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JavaScript in Visual Studio Lawmaking

Visual Studio Code includes built-in JavaScript IntelliSense, debugging, formatting, lawmaking navigation, refactorings, and many other avant-garde language features.

Most of these features just piece of work out of the box, while some may require basic configuration to get the all-time feel. This page summarizes the JavaScript features that VS Code ships with. Extensions from the VS Code Marketplace tin augment or change well-nigh of these built-in features. For a more in-depth guide on how these features piece of work and can be configured, see Working with JavaScript.

IntelliSense

IntelliSense shows you intelligent lawmaking completion, hover info, and signature information and then that you lot tin write code more rapidly and correctly.

VS Code provides IntelliSense within your JavaScript projects; for many npm libraries such equally
React,
lodash, and
express; and for other platforms such as
node, serverless, or IoT.

Encounter Working with JavaScript for data about VS Lawmaking’south JavaScript IntelliSense, how to configure it, and help troubleshooting common IntelliSense problems.

JavaScript projects (jsconfig.json)

A jsconfig.json file defines a JavaScript project in VS Code. While
jsconfig.json
files are non required, yous will desire to create i in cases such as:

  • If not all JavaScript files in your workspace should be considered part of a single JavaScript projection.
    jsconfig.json
    files let yous exclude some files from showing up in IntelliSense.
  • To ensure that a subset of JavaScript files in your workspace is treated equally a single project. This is useful if you are working with legacy code that uses implicit globals dependencies instead of
    imports
    for dependencies.
  • If your workspace contains more than one project context, such as front-stop and dorsum-end JavaScript code. For multi-projection workspaces, create a
    jsconfig.json
    at the root folder of each project.
  • You are using the TypeScript compiler to down-level compile JavaScript source lawmaking.

To define a basic JavaScript project, add a
jsconfig.json
at the root of your workspace:

        
          {
          
          
          "compilerOptions"
          : {
          
          
          "module"
          :
          
          "commonjs"
          ,
          
          
          "target"
          :
          
          "es6"
          
            },
          
          
          "exclude"
          : [
          "node_modules"
          ]
          }
        
      

See Working with JavaScript for more advanced
jsconfig.json
configuration.

Tip:
To check if a JavaScript file is office of JavaScript projection, but open up the file in VS Lawmaking and run the
JavaScript: Go to Project Configuration
command. This control opens the
jsconfig.json
that references the JavaScript file. A notification is shown if the file is not part of any
jsconfig.json
project.

Snippets

VS Code includes basic JavaScript snippets that are suggested every bit you type;

There are many extensions that provide additional snippets, including snippets for popular frameworks such every bit Redux or Angular. You tin even define your own snippets.

Tip: To disable snippets suggestions, set
editor.snippetSuggestions
to
"none"
in your settings file. The
editor.snippetSuggestions
setting also lets you change where snippets appear in the suggestions: at the summit ("summit"), at the bottom ("lesser"), or inlined ordered alphabetically ("inline"). The default is
"inline".

JSDoc back up

VS Code understands many standard JSDoc annotations, and uses these annotations to provide rich IntelliSense. Y’all can optionally even apply the type data from JSDoc comments to type check your JavaScript.

Chop-chop create JSDoc comments for functions by typing
/**
before the office annunciation, and select the
JSDoc annotate
snippet proposition:

To disable JSDoc comment suggestions, set up
"javascript.propose.completeJSDocs": false.

Hover Data

Hover over a JavaScript symbol to quickly see its type information and relevant documentation.

Hovering over a JavaScript variable to see its type information

The

⌘Chiliad ⌘I
(Windows, Linux
Ctrl+K Ctrl+I)

keyboard shortcut shows this hover info at the current cursor position.

Signature Help

As you write JavaScript function calls, VS Lawmaking shows data near the part signature and highlights the parameter that you are currently completing:

Signature help for some DOM methods

Signature help is shown automatically when you type a
(
or
,
within a role phone call. Press

⇧⌘Space
(Windows, Linux
Ctrl+Shift+Space)

to manually trigger signature help.

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Auto imports

Automatic imports speed upward coding by suggesting available variables throughout your project and its dependencies. When y’all select one of these suggestions, VS Lawmaking automatically adds an import for it to the top of the file.

Only first typing to come across suggestions for all available JavaScript symbols in your electric current project. Auto import suggestions show where they will be imported from:

Global symbols are shown in the suggestion list

If you choose 1 of these motorcar import suggestions, VS Code adds an import for it.

In this example, VS Lawmaking adds an import for
Button
from material-ui to the top of the file:

After selecting a symbol from a different file, an import is added for it automatically

To disable auto imports, set
"javascript.propose.autoImports"
to
imitation.

