "react": "16.0.0-alpha.6",
+    "react-native": "https://github.com/expo/react-native/archive/sdk-16.0.0.tar.gz"
+  }
+}

with-victory-native/exp.json

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 {
   "name": "victory-native-example",
-  "description": "Using victory-native in Expo, see the source: , see the source: https://github.com/expo/examples/blob/master/with-victory-native",
+  "description": "Using victory-native in Expo, see the source: https://github.com/expo/examples/blob/master/with-victory-native",
   "slug": "victory-native-example",
   "privacy": "public",
   "sdkVersion": "16.0.0",