Set up linter + prettier configuration for the Expo repo

Adds a newer version of eslint-config-universe with base linter configurations. Each workspace does not yet have its own, more precise configuration right now.

The ESLint config contains root: true so that it doesn't inherit from ESLint configs higher up in the file system. There is also a prettierrc file that both prettier and eslint-config-universe will read i.e. our config is consistent.

Closes #3075

fbshipit-source-id: 0c6d05f

.eslintignore

@@ -0,0 +1,17 @@
+# Ignore all node_modules
+
+**/node_modules/**
+
+# Git submodules
+
+/react-native-lab/react-native/**
+
+# Other
+
+/android/**
+/fastlane/**
+/ios/**
+
+# TODO: Lint tools too
+/tools/**
+/tools-public/**

.eslintrc.js

@@ -0,0 +1,9 @@
+module.exports = {
+  root: true,
+  extends: ['universe/native', 'universe/node', 'universe/web'],
+  settings: {
+    react: {
+      version: '16',
+    },
+  },
+};

.prettierignore

@@ -0,0 +1 @@
+.eslintignore

.prettierrc

@@ -0,0 +1,7 @@
+{
+  "printWidth": 100,
+  "tabWidth": 2,
+  "singleQuote": true,
+  "jsxBracketSameLine": true,
+  "trailingComma": "es5"
+}

home/package.json

@@ -1,9 +1,11 @@
 {
   "name": "@expo/home",
-  "main": "node_modules/expo/AppEntry.js",
+  "version": "0.0.0",
+  "main": ".expo/AppEntry.js",
   "private": true,
   "description": "The Expo client app",
   "scripts": {
+    "postinstall": "expo-yarn-workspaces postinstall",
     "test": "jest"
   },
   "author": "650 Industries",
@@ -34,9 +36,9 @@
     "react": "^16.3.1",
     "react-apollo": "~1.0.1",
     "react-mixin": "^3.0.4",
-    "react-native": "expo/react-native#sdk-29",
+    "react-native": "*",
     "react-native-deprecated-custom-components": "^0.1.0",
-    "react-native-infinite-scroll-view": "^0.4.2",
+    "react-native-infinite-scroll-view": "^0.4.5",
     "react-navigation": "2.3.1",
     "react-navigation-material-bottom-tabs": "^0.3.0",
     "react-redux": "^5.0.1",
@@ -47,6 +49,7 @@
     "url": "^0.11.0"
   },
   "devDependencies": {
+    "expo-yarn-workspaces": "^1.0.0",
     "hashids": "^1.1.1",
     "jest-expo": "^27.0.0",
     "jsc-android": "^216113.0.0",

home/utils/addListenerWithNativeCallback.js

@@ -1,5 +1,4 @@
-import { DeviceEventEmitter } from 'react-native';
-import { NativeModules } from 'react-native';
+import { DeviceEventEmitter, NativeModules } from 'react-native';
 
 const { ExponentKernel } = NativeModules;
 

package.json

@@ -4,10 +4,24 @@
   "private": true,
   "author": "Expo",
   "license": "MIT",
+  "scripts": {
+    "lint": "eslint ."
+  },
   "exp": {
     "sdkVersion": "29.0.0"
   },
   "workspaces": {
-    "packages": ["apps/*", "home", "modules/*", "packages/*", "react-native-lab/react-native"]
+    "packages": [
+      "apps/*",
+      "home",
+      "modules/*",
+      "packages/*",
+      "react-native-lab/react-native"
+    ]
+  },
+  "devDependencies": {
+    "eslint": "^5.4.0",
+    "eslint-config-universe": "^2.0.0-alpha.0",
+    "prettier": "^1.14.2"
   }
 }

react-native-lab/transformer.js

@@ -16,6 +16,7 @@
  *     dependencies from react-native-lab's copy of react-native, to simulate
  *     if we hadn't forked the transformer at all
  */
+/*eslint-disable import/order */
 
 const babel = require('./react-native/node_modules/babel-core');
 const crypto = require('crypto');