Tip:
VS Lawmaking tries to infer the all-time import fashion to use. You tin explicitly configure the preferred quote way and path style for imports added to your code with the
javascript.preferences.quoteStyle
and
javascript.preferences.importModuleSpecifier
settings.

Formatting

VS Lawmaking’s congenital-in JavaScript formatter provides basic lawmaking formatting with reasonable defaults.

The
javascript.format.*
settings configure the built-in formatter. Or, if the built-in formatter is getting in the way, gear up
"javascript.format.enable"
to
imitation
to disable it.

For more specialized code formatting styles, try installing one of the JavaScript formatting extensions from the Marketplace.

All of VS Code’s JavaScript features likewise work with JSX:

JSX IntelliSense

You can use JSX syntax in both normal
*.js
files and in
*.jsx
files.

VS Code likewise includes JSX-specific features such as autoclosing of JSX tags:

Set
"javascript.autoClosingTags"
to
false
to disable JSX tag closing.

Code navigation

Code navigation lets y’all speedily navigate JavaScript projects.

  • Go To Definition

    F12

    – Go to the source lawmaking of a symbol definition.
  • Peek Definition

    ⌥F12
    (Windows
    Alt+F12, Linux
    Ctrl+Shift+F10)

    – Bring upward a Peek window that shows the definition of a symbol.
  • Go to References

    ⇧F12
    (Windows, Linux
    Shift+F12)

    – Show all references to a symbol.
  • Get to Type Definition

    – Go to the type that defines a symbol. For an example of a grade, this will reveal the grade itself instead of where the instance is divers.

You can navigate via symbol search using the
Get to Symbol
commands from the
Command Palette
(
⇧⌘P
(Windows, Linux
Ctrl+Shift+P)
).

  • Become to Symbol in File

    ⇧⌘O
    (Windows, Linux
    Ctrl+Shift+O)
  • Become to Symbol in Workspace

    ⌘T
    (Windows, Linux
    Ctrl+T)

Rename

Press

F2

to rename the symbol nether the cursor across your JavaScript projection:

Renaming a variable

Refactoring

VS Code includes some handy refactorings for JavaScript such every bit
Extract part
and
Extract constant. Merely select the source code you’d like to excerpt and then click on the lightbulb in the gutter or press (
⌘.
(Windows, Linux
Ctrl+.)
) to run across bachelor refactorings.

JavaScript refactoring

Available refactorings include:

  • Extract to method or function.
  • Extract to constant.
  • Convert betwixt named imports and namespace imports.
  • Movement to new file.

See Refactorings for more information about refactorings and how you can configure keyboard shortcuts for individual refactorings.

Unused variables and unreachable lawmaking

Unused JavaScript code, such the else cake of an
if
statement that is always true or an unreferenced import, is faded out in the editor:

Unreachable source code faded out

Yous can quickly remove this unused code past placing the cursor on information technology and triggering the Quick Fix command (
⌘.
(Windows, Linux
Ctrl+.)
) or clicking on the lightbulb.

To disable fading out of unused code, set
"editor.showUnused"
to
false. You tin also disable fading of unused code simply in JavaScript by setting:

        
          "[javascript]"
          : {
          
          
          "editor.showUnused"
          :
          
          false
          },
          "[javascriptreact]"
          : {
          
          
          "editor.showUnused"
          :
          
          false
          },
        
      

Organize Imports

The
Organize Imports
Source Activeness sorts the imports in a JavaScript file and removes any unused imports:


You can run
Organize Imports
from the
Source Activeness
context menu or with the

⇧⌥O
(Windows, Linux
Shift+Alt+O)

keyboard shortcut.

Organize imports can too be washed automatically when y’all salvage a JavaScript file by setting:

        
          "editor.codeActionsOnSave"
          : {
          
          
          "source.organizeImports"
          :
          
          true
          }
        
      

Code Actions on Relieve

The
editor.codeActionsOnSave
setting lets you configure a set of Code Actions that are run when a file is saved. For example, you can enable organize imports on save by setting:

        
          // On save, run both fixAll and organizeImports source actions
          "editor.codeActionsOnSave"
          : {
          
          
          "source.fixAll"
          :
          
          true
          ,
          
          
          "source.organizeImports"
          :
          
          true
          ,
          }
        
      

You can also set
editor.codeActionsOnSave
to an assortment of Code Actions to execute in social club.

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Here are some source actions:

  • "organizeImports"
    – Enables organize imports on save.
  • "fixAll"
    – Auto Ready on Save computes all possible fixes in one round (for all providers including ESLint).
  • "fixAll.eslint"
    – Car Fix just for ESLint.
  • "addMissingImports"
    – Adds all missing imports on save.

