IntelliJ IDEA 2024.1 Help

Angular

Angular is a popular framework for building cross-platform applications. IntelliJ IDEA provides support for Angular and helps you on every step of the development process – from creating a new Angular app and working on the components to debugging and testing it.

Before you start

  1. Download and install Node.js.

  2. Make sure the JavaScript and TypeScript and Angular and AngularJS required plugins are enabled on the Settings | Plugins page, tab Installed. For more information, refer to Managing plugins.

Create a new Angular application

The recommended way to start building a new Angular application is Angular CLI, which IntelliJ IDEA downloads and runs for you using npx. As a result, your application is bootstrapped with a ready-to-use TypeScript and Webpack configuration.

Of course, you can download Angular CLI yourself or create an empty IntelliJ IDEA project and install Angular in it.

Create a new Angular app
  1. Select File | New | Project from the main menu or click the New Project button on the Welcome screen.

  2. In the left-hand pane, choose Angular CLI.

  3. Specify the project name and the folder to create it in. In the Node Interpreter field, specify the Node.js interpreter to use. Select a configured interpreter from the list or choose Add to configure a new one.

    From the Angular CLI list, select npx --package @angular/cli ng.

    Alternatively, for npm version 5.1 and earlier, install the @angular/cli package yourself by running npm install -g @angular/cli in the Terminal Alt+F12. When creating an application, select the folder where the @angular/cli package is stored.

  4. Optionally:

    • In the Additional parameters field, specify the extra ng new options to pass to Angular CLI. Code completion is available in this field: as you start typing the name of an option or press Ctrl+Space, IntelliJ IDEA shows you the available options and their description.

    • If you are using Angular version 16 or later, you can also select the Create new project with standalone components checkbox. Learn more from the Angular official website.

  5. When you click Create, IntelliJ IDEA generates an Angular-specific project with all the required configuration files and downloads all the necessary dependencies.

Create an empty IntelliJ IDEA project

  1. Select File | New | Project from the main menu or click the New Project button on the Welcome screen.

  2. In the New Project dialog, select New Project in the left-hand pane.

  3. In the right-hand pane, select JavaScript in the Language area.

  4. Name the new project and change its location if necessary, then click Create.

  5. When you click Create, IntelliJ IDEA creates and opens an empty project.

Install Angular in an empty project

  1. Open the empty project where you will use Angular.

  2. In the embedded Terminal (Alt+F12) , type:

    npm install @angular/core

    That will install the core Angular package with the critical runtime parts of the framework.

You may also need to install other packages that are parts of Angular, refer to the list of packages.

Start with an existing Angular application

To continue developing an existing Angular application, open it in IntelliJ IDEA and download the required dependencies.

Open the application sources that are already on your machine

  • Click Open or Import on the Welcome screen or select File | Open from the main menu. In the dialog that opens, select the folder where your sources are stored.

Check out the application sources from your version control

  1. Click Get from VCS on the Welcome screen.

    Alternatively, select File | New | Project from Version Control or Git | Clone or VCS | Get from Version Control from the main menu.

    Instead of Git in the main menu, you may see any other Version Control System that is associated with your project. For example, Mercurial or Perforce.

  2. In the dialog that opens, select your version control system from the list and specify the repository to check out the application sources from. For more information, refer to Check out a project (clone).

Download the dependencies

  • Click Run 'npm install' or Run 'yarn install' in the popup:

    Open an application and download the dependencies

    You can use npm, Yarn 1, or Yarn 2, refer to npm and Yarn for details.

  • Alternatively, select Run 'npm install' or Run 'yarn install' from the context menu of package.json in the editor or in the Project tool window.

Project security

When you open a project that was created outside IntelliJ IDEA and was imported into it, IntelliJ IDEA displays a dialog where you can decide how to handle this project with unfamiliar source code.

Untrusted project warning

Select one of the following options:

  • Preview in Safe Mode: in this case, IntelliJ IDEA opens the project in a preview mode. It means that you can browse the project's sources but you cannot run tasks and script or run/debug your project.

    IntelliJ IDEA displays a notification on top of the editor area, and you can click the Trust project link and load your project at any time.

  • Trust Project: in this case, IntelliJ IDEA opens and loads a project. That means the project is initialized, project's plugins are resolved, dependencies are added, and all IntelliJ IDEA features are available.

  • Don't Open: in this case, IntelliJ IDEA doesn't open the project.

Learn more from Project security.

Write and edit your code

This chapter provides Angular-specific hints. For general guidelines, refer to Write and edit source code and TypeScript.

