Development

Installation

Both platforms

# install rustup
curl https://sh.rustup.rs -sSf | sh

# use 1.32.0 version
rustup toolchain install 1.32.0
rustup install 1.32.0
rustup target add wasm32-unknown-unknown --toolchain 1.32.0

Make sure rustc --version outputs 1.32.0, which is the stable version (and not nightly).

ios

Install cocoapods and download ios dependencies:

gem install cocoapods
cd ios && pod install

Install rust build targets: rustup target add aarch64-apple-ios armv7-apple-ios armv7s-apple-ios x86_64-apple-ios i386-apple-ios

Install cargo-lipo for building: cargo install cargo-lipo

Setup React Native third-party libraries (Run these after yarn install):

node_modules/react-native/scripts/ios-install-third-party.sh
node_modules/react-native/third-party/glog-0.3.5/configure

In case of problems generating the compiled targets for iOS. You can use the precompiled targets

sh install_precompiled_targets.sh

If you get an error of the style:

Could not list contents of '/Users/myself/yoroi-mobile/third-party/glog-0.3.5/test-driver'. Couldn't follow symbolic link.

Command for updating link ln -sf /usr/local/share/automake-<version>/test-driver <path_to_repo>/third-party/glog-0.3.5/test-driver

android

Windows (Physical device)

This requires a physical Android phone & USB cable

1. Download VirtualBox
2. Expose the USB to VirtualBox guide here Note: You MUST expose USB 2.0 for Android devices. Exposing 3.0 will not work
3. If your devices still doesn't appear, follow these steps Note: The format for these steps have changed over the years so be careful if you need this.

Windows (Virtual Device)

On Host (Setup Android device)

1. Run Virtual Device from Android Studio

On VM (Detect VirtualDevice from VirtualBox)

1. adb tcpip 5555
2. adb kill-server
3. adb connect 10.0.2.2:5555

On Host (allow app to connect to packaged bundle after build)

1. Open VirtualBox
2. VM Settings > Network >> Advanced > Port Forwarding
3. Enter 8081 as Host Port and Guest Port (leave everything else blank)

Android Setup

# install & setup android studio
follow https://facebook.github.io/react-native/docs/getting-started.html (tab Building Projects with Native Code)

1. Ask for a copy of (or create a blank version of) android/gradle.properties.local
2. Make sure your Anddroid build tools match the version in android/build.gradle (you will get an error otherwise)
3. Download the NDK from Android Studio (see here for instructions)
4. Install Rust for Android rustup target add aarch64-linux-android armv7-linux-androideabi i686-linux-android x86_64-linux-android

First time

Make sure the rust targets for the platform you will work on (android/iOS) have been correctly installed with rustup show. Then:

1. yarn install
2. yarn setup_configs - links libraries to ios testnet build configurations

If these steps fail, try looking at the android CLI

Launching

1. react-native start - this will run RN packager, let it running (optional step)

2. react-native run-android --variant=devDebug - for version with testnet

3. react-native run-android --variant=mainnetDebug - for version with mainnet

4. react-native run-ios --scheme=emurgo-staging --configuration=Staging.Debug - staging (testnet) configuration

5. react-native run-ios --scheme=emurgo --configuration=Debug - production configuration

Debugging

Read through this page to understand debugging for React-Native

React-Native Debugger

This will allow you to put breakpoints and everything else you would ever need.

1. Download & run https://github.com/jhen0409/react-native-debugger/releases
2. While app is running, open debug menu
3. Select Debug JS remotely

Releasing

1. Follow Signed Android APK to generate and setup signing certificate for Android (required only before first release).
2. cd android
3. ./gradlew assembleMainRelease

Important: You may run into Could not follow symbolic link third-party/glog-0.3.5/test-driver error if you try to build Android release on Mac. This is caused by incorrect linking in react-native/npm. To fix the issue, locate path where automake is installed (default /usr/local/share) and re-link file by running command:

ln -sf /usr/local/share/automake-<version>/test-driver <path_to_repo>/third-party/glog-0.3.5/test-driver

Code style

Imports

The imports should be in this order:

1. import of external libraries
2. import of our custom code
3. import of component styles
4. import of types

Example:

// @flow

// external libraries
import React from 'react'
import {compose} from 'redux'
import {connect} from 'react-redux'
import {View} from 'react-native'

// our code
import Screen from '../../components/Screen'
import AdaIcon from '../../assets/AdaIcon'
import {confirmationsToAssuranceLevel, printAda} from '../../helpers/utils'

// styles
import styles from './TxDetails.style'

// types
import type {NavigationScreenProp, NavigationState} from 'react-navigation'
import type {TransactionType} from '../../types/HistoryTransaction'

Styles

• If you use component in multiple screens, it should be in UiKit folder with other UI components and imported from it.
• Each component file has own file with styles.
• Don't import multiple style files into one component.
• Keep the style's structure flat.
• If there is same component in UiKit as in react-native, use the one from UiKit.

// src/components/UiKit/index.js
// Example of export for a default component that can be imported from UI.
export {default as Button} from './Button'

import {Text, Button, Input} from '../UiKit'

// ...

Variables

import {colors} from './config'

// Wrong
// The background color can change, gray is constant name for specific color.
background: colors.GRAY
// ...

// Good
// Changing the background color doesn't require to change the name.
// We want to change values, not labels most of time.
background: colors.background
// ...