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# Motivation
We use Nix to package all of the dependencies for our dev environment. It does several things for us:
- Enables new devs on macOS or Linux to set up our dev environment with just one command
- Makes sure that everybody on the team is using the same versions of all the tools
- Allows us to isolate development dependencies from affecting the host system
For how Nix package management works, please refer to the official [how Nix works guide](https://nixos.org/guides/how-nix-works.html).
# Supported workflows
Some workflows require additional steps after the Nix installation. These steps are documented in [Workflow prerequisites](#workflow-prerequisites).
| Workflow | macOS supported |
| ------------------------------- | --------------- |
| `keyserver` (Node.js) | ✅ |
| `web` (Webpack) | ✅ |
| `native` iOS (React Native) | ✅ |
| `native` Android (React Native) | ✅ |
| C++ services | ❌ **\*** |
| Rust services | ✅ |
**\*** Workflow requires documentation; and it requires the RabbitMQ and AWS/Localstack services to be available.
# Requirements
To set up a dev environment using Nix, you will need a macOS or Linux machine.
# Prerequisites
## Nix package manager
To install and configure the [Nix package manager](https://nixos.org), please run:
```
./scripts/install_nix.sh
```
## Workflow prerequisites
On macOS, [installing Xcode](./nix_mobile_setup.md#xcode) is a prerequisite for all workflows.
- [Web prerequisites](./nix_web_setup.md#nix-web-requisities)
- [React Dev Tools Chrome extension](./nix_web_setup.md#react-dev-tools-chrome-extension)
- [Redux Dev Tools Chrome extension](./nix_web_setup.md#redux-dev-tools-chrome-extension)
- [Flipper (React Native Debugger)](./nix_mobile_setup.md#flipper)
- [Mobile prerequisites](./nix_mobile_setup.md#nix-mobile-prerequisites)
- [Xcode](./nix_mobile_setup.md#xcode)
- [Xcode settings](./nix_mobile_setup.md#xcode-settings)
- [Android Studio](./nix_mobile_setup.md#android-studio)
- [Android SDK](./nix_mobile_setup.md#android-sdk)
- [Android Emulator](./nix_mobile_setup.md#android-emulator)
- [Flipper (React Native Debugger)](./nix_mobile_setup.md#flipper)
# Development environment
Run `nix develop` to create a dev environment. Nix will handle the installation of all remaining dependencies not mentioned in [Workflow prerequisites](#workflow-prerequisites).
## Development workflows
- [Web workflows](./nix_web_workflows.md#development)
- [Flow typechecker](./nix_web_workflows.md#flow-typechecker)
- [Running keysever](./nix_web_workflows.md#running-keyserver)
- [Running web app](./nix_web_workflows.md#running-web-app)
- [Running landing page](./nix_web_workflows.md#running-landing-page)
- [Debugging](./nix_web_workflows.md#debugging)
- [React Developer Tools](./nix_web_workflows.md#react-developer-tools)
- [Redux Developer Tools](./nix_web_workflows.md#redux-developer-tools)
- [Debugging JavaScript](./nix_web_workflows.md#debugging-javascript)
- [Mobile workflows](./nix_mobile_workflows.md#mobile-workflows)
- [Running mobile app on iOS Simulator](./nix_mobile_workflows.md#running-mobile-app-on-ios-simulator)
- [Running mobile app on Android Emulator](./nix_mobile_workflows.md#running-mobile-app-on-android-emulator)
- [Running mobile app on physical iOS devices](./nix_mobile_workflows.md#running-mobile-app-on-physical-ios-devices)
- [Shared workflows](./nix_shared_workflows.md#shared-workflows)
- [Codegen](./nix_shared_workflows.md#codegen)
- [Codegen for JSI](./nix_shared_workflows.md#codegen-for-jsi)
- [Codegen for gRPC](./nix_shared_workflows.md#codegen-for-grpc)
- [Working with Phabricator](./nix_shared_workflows.md#working-with-phabricator)
- [Creating a new diff](./nix_shared_workflows.md#creating-a-new-diff)
- [Updating a diff](./nix_shared_workflows.md#updating-a-diff)
- [Working with a stack](./nix_shared_workflows.md#working-with-a-stack)
- [Committing a diff](./nix_shared_workflows.md#committing-a-diff)
- [Final notes](./nix_shared_workflows.md#final-notes)
## How Nix introduces dependencies to a development environment
-Nix installs packages in the Nix store at package-specific paths (e.g. `/nix/store-x7kdiasp...-clang/bin/clang`). When you run `nix develop`, Nix sets environment variables such as `PATH` to expose the binary dependencies to your shell. This model can be extended through shell hooks to support other build toolchains such as `pkg-config`, `cmake`, and many other language specific package managers by simply adding the repective toolchain to `nativeBuildInputs`.
+Nix installs packages in the Nix store at package-specific paths (e.g. `/nix/store/x7kdiasp...-clang/bin/clang`). When you run `nix develop`, Nix sets environment variables such as `PATH` to expose the binary dependencies to your shell. This model can be extended through shell hooks to support other build toolchains such as `pkg-config`, `cmake`, and many other language specific package managers by simply adding the respective toolchain to `nativeBuildInputs`.

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