Create Angular components

With IntelliJ IDEA, you can create Angular components in several ways:

Create a component using a predefined template

IntelliJ IDEA provides predefined live templates for creating Angular components, such as a-component, a-component-inline, and a-component-root.

Create an Angular component using a predefined code snippet

For more information about live templates, refer to Live templates.

To view a full list of predefined templates, open the Settings dialog (Ctrl+Alt+S) , go to Editor | Live Templates, and expand the Angular node.

  1. In the editor, press Ctrl+J, select the appropriate template (for example, a-component) from the list, and then press Enter.

  2. IntelliJ IDEA generates a component stub, places the caret at a field with canvas, and waits for you to specify the component name there. As you type the component name, the name of the selector and the template URL are filled in automatically in accordance with the Angular Style Guide.

  3. If necessary, make the new component standalone using a the inspection pop-up.

    Make component standalone

Learn how to customize a template with variables from Using and Creating Code Snippets in WebStorm Blog.

Create a component folder

In IntelliJ IDEA, you can create a bunch of files for an Angular component in one action and even place them all in a separate folder. To do that, you need to use a file template with several child templates. When you create a file from the parent template, the related files from the child templates are generated automatically. For more information, refer to Templates with multiple files.

Suppose you want to create an example folder with a bunch of component files, for example, example.component.ts for logic, example.component.html for the template, and example.component.css for styles. You can create a file template with two parent templates so all the three files will be generated at once and placed in a separate folder.

  1. In the Settings dialog (Ctrl+Alt+S) , select Editor | File and Code Templates.

  2. First create a template for a TypeScript component file:

    1. In the Files tab, click the Add button (the Create Template button) on the toolbar.

      Add new template

      A new, Unnamed, template is added to the list.

    2. In the right-hand pane, specify the template name, let it be Angular Component, and component.ts as the file extension.

    3. In the File name field, type $NAME/$NAME.

    4. Optionally, add a code template, for example:

      /* * Created by ${USER} on ${DATE} */ import { Component } from '@angular/core';
    Create parent template

    Click Apply.

  3. Create a child template for the related HTML file:

    1. Select the parent template Angular Component and click the Create Child Template File button the Create Child Template File on the toolbar.

      Add child template icon

      A child template is added below the Angular Component template.

    2. In the right-hand pane, type $NAME/$NAME in the File name field and specify the component.html extension.

    Create child template: component.html

    Click Apply.

  4. Create a child template for the related Style Sheet.

    1. Select the parent template Angular Component and click the Create Child Template File on the toolbar. A child template is added below the Angular Component template.

    2. In the right-hand pane, type $NAME/$NAME in the File name field and specify the component.css extension.

  5. Click OK to save the templates.

  6. Create the component files.

    From the context menu of the folder where you want to store the component files, select New | Angular Component. In the dialog that opens, specify the name that will be used for the folder and for the component files in it (example in this example).

    Create an Angular component from a multiple files template in a separate folder

Extract a component from a template

The Extract Angular component refactoring works by running ng generate component, taking schematic preferences inside your angular.json file into account.

  1. In an HTML template file, select the code fragment that you want to extract into an Angular component.

  2. From the context menu of the selection, choose Refactor | Extract Component.

    Alternatively, press Ctrl+Alt+Shift+T and select Extract Component from the Refactor This popup.

    Extract a component: Refactor This
  3. In the dialog that opens, specify the name of the new component.

Angular signals

With IntelliJ IDEA, you can easily create Angular signals straight from signal, computed, and effect templates.

Angular signals

Create signals

  1. Write the function you need. IntelliJ IDEA runs an inspection and highlights the new function as unresolved.

  2. Hover over the highlighted function and click the Create signal '<function name>' link in the popup.

    Create Angular signal: inspection popup

    Alternatively, place the cursor at the highlighted function, press Alt+Enter, and select Create signal '<function name>'.

    Create Angular signal: intention action
  3. IntelliJ IDEA brings you to the component TypeScript file where a stub of the new signal is generated. Fill in the placeholders as necessary.

Configure highlighting for Angular signals

  1. Press Ctrl+Alt+S to open settings and select Editor | Color Scheme | Angular Template.

  2. Select Signal in the list and click the color indication next to Foreground.

    Angular signal: configure highlighting
  3. Select the color you prefer and click Apply.

Navigate through an Angular application

When working on Angular projects you have to jump between different component files, such as TypeScript, template, and style files. To navigate around your code, you can use the following options:

Also, you can download the Angular CLI QuickSwitch plugin and install it on your computer.

  1. To call the Related Symbol popup with a list of related files, perform one of the following actions:

    • Press Ctrl+Alt+Home.

    • Select Navigate | Related Symbol from the main menu.

