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Calin Tamas
Calin Tamas

Posted on • Edited on

How to manage staging and production environments in React Native

#reactnative #mobile #app #fastlane

Your life as a React Native developer is just about to get easier. At least mine did, as soon as I learned how to manage staging and production environments in React Native. It doesn't change the way your React Native app looks, feels or sells. But it saves you a great deal of developer hustle.

I originally posted this on around25's blog.

It's a breeze to change a config when there's only one or two changes to be done. You switch the API host to the production one and bam, you're done. Things only get harder and much more error-prone when you have to change the API host, put the payment gateway key, payment gateway host, set the notifications .plist file, update the crashlytics key and update the analytics key. Do this by hand every time you make a build and at some point I guarantee you're going to miss something.

So to avoid headaches, we're going to use environment variables.

To expose env variables to react-native, I'm going to use the react-native-config library. By doing so, I am keeping the config variables away from the code. It's most likely that those vars are going to be different across environments, while the code is not.

First of all, I'm going to add the library to the project. As I'm writing this, the latest version for react-native-config is 0.11.7. Then, I have to create 3 env files in the root of the project: one for the local environment, simply called .env, and another two called .env.staging and .env.production.



// .env
IS_PRODUCTION=false
API_HOST=https://api.staging.foobar.com

// .env.staging
IS_PRODUCTION=false
API_HOST=https://api.staging.foobar.com

// .env.production
IS_PRODUCTION=true
API_HOST=https://api.foobar.com
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For now, I'm only keeping the API host in the config, alongside with an IS_PRODUCTION flag. We'll use that later. Obviously, both https://api.staging.foobar.com and https://api.foobar.com are fictional 🙂.

Now, to put those vars to use for my React Native app, here's how my config file usually looks like:



// src/config/index.js

import env from 'react-native-config'

const config = {
  api: {
    host: env.API_HOST,
    timeout: 20000
  }
};

const API_HOST = config.api.host;

export {
  API_HOST
}

export default config
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That's all. By default, react-native-config reads from the .env file, but reading from any file & running the project is possible via the following command:



$ ENVFILE=.env.staging react-native run-ios
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All good so far, but I want my build process to be as automated as possible. So manually specifying the .env file is not acceptable. Avoiding this is what we're going to do next.

iOS setup

On iOS, I'm going to take advantage of the concept of schemes. An Xcode scheme defines a collection of targets to build & a configuration to use when building. The default one can be found in Xcode's menu bar:



Product -> Scheme -> FooBar
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where FooBar is the name of my app.

show ios product scheme

What I'm going to do is duplicate that default scheme and create two new schemes: one for staging and one for production. We're going to use the default one for the local environment. You can do it by going to:



Product -> Scheme -> Edit Scheme -> Duplicate Scheme
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xcode 2

I'm going to call them FooBar.staging and FooBar.production. Naming is going to be important when we write the automated build script later.

I'm going to select FooBar.staging and go back to Edit Scheme, to make sure my scheme loads up the .env file I want. Here, on Build -> Pre-actions I'm adding a script that does that.

add pre build script

add pre build script part 2

I'm going through exactly the same process for FooBar.production.

Now, I got everything set up for iOS. Whenever I'm building the app, by selecting a scheme, I get the right env vars loaded in. Kudos, let's go to Android.

Android setup

For Android, we have build types. In android/app/build.gradle, under buildTypes we have the two default build types, release and debug.



buildTypes {
    release {
        minifyEnabled enableProguardInReleaseBuilds
        proguardFiles getDefaultProguardFile("proguard-android.txt"), "proguard-rules.pro"
        signingConfig signingConfigs.release
    }
    debug {
        debuggable true
    }
}
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Same as before, the default is going to use the local env vars.

For the new build types, add these lines:



stagingrelease {
    initWith release
}
productionrelease {
    initWith release
}
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Each of those is going to be used for making a release-type build, so make sure to generate a signing key before proceeding.

Naming is very important at this step. First, you must have the token release in the build variant name for regular release build behavior to apply, see more here. Second, I had issues when I initially set up the names to releaseStaging and releaseProduction, as the correct .env file was not loading. I googled it up and found the issue & solution here.

Now, at the very top of the same android/app/build.gradle file, add this:



project.ext.envConfigFiles = [
        debug: ".env",
        release: ".env",
        stagingrelease: ".env.staging",
        productionrelease: ".env.production"
]
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You might encounter problems with Proguard for release builds. The solution is here.

To run the app using one of the build types defined above, go to View -> Tool Windows -> Build Variants and select the variant (in the newly exposed window) before building:

android build variants window

That's it for Android too. Next, we're going to automate our build process even more, by creating fastlane scripts.

