IntelliJ IDEA 2019.1 Help

Run/Debug Configuration: React Native

Run | Edit Configurations | Add New Configuration | React Native


In this dialog, create configurations for running React Native applications.

Before you start

Getting access to the Run/Debug Configuration: React Native dialog

  1. Download and install Node.js.

  2. Install a React Native package, for example react-native-cli.

React Native-specific configuration settings

Item

Description

Build and launch application

  • Select the Build and launch checkbox if you are launching your application for the first time or if you have updated its native code since the last run.

  • Clear this checkbox if you haven't made any changes to the native code of your application since the last build. When you start debugging, IntelliJ IDEA waits for you to open your application in the simulator with the Remote debug enabled as described on the React Native official website.

  • If your application uses Expo, clear the checkbox because this bundler takes care of the process itself.

Platform

In this area, choose the platform for which the application is intended. Depending on your choice, IntelliJ IDEA will run the bundler with react-native run-ios or with react-native run-android.

  • To emulate the Android platform, use an Android virtual device.

  • To emulate the iOS platform, you need to install the ios-sim command line tool globally. You can do it through the Node Package Manager (npm), see npm and Yarn, or by running the sudo npm install ios-sim -g command, depending on your operating system.

Arguments

In this field, type the arguments to be passed to React Native, for example, specify the simulator type through the ‑‑simulator flag: ‑‑simulator="iPhone 4s".

Browser for debugging

In debugging React Native applications, IntelliJ IDEA relies on the Chrome runtime, which is used by React Native itself. You can also use DevTools together with IntelliJ IDEA. When you initiate a debugging session, IntelliJ IDEA starts a new Chrome instance and attaches to it. If you don’t want to see any new Chrome windows, use the Chrome Headless mode.

Bundler host

In this field, specify the host where the bundler runs, the default value is localhost.

If you are using Expo, you may need to change the default bundler host to ensure successful connection with the debugger. This connection may fail because IntelliJ IDEA by default uses localhost to start debugging while Expo expects 127.0.0.1 or an external IP address depending on what is selected in Connection field of the Metro bundler configuration. See Debugging a React Native application that uses Expo for details.

Bundler port

In this field, specify the port on which the bundler runs.

  • IntelliJ IDEA automatically chooses 8081, which is default for the React Native bundler. Learn more from the React Native official website.

  • If your application uses Expo, change the port to 19001.

Node interpreter

In this field, specify the Node.js interpreter to use. This can be a local Node.js interpreter or a Node.js on Windows Subsystem for Linux.

React Native package

In this field, specify the path to react-native-cli.

Working directory

specify the working directory of the application. By default, the field shows the project root folder.

Environment variables

In this field, optionally, type the environment variables for executing the react-native run-android or the react-native run-ios command.

Common options

When you edit a run configuration (but not a run configuration template), you can specify the following options:

Item

Description

Name

In this field, specify the name for the run/debug configuration. The name will help you identify the created configuration when you choose to edit it later, or when you invoke it, for example, from the Run popup (Shift+Alt+F10).

Share

Select this checkbox to make the run/debug configuration available to other team members.

If the directory-based project format is used, the settings for a run/debug configuration are stored in a separate .xml file in the .idea\runConfigurations folder if the run/debug configuration is shared, or in the .idea\workspace.xml file otherwise.

If the file-based format is used, the settings are stored in the .ipr file for shared configurations, or in the .iws file otherwise.

Allow running in parallel

If this checkbox is selected, it is possible to launch a run configuration multiple times in parallel instead of rerunning it. Each runner will start in its own tab of the Run Tool Window or Debug Tool Window.

When disabled, every time a new instance of the run/debug configuration is launched, IntelliJ IDEA checks the presence of the other instances of the same run/debug configuration, and displays a confirmation dialog. If you click OK in the confirmation dialog, the first instance of the runner will be stopped, and the next one will take its place. This makes sense when launching two instances of run/debug configurations of the same type consumes too much of the CPU and memory resources..

Toolbar

The tree view of run/debug configurations has a toolbar that helps you manage configurations available in your project as well as adjust default configurations templates.

Item

Shortcut

Description

the Add buttonAlt+Insert

Create a run/debug configuration.

the Remove buttonAlt+Delete

Delete the selected run/debug configuration. Note that you cannot delete default configurations.