    • Right-click any area in the editor and select Go To | Related Symbol.

    In a TypeScript component file, the popup also lists all the symbols that were imported into this file.

    Navigating through an Angular app using the Related Symbol popup
  2. To open a file, select it and press Enter. Alternatively, use the numbers associated with each file type:

    1. The TypeScript file with the component class

    2. Template

    3. Tests

    4. Styles

Add new features with ng add

In projects that use Angular CLI 6 or later, you can use the Angular Dependency action to add new libraries. This action runs the ng add command which installs the dependency and updates the app with a special installation script. Note that not all libraries support installation with ng add.

  1. Select File | New from the main menu or press Alt+Insert in the Project tool window, and then select Angular Dependency.

  2. From the list, select the library to add. The list shows the libraries that can be definitely installed with ng add. To install a package that is not on the list, scroll to its end and double-click the Install package not listed above link, then specify the package name in the dialog that opens.

  3. Follow the steps of the wizard.

    The example below illustrates adding Angular Material to a project.

    Adding Angular Material to a project with ng add

If you manage dependencies manually through your package.json, IntelliJ IDEA still recognizes packages that support ng add. When you add such package to package.json, IntelliJ IDEA suggests installing it with ng add.

IntelliJ IDEA suggests adding a dependency with ng add

Generate code with Angular Schematics

IntelliJ IDEA can generate code using both schematics defined in libraries like @angular/material and those defined in Angular CLI itself.

  1. Select File | New from the main menu or press Alt+Insert in the Project tool window, and then select Angular Schematic.

  2. From the list, select the relevant schematic. Start typing the name of the schematics, the list shrinks as you type.

    Choosing Angular Schematic
  3. In the dialog that opens, specify the name of the schematic to be generated and additional options, if necessary. IntelliJ IDEA shows the description of the schematic and provides code completion and description for available options.

    Generating Angular CLI schematic: code completion and description is provided

View parameter hints

In Angular HTML templates, Parameter hints show the names of parameters in methods and functions to make your code easier to read. By default, parameter hints are shown only for values that are literals or function expressions but not for named objects.

Configure parameter hints

  1. Open the Settings dialog (Ctrl+Alt+S) and go to Editor | Inlay Hints.

  2. Expand Angular HTML template under Parameter names.

  3. Specify the context in which you want parameter hints shown by selecting the corresponding checkboxes.

    The preview shows how the changes you make in the settings affect the code appearance.

  4. For some methods and functions, IntelliJ IDEA does not show parameter hints in any context. Click Exclude list... to view these methods and functions, possibly enable parameter hints for them, or add new items to the list.

  5. To hide parameter hints for any value type in any context, clear the Angular HTML template checkbox under Parameter names.

Confgure parameter hints in Angular templates

Inspect your code

IntelliJ IDEA brings a number of Angular-specific inspections that help you find errors as you edit your code and suggest quick-fixes for them.

In the example below, both a template and a templateUrl properties are used. IntelliJ IDEA detects the error, warns you about it, and suggests a quick-fix.

Angular inspection: duplicate properties

Another example shows how IntelliJ IDEA warns you about incorrect use of the *ngIf and *ngFor structural directives.

Angular inspection: incorrect use of structural directive

Angular-specific inspections help you identify improper usage of standalone components. In the example below, IntelliJ IDEA detects an import statement for a component that is not standalone and suggests a wiock-fix for the problem.

A non-standalone is imported directly

You may find it handy to use quick-fixes for creating @Input and @Output properties from Angular component templates, both with or without a transform property. Note that the required import statements are also generated automatically.

Quick-fix to generate @Input and @Output properties

IntelliJ IDEA also provides context-aware Create Field and Create Method intention actions that help you generate properly declared fields.

View the list of Angular-specific inspections and configure them

  1. In the Settings dialog (Ctrl+Alt+S) , go to Editor | Inspections.

  2. Expand the Angular node.

  3. Configure inspection profiles and severity, disable and suppress predefined inspections, and create custom ones

    as described in Code inspections.

Use Angular Material Design components

IntelliJ IDEA recognizes Angular Material components and attributes and provides coding assistance for them:

  • Completion for components

    A list of suggested completion variants for an Angular component
  • Completion for attributes

    A list of suggested completion variants for an Angular attribute
  • Navigation between a component or an attribute and its declaration (press Ctrl+B or select Go To | Declaration from the context menu).

Install Angular Material

  • Open the embedded Terminal (Alt+F12) and type ng add @angular/material.

  • Add "@angular/material": "^16.2.11" under dependencies in your package.json and run npm install.

  • In the main menu, go to File | New | Angular Dependency, then select @angular/material from the list and follow the steps of the wizard that starts.