My aim is to have a one-liner build script for each of the two platforms.

Bonus: fastlane scripts

First, we are going to install fastlane and go through the setup. fastlane init has to be run inside an iOS or Android project, so we're going to do it inside the ios folder and then move the whole fastlane folder to the root of the project.

In fastlane/Fastfile, I'm creating a lane under the ios platform to upload a build to TestFlight. Fastlane automatically loads the .env file we are passing when running the script. If we do:



$ fastlane ios beta --env=production
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it will load the .env.production file. So we are all set. To test this, I am going to add a few lines that only print out the environment vars and the file that was loaded.



// fastlane/Fastfile

platform :ios do
  desc "Submit a new build to TestFlight"
  lane :beta do
    app_identifier = "com.app.identifier"

    api_environment = "staging"
    if ENV["IS_PRODUCTION"] == "true"
      api_environment = "production"
    end

    ENV["ENVFILE"]=".env.#{api_environment}"

    puts "API_HOST: #{ENV['API_HOST']}"
    puts "IS_PRODUCTION: #{ENV['IS_PRODUCTION']}"
    puts "ENVFILE: #{ENV['ENVFILE']}"
    end
  end
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If everything is right, we should see this printed out:



[18:16:52]: Loading from './/../.env.production'
[18:16:52]: Driving the lane 'ios beta' 🚀
[18:16:52]: API_HOST: https://api.foobar.com
[18:16:52]: IS_PRODUCTION: true
[18:16:52]: ENVFILE: .env.production
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Before making a new build, we may want to increment the build number and/or build version. Add these lines to the file:



increment_version_number(
    xcodeproj: './ios/FooBar.xcodeproj',
    bump_type: "patch",
    # bump_type: "minor",
    # bump_type: "major",
    # version_number: "1.0.0"
)
increment_build_number(
  xcodeproj: './ios/FooBar.xcodeproj',
  # build_number: '74'
)
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Now, to create a build, add the following lines. Remember that at the beginning of the article I mentioned that the naming of the schemes will be important later. Well, this is why:



gym(
    xcodeproj: './ios/FooBar.xcodeproj',
    scheme: "FooBar.#{api_environment}"
)
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Finally, I'd like my script to also upload the build to TestFlight, so I do this:



pilot(
    app_identifier: app_identifier,
    email: "itunesconnect_email",
    first_name: "itunesconnect_first_name",
    last_name: "itunesconnect_last_name",
    ipa: "./FooBar.ipa",
    distribute_external: true,
    skip_submission: true,
    skip_waiting_for_build_processing: false
)
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It's almost the same process for Android, but instead of the gym and pilot actions, we are using gradle and supply. The lane looks something like this:



platform :android do
  desc "Submit a new build to Google Play Console"

  lane :beta do
    app_identifier = "com.app.identifier"

    api_environment = "staging"
    if ENV["IS_PRODUCTION"] == "true"
      api_environment = "production"
    end
    ENV["ENVFILE"]=".env.#{api_environment}"

    puts "API_HOST: #{ENV['API_HOST']}"
    puts "IS_PRODUCTION: #{ENV['IS_PRODUCTION']}"
    puts "ENVFILE: #{ENV['ENVFILE']}"

    gradle_file = "./android/app/build.gradle"

    android_set_version_name(
      version_name: "1.0.0",
      gradle_file: gradle_file
    )

    android_set_version_code(
      gradle_file: gradle_file
    )

    gradle(
      project_dir: './android',
      task: 'assemble',
      build_type: 'release'
    )

    supply(
      json_key: 'google_play_console_key',
      track: 'beta',
      apk: './android/app/build/outputs/apk/release/app-release.apk',
      package_name: app_identifier
    )
  end
end
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Final thoughts on Staging and Production Environments in a React Native App

Before I leave you, I'd like to express my thoughts on what I believe it would be best practice regarding source control.

I suggest committing real values to .env (the local environment), but keeping .env.staging and .env.production with dummy/non-sensitive values that are replaced on the build machine only at build time.

So the three files would look something like this in the repo:



// .env
IS_PRODUCTION=false
API_HOST=https://api.staging.foobar.com

// .env.staging
IS_PRODUCTION=false
API_HOST=api_host

// .env.production
IS_PRODUCTION=true
API_HOST=api_host
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The complete source code can be found on Github.

Feel free to tell me what you think or if you have any suggestions for the solutions I advanced above.

Thanks,

Latest comments (28)

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amandine16 profile image
Amande •

I couldn't get the environment variables on android. There was a step missing.
In the file android/app/build.gradle, you have to add a line that is not indicated in the tutorial.