Copy

Ctrl+D

Create a copy of the selected run/debug configuration. Note that you create copies of default configurations.

Save configuration

The toolbar shows this button only when you select a temporary configuration. Click this button to save a temporary configuration as permanent.

Edi Templates

Edit Templates. View and edit the default template for the selected run/debug configuration. The templates are used for newly created configurations.

Method up/Method down

Alt+Up/Alt+Down

Move the selected run/debug configuration up and down in the list.

The order of configurations in the list defines the order, in which the configurations appear when you choose a run/debug configuration.

Default templates of run/debug configurations are always sorted alphabetically.

Move into new folder / Create new folder

Move into new folder / Create new folder. You can group run/debug configurations by placing them into folders.

To create a folder, select the configurations within a category, click Folder, and specify the folder name. If only a category is in focus, an empty folder is created.

Then, to move a configuration into a folder, between the folders or out of a folder, use drag or Move Up and Move Down buttons.

To remove grouping, select a folder and click Remove Configuration.

Sort configurations

Click this button to sort configurations in the alphabetical order.

Before Launch options

In this area you can specify tasks that must be performed before starting the selected run/debug configuration. The tasks are performed in the order they appear in the list.

Item

Shortcut

Description

the Add buttonAlt+Insert

Click this icon to add one of the following available tasks:

  • Run External tool: select to run an external application. In the dialog that opens, select one or multiple applications you want to run. If it is not defined in IntelliJ IDEA yet, add its definition. For more information, see Configuring Third-Party Tools and External Tools.

  • Run Another Configuration: select to execute another run/debug configuration. In the dialog that opens, select the configuration to be run.

  • Build Artifacts: select this option to build an artifact or artifacts. In the dialog that opens, select the artifact or artifacts that should be built.

  • Launch Web Browser: select this option to have a browser started.C In the dialog that opens, select the type of the browser and provide the start Url. Also, specify if you want the browser be launched with JavaScript debugger.

  • Run Ant target: select this option to run an Ant target. In the dialog that opens, select the target to be run.

  • Run Grunt task: select this option to run a Grunt task.

    In the Grunt task dialog that opens, specify the Gruntfile.js where the required task is defined, select the task to execute, and specify the arguments to pass to the Grunt tool.

    Specify the location of the Node.js interpreter, the parameters to pass to it, and the path to the grunt-cli package.

  • Run Gulp task: select this option to run a Gulp task.

    In the Gulp task dialog that opens, specify the Gulpfile.js where the required task is defined, select the task to execute, and specify the arguments to pass to the Gulp tool.

    Specify the location of the Node.js interpreter, the parameters to pass to it, and the path to the gulp package.

  • Run Maven Goal: select this option to run a Maven goal. In the dialog that opens, select the goal to be run.

  • Run npm Script: select this option to execute an npm script.

    In the NPM Script dialog that opens, specify the npm run/debug configuration settings.
  • Start React Native Bundler: select this option to run the bundler automatically, as part of a running or debugging session. by default, this is done through react-native start. If your application uses Expo, you need to run the development server via the start npm task. To do that, click Add, then in the Configure React Native dialog, choose npm script and select start from the list.

  • Generate CoffeeScript Source Maps: select this option to generate the source maps for your CoffeeScript sources. In the dialog that opens, specify where your CoffeeScript source files are located.

  • Run Remote External tool: adds a remote SSH external tool.

the Remove buttonAlt+Delete

Click this icon to remove the selected task from the list.

Edit

Enter

Click this icon to edit the selected task. Make the necessary changes in the dialog that opens.

Method up/Method down

Alt+Up/Alt+Down

Click these icons to move the selected task one line up or down in the list. (The tasks are performed in the order that they appear in the list.)

Show this page

Select this checkbox to show the run/debug configuration settings prior to actually starting the run/debug configuration.

Activate tool window

By default this checkbox is selected and the Run or the Debug tool window opens when you start the run/debug configuration.

Otherwise, if the checkbox is cleared, the tool window isn't shown. However, when the configuration is running, you can open the corresponding tool window for it yourself by pressing Alt+4 or Alt+5.

Last modified: 20 May 2019