    AInstall Angualar Material

Learn more from Getting Started on the Angular Material official website.

Configure syntax highlighting

You can configure Angular-aware syntax highlighting according to your preferences and habits.

  1. In the Settings dialog (Ctrl+Alt+S) , go to Editor | Color Scheme | Angular Template.

  2. Select the color scheme, accept the highlighting settings inherited from the defaults or customize them as described in Colors and fonts.

Run an Angular application

  1. Сlick the Run icon in the gutter next to the start script in package.json, or run npm start in the Terminal Alt+F12, or double-click the start task in the npm tool window (View | Tool Windows | npm).

    Run an Angular app in the development mode from package.json
  2. Wait till the application is compiled and the development server is ready.

    The Run tool window or the Terminal shows the URL at which your application is running. If your application was generated with @angular/cli, the default URL is http://localhost:4200/. Click this link to view the application.

    Running Angular CLI app: the Development server is ready

Run an Angular application via a run/debug configuration

For applications created with Angular CLI in the IntelliJ IDEA New Project wizard as described above, IntelliJ IDEA generates an npm configuration with the default name Angular CLI Server. This configuration runs the ng serve command that launches the development server and starts your application in the development mode.

In other cases, you need to create a run/debug configuration with the actual settings, such as, host, port, etc., manually.

Create an npm run/debug configuration

  1. Go to Run | Edit Configurations. Alternatively, select Edit Configurations from the list on the toolbar.

    Open the Edit Configurations dialog

    In the Edit Configurations dialog that opens, click the Add button (the Add button) on the toolbar and select npm from the list.

  2. In the Configuration tab of the Run/Debug Configurations: npm dialog that opens, specify the location of the package.json, the Node.js interpreter, and the package manager to use.

    In the Command field, select run from the list and then select the script to run from the Scripts list. Most likely it will be the default start script but you can configure another one in your package.json, for example, to run the application on a custom port.

    npm run/debug configuration
  3. Optionally:

    To open the application in the browser, update the configuration as follows: in the Browser / Live Edit tab, select the After launch checkbox, select the browser to open the application in, and specify the URL address at which the application wil run.

    If you are going to debug the application, select Google Chrome or another Chromium-based browser.

    Browser / Live Edit tab: select browser

Run an application

  1. From the list in the Run widget on the toolbar, select a run configuration of the type npm. This can be the autogenerated Angular CLI Server configuration or a custom one that you created yourself as described above.

  2. Click Run.

    Run a Vue.js app in the development mode via a run/debug configuration
  3. Wait till the application is compiled and the development server is ready.

    The Run tool window or the Terminal shows the URL at which your application is running. If your application was generated with @angular/cli, the default URL is http://localhost:4200/. Click this link to view the application.

    Running Angular CLI app: the Development server is ready

    Alternatively, enable IntelliJ IDEA to open the application on start as described above.

Debug an Angular application

You can start a debugging session either by launching a run/debug configuration or from the Run tool window that shows the URL at which your application is running in the development mode.

Start debugging via a run/debug configuration

To debug your Angular application you need two run/debug configurations:

  • An npm configuration to start your application in the development mode, as described above.

  • A JavaScript Debug configuration to attach the debugger to the application that is running in the development mode.

You can create a JavaScript Debug configuration within the npm configuration to launch them at once, as described in Run and debug an Angular application with an npm run/debug configuration.

Alternatively, launch an npm and a JavaScript Debug run/debug configurations separately, as described in Start debugging with a JavaScript Debug run/debug configuration.

Run and debug an Angular application with a single npm run/debug configuration

  1. Set the breakpoints in your code.

  2. Create an npm configuration as described above.

  3. In the Configuration tab of the Run/Debug Configurations: npm dialog that opens, specify the location of the package.json, the Node.js interpreter, and the package manager to use.

    In the Command field, select run from the list and then select the script to run from the Scripts list. Most likely it will be the default start script but you can configure another one in your package.json, for example, to run the application on a custom port.

    npm run/debug configuration
  4. In the Browser / Live Edit tab, select the After launch checkbox, select Google Chrome or another Chromium-based browser from the list, select the with JavaScript debugger checkbox, and then specify the URL at which your application will run.

    npm configuration, Browser tab
  5. Click Run.

    To re-run the configuration, select it from the list in the Run widget and click Run next to it.

    IntelliJ IDEA runs the application in the development mode and at the same time launches a debugging session.

    Debugging session
  6. When the first breakpoint is hit, switch to the Debug tool window and proceed as usual: step through the program, stop and resume program execution, examine it when suspended, explore the call stack and variables, set watches, evaluate variables, view actual HTML DOM, and so on.