The tutorial is very complete.

This line was missing: apply from: project(':react-native-config').projectDir.getPath() + "/dotenv.gradle "

I had to insert it after project.ext.envConfigFiles and my other plugin apply ... Otherwise it didn't work.

Hopefully I helped someone =)

Here are the first lines of code in android/app/build.gradle

project.ext.envConfigFiles = [
debug: ".env",
release: ".env",
stagingrelease: ".env.staging",
productionrelease: ".env.production"
]
apply plugin: "com.android.application"
apply plugin: 'com.google.gms.google-services'
apply from: project(':react-native-config').projectDir.getPath() + "/dotenv.gradle"
import com.android.build.OutputFile
...

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jotahws profile image
João Henrique Wind •

Just a heads up for those trying to do this in a newer version of react-native-config.
According to the docs, the new Script Action for the iOS scheme should be the following:

cp "${PROJECT_DIR}/../.env.staging" "${PROJECT_DIR}/../.env"

and NOT

echo ".env.staging" > /tmp/envfile

Reference:
github.com/luggit/react-native-con...

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jaapweijland profile image
Weijland •

Note that since v 2.148.0 of Fastlane the follow line:

fastlane ios beta --env=production

should be

fastlane ios beta --env production

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bobrundle profile image
Bob Rundle • • Edited

Spent quite some getting env files to switch with build type. Discovered that you need to apply dotenv.gradle after envConfigFiles are defined.

project.ext.envConfigFiles = [
    debug: ".env",
    release: ".env",
    stagingrelease: ".env.staging",
    productionrelease: ".env.production"
]
apply from: project(':react-native-config').projectDir.getPath() + "/dotenv.gradle"
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sauloaguiar profile image
Saulo Aguiar •

Hey Calin!
Thanks for coming up with this tutorial!
After I replicated the steps, I wasn't getting any error but my .env.staging file wasn't being read.
I noticed in your github repo that for the android project there's an apply rule for the react-native-config project in the buidl.grade file.

apply from: project(':react-native-config').projectDir.getPath() + "/dotenv.gradle"

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bobrundle profile image
Bob Rundle •

Had to add matching fallbacks to my custom releases to get this working on Android.

    stagingrelease {
        initWith release
        matchingFallbacks = ['release', 'debug']
    }
    productionrelease {
        initWith release
        matchingFallbacks = ['release', 'debug']
    }
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suleiman365 profile image
Suleiman Ahmed •

Great tutorial, Calin.

Small issue, please.

"To run the app using one of the build types defined above, go to View -> Tool Windows -> Build Variants and select the variant (in the newly exposed window) before building:"

The above step doesn't seem to work for me. Perhaps, I'm doing something wrong on the Android front. When I do the above, I noticed that the newly added release configs (i.e productionrelease or stagingrelease) doesn't show in the dropdown of the other third party native packages, such as 'react-native-config', for example. And when I go ahead to select, say, 'stagingrelease', I get this error: ERROR: Unable to resolve dependency for ':app@stagingrelease/compileClasspath': Could not resolve project :react-native-gesture-handler and this: ERROR: Unable to resolve dependency for ':app@stagingreleaseUnitTest/compileClasspath': Could not resolve project :@react-native-community_async-storage.
And so on (listing all my third party packages).

Thanks.

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bobrundle profile image
Bob Rundle •

This is the same problem I had. You need to have fallback build type because you have other projects for which staging and production releases are not defined. See my post in these comments.

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praveens96 profile image
praveens96 •

need to do add Library Search paths in-order get it working, for me I have Realm, YouTube etc libraries for which .a files were in Linked libraries. I was getting ld: library not found -lRealmJS error.

so, I followed: stackoverflow.com/a/40661027/4065202 to resolve the issue

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giacomocerquone profile image
Giacomo Cerquone •

Hi, let me know what do you think about my alternative solution: dev.to/giacomocerquone/re-thinking...

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calintamas profile image
Calin Tamas •

Nice way of doing it!

My reason for using react-native-config was that I needed to access the env vars inside the native projects as well.

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giacomocerquone profile image
Giacomo Cerquone •

Well in that case yes, it's a must :)

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jadhavrahul10 profile image
rahul •

Hi,
Actually i want to setup 3 env. i.e dev, stage (Flavor) ,prod( release ) and
1.for dev it's debuggable by default
2.for stage i want to setup debug.keysore (for debugging ) and release.keysore (for release testing we can se pre prod ) different
3.And prod release i want different prod.keystore how can i manage this thing.

hoe can i mange this things in buildTypes , productFlavors , signingConfigs?

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