Integrate eslint with prettier

Passing through Prettier+ESLint for formatting but only ESLint for
linting/checking.

.travis/travis-checks-js.sh

@@ -15,7 +15,6 @@ fi
 
 if [ "$CHECK_CORRECTNESS" = true ] ; then
   npm run flow || pFail
-  npm run prettier:check || pFail
   npm run lint || pFail
 fi
 

.vscode/settings.json

@@ -1,3 +1,9 @@
 {
-    "javascript.validate.enable": false
+    "javascript.validate.enable": false,
+
+    // Enable/disable default JavaScript formatter (For Prettier)
+    "javascript.format.enable": false,
+
+    // Use 'prettier-eslint' instead of 'prettier'. Other settings will only be fallbacks in case they could not be inferred from eslint rules.
+    "prettier.eslintIntegration": true,
 }

package.json

@@ -41,8 +41,7 @@
     "test": "cross-env NODE_ENV=test node node_modules/jest/bin/jest.js --verbose --config jest.config.js",
     "test:debug": "cross-env NODE_ENV=test node --inspect-brk node_modules/jest/bin/jest.js --runInBand --verbose --config jest.config.js",
     "flow": "flow",
-    "prettier": "prettier --write $npm_package_config_jsfiles $npm_package_config_scssfiles",
-    "prettier:check": "prettier -l $npm_package_config_jsfiles $npm_package_config_scssfiles",
+    "prettier": "prettier-eslint --write $npm_package_config_jsfiles $npm_package_config_scssfiles",
     "clean": "yarn test --clearCache; watchman watch-del-all; rm -rf node_modules; rm -f yarn.lock; rm -rf $TMPDIR/react-*; rm -rf $TMPDIR/metro-cache-*; rm -rf $TMPDIR/jest_*",
     "clean:install": "yarn clean; yarn",
     "lint": "eslint $npm_package_config_jsfiles",
@@ -57,6 +56,7 @@
     "jsx-to-string": "^1.3.1",
     "memize": "^1.0.5",
     "node-sass": "^4.8.3",
+    "prettier-eslint": "^8.8.1",
     "react": "16.2.0",
     "react-native": "0.52.0",
     "react-native-recyclerview-list": "git+https://github.com/wordpress-mobile/react-native-recyclerview-list.git#bfccbaab6b5954e18f8b0ed441ba38275853b79c",