Start debugging with a JavaScript Debug run/debug configuration

  1. Set the breakpoints in your code.

  2. Start the application in the development mode as described above and wait till the application is compiled and the development server is ready.

    The Run tool window or the Terminal shows the URL at which your application is running. Copy this URL to specify it later in the JavaScript Debug configuration.

    Angular app is running in the development mode
  3. Create a JavaScript Debug configuration. To do that, go to Run | Edit Configurations in the main menu, click the Add icon, and select Javascript Debug from the list.

    If you generated your application with Angular CLI, as described above, IntelliJ IDEA has already created a JavaScript Debug run/debug configuration with the default name Debug Application and the default URL http://localhost:4200. Select this run/debug configuration from the list under the JavaScript Debug node.

    Select the generated JavaScript debug run/debug configuration
  4. In the Run/Debug Configurations: JavaScript Debug dialog that opens, specify the name of the configuration and the URL address at which the application is running in the development mode. You can copy this URL in the Run tool window or in the Terminal, as described above.

    Create a JavaScript Debug configuration: specify the URL
  5. Click Debug.

    To re-run the configuration, select it from the list in the Run widget and click Debug next to it.

    Run a JavaScript Debug configuration from the Run widget
  6. When the first breakpoint is hit, switch to the Debug tool window and proceed as usual: step through the program, stop and resume program execution, examine it when suspended, explore the call stack and variables, set watches, evaluate variables, view actual HTML DOM, and so on.

Start debugging from the Run tool window or from the built-in Terminal

If your application is running in the development mode on localhost, in particular, if it was generated with Angular CLI, you can launch a debugging session right from the >Run tool window or from the built-in Terminal.

  1. Set the breakpoints in your code.

  2. Start the application in the development mode as described above and wait till the application is compiled and the development server is ready.

  3. The Run tool window or the Terminal shows the URL at which your application is running. If your application was generated with @angular/cli, the default URL is http://localhost:4200/. Hold Ctrl+Shift and click this URL link. IntelliJ IDEA starts a debugging session with an automatically generated Angular Application configuration of the type JavaScript Debug.

    Starting a debugging session from the Run tool window

    Alternatively, select the autogenerated Angular Application configuration from the list and click the Debug button the Debug button next to the list.

When the first breakpoint is hit, switch to the Debug tool window and proceed as usual: step through the program, stop and resume program execution, examine it when suspended, explore the call stack and variables, set watches, evaluate variables, view actual HTML DOM, and so on.

Troubleshooting for Node.js 17+

If you are using Node.js version 17 or later, during a debugging session you may face network connectivity issues that result in problems with attaching the debugger or with loading sourcemaps.

The workaround is to pass --host 127.0.0.1 to the server by updating the start script in your package.json as follows:

"start": "ng serve --host=127.0.0.1"

Use several frameworks within a project

Sometimes you may need to use other frameworks within one Angular project.

To get context-aware coding assistance in each file, create a configuration file .ws-context and specify which framework should be used in each particular file or folder. The settings from this file will override the default configuration.

  1. In the project root, select New | File from the context menu and specify .ws-context as the file name.

  2. In .ws-context, use two types of properties:

    • <context-name> with the context value string

    • A GLOB pattern with a context details object

  3. Use the following context values:

    • framework: vue, angular, react, svelte, astro

    • angular-template-syntax: V_2, V_17

    • nextjs-project: nextjs

    • astro-project: astro

    • vue-store: vuex, pinia

    • vue-class-component-library: vue-class-component, vue -property-decorator, vue-facing-decorator

    • jsdoc-dialect: jsdoc-typescript, jsdoc-closure

  4. Use path nesting for simplicity.

    • The last segment of a GLOB path is the file name pattern, it only supports the * wildcard.

    • If the last segment is a ** it matches all nested directories and files.

    • Top level context properties should have the /** pattern.

  5. When several patterns match the same file name, the following rules are used for disambiguation:

    • Choose the pattern with maximum number of path segments, excluding ** segments.

    • Choose the pattern that is a pure file name pattern, which means that it does not end in ** or /.

    • Choose the pattern that was defined first.

Example

Suppose you have a project with a number of frameworks used in various folders.

A project with different frameworks

To get context-aware assistance for each file in the project, add the following code to .ws-context:

{ "framework": "vue", "angular-template-syntax": "V_2", "src/**/app/**": { "framework": null, "app.component.html" : { "framework": "angular", "angular-template-syntax": "V_17" } }, "src/**/p*-editor/*.html" : { "framework" : "angular" } }
Last modified: 26 May 2024