Running and debugging TypeScript
note
Debugging of TypeScript client-side code is only supported in Google Chrome and in other Chromium-based browsers.
For more information about running and debugging TypeScript with Angular, refer to Run an Angular application and Debug Angular applications.
In the editor, open the HTML file with a reference to the generated JavaScript file. This HTML file does not necessarily have to be the one that implements the starting page of the application.
Do one of the following:
Choose from the main menu or press AltF2. Then select the desired browser from the list.
Hover over the code to show the browser icons bar:
. Click the icon that indicates the desired browser.
Configure the built-in debugger as described in Configuring JavaScript debugger.
To enable source maps generation, open your tsconfig.json and set the
sourceMapproperty totrue, as described in Create a tsconfig.json file.Configure and set breakpoints in the TypeScript code.
Run the application in the development mode. Often you need to run
npm startfor that.Most often, at this stage TypeScript is compiled into JavaScript and source maps are generated. For more information, refer to Compiling TypeScript into JavaScript.
When the development server is ready, copy the URL address at which the application is running in the browser - you will need to specify this URL address in the run/debug configuration.
Go to . Alternatively, select Edit Configurations from the Run widget on the toolbar.
In the Edit Configurations dialog that opens, click the Add button (
) on the toolbar and select JavaScript Debug from the list. In the Run/Debug Configuration: JavaScript Debug dialog that opens, specify the URL address at which the application is running. This URL can be copied from the address bar of your browser as described in Step 3 above. 
From the Run widget list on the toolbar, select the newly created configuration and click
next to it. The URL address specified in the run configuration opens in the browser and the Debug tool window appears.You may need to refresh the page in the browser to get the controls in the Debug tool window available.
In the Debug tool window, proceed as usual: step through the program, stop and resume the program execution, examine it when suspended, view actual HTML DOM, run JavaScript code snippets in the Console, and so on.
In the Project tool window Alt01, right-click the TypeScript file to run or the starting file of your application and select from the context menu.
To run a scratch file, besides the above-mentioned methods, you can also click 
in the gutter and select the required action from the list.
Set the breakpoints where necessary.
In the Project tool window, right-click the TypeScript file to debug or the starting file of your application and select from the context menu.
next to it.
To debug a scratch file, besides the above-mentioned methods, you can also click in the gutter and select the required action from the list.
Go to . Alternatively, select Edit Configurations from the Run widget on the toolbar.
In the Edit Configurations dialog that opens, click the Add button (
) on the toolbar and select Node.js from the list. The Run/Debug Configuration: Node.js dialog opens.In the Node Parameters field, add
--require ts-node/register.Specify the Node.js interpreter to use.
If you choose the Project alias, IntelliJ IDEA will automatically use the project default interpreter from the Node interpreter field on the Node.js page . In most cases, IntelliJ IDEA detects the project default interpreter and fills in the field itself.
You can also choose another configured local or remote interpreter or click
and configure a new one.In the File field, specify the TypeScript file to run or debug. Depending on your workflow, you can do that explicitly or using a macro.
If you are going to always launch the same TypeScript file, click
and select this file in the dialog that opens. By default, the run/debug configuration gets the name of the selected file.If you need to launch different files, type
$FilePathRelativeToProjectRoot$. With this macro, IntelliJ IDEA will always launch the file in the active editor tab.
If necessary, specify any additional parameters for
ts-node(for example,--project tsconfig.json) in the Application parameters field.Save the configuration.
Depending on the way you specified your TypeScript file in the run/debug configuration, do one of the following:
If you typed the filename explicitly, select the required configuration from the Run widget on the toolbar and click
next to the list or press ShiftF10.If you specified a macro, open the TypeScript file to run in the editor, select the newly created configuration from the Run widget on the toolbar, and click
or press ShiftF10.
IntelliJ IDEA shows the output in the Run tool window.
In the TypeScript file to debug, set the breakpoints as necessary.
Depending on the way you specified your TypeScript file in the run/debug configuration, do one of the following:
If you typed the filename explicitly, select the required configuration from the Run widget on the toolbar and click
or press ShiftF9.If you specified a macro, open the TypeScript file to debug in the editor, select the newly created configuration from the Run widget and click
or press ShiftF9.
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