🐛 Bug Report

installing react-native 0.57.8 via npm install the ReactCommon/jsi folder is missing and this causes build errors using "react-native run-ios"

you can see here the folder is missing:

To Reproduce

• Have "react-native": "^0.57.8" as a dependency in package.json
• run npm install
• run react-native run-ios

Expected Behavior

App should build and run on the simiulator

Environment

System:
OS: macOS 10.14.3
CPU: (12) x64 Intel(R) Core(TM) i9-8950HK CPU @ 2.90GHz
Memory: 8.28 GB / 32.00 GB
Shell: 3.2.57 - /bin/bash
Binaries:
Node: 8.6.0 - ~/.nvm/versions/node/v8.6.0/bin/node
Yarn: 1.13.0 - /usr/local/bin/yarn
npm: 5.3.0 - ~/.nvm/versions/node/v8.6.0/bin/npm
SDKs:
iOS SDK:
Platforms: iOS 12.1, macOS 10.14, tvOS 12.1, watchOS 5.1
IDEs:
Xcode: 10.1/10B61 - /usr/bin/xcodebuild
npmPackages:
react: 16.6.3 => 16.6.3
react-native: ^0.57.8 => 0.57.8
npmGlobalPackages:
react-native-cli: 2.0.1
react-native-git-upgrade: 0.2.7
react-native: 0.58.6