See Node.js/JavaScript for more than data.

Lawmaking suggestions

VS Code automatically suggests some common lawmaking simplifications such as converting a concatenation of
.then
calls on a hope to use
async
and
await

Set
"javascript.suggestionActions.enabled"
to
false
to disable suggestions.

Inlay hints

Inlay hints add additional inline information to source lawmaking to help you sympathise what the code does.

Parameter name inlay hints
bear witness the names of parameters in function calls:

Parameter name inlay hints

This can help you understand the meaning of each argument at a glance, which is peculiarly helpful for functions that accept Boolean flags or accept parameters that are easy to mix up.

To enable parameter name hints, gear up
javascript.inlayHints.parameterNames. There are 3 possible values:

  • none
    — Disable parameter inlay hints.
  • literals
    — Just show inlay hints for literals (cord, number, Boolean).
  • all
    — Evidence inlay hints for all arguments.

Variable type inlay hints
evidence the types of variables that don’t accept explicit type annotations.

Setting:
javascript.inlayHints.variableTypes.enabled

Variable type inlay hints

Holding type inlay hints
show the type of class backdrop that don’t take an explicit blazon annotation.

Setting:
javascript.inlayHints.propertyDeclarationTypes.enabled

Property type inlay hints

Parameter blazon hints
evidence the types of implicitly typed parameters.

Setting:
javascript.inlayHints.parameterTypes.enabled

Parameter type inlay hints

Return type inlay hints
bear witness the render types of functions that don’t accept an explicit type annotation.

Setting:
javascript.inlayHints.functionLikeReturnTypes.enabled

Return type inlay hints

References CodeLens

The JavaScript references CodeLens displays an inline count of reference for classes, methods, backdrop, and exported objects:

JavaScript references CodeLens

To enable the references CodeLens, set
"javascript.referencesCodeLens.enabled"
to
true.

Click on the reference count to speedily browse a list of references:

JavaScript references CodeLens peek

Update imports on file move

When you move or rename a file that is imported by other files in your JavaScript projection, VS Code can automatically update all import paths that reference the moved file:

The
javascript.updateImportsOnFileMove.enabled
setting controls this behavior. Valid settings values are:

  • "prompt"
    – The default. Asks if paths should exist updated for each file motion.
  • "always"
    – Ever automatically update paths.
  • "never"
    – Practise non update paths automatically and do non prompt.

Linters

Linters provides warnings for suspicious looking lawmaking. While VS Lawmaking does not include a built-in JavaScript linter, many JavaScript linter extensions available in the marketplace.

Tip:
This list is dynamically queried from the VS Lawmaking Market place. Read the description and reviews to decide if the extension is right for you.

Type checking

You tin can leverage some of TypeScript’s avant-garde blazon checking and error reporting functionality in regular JavaScript files likewise. This is a great way to grab common programming mistakes. These blazon checks also enable some heady Quick Fixes for JavaScript, including
Add together missing import
and
Add missing holding.

Using type checking and Quick Fixes in a JavaScript file

TypeScript tried to infer types in
.js
files the same manner information technology does in
.ts
files. When types cannot be inferred, they can be specified explicitly with JSDoc comments. Y’all tin can read more near how TypeScript uses JSDoc for JavaScript type checking in Working with JavaScript.

Type checking of JavaScript is optional and opt-in. Existing JavaScript validation tools such every bit ESLint can be used alongside born type checking functionality.

Debugging

VS Code comes with great debugging support for JavaScript. Fix breakpoints, inspect objects, navigate the call stack, and execute code in the Debug Panel. See the Debugging topic to learn more than.

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Debug customer side

You can debug your client-side code using a browser debugger such as our congenital-in debugger for Edge and Chrome, or the Debugger for Firefox.

Debug server side

Debug Node.js in VS Lawmaking using the born debugger. Setup is like shooting fish in a barrel and there is a Node.js debugging tutorial to help you.

debug data inspection

VS Code ships with excellent support for JavaScript only you lot can additionally install debuggers, snippets, linters, and other JavaScript tools through extensions.

Tip:
The extensions shown to a higher place are dynamically queried. Click on an extension tile above to read the description and reviews to decide which extension is best for yous. Run across more than in the Marketplace.

Side by side steps

Read on to find out about:

  • Working with JavaScript – More detailed information about VS Code’s JavaScript support and how to troubleshoot common bug.
  • jsconfig.json – Detailed description of the
    jsconfig.json
    project file.
  • IntelliSense – Learn more than almost IntelliSense and how to employ it finer for your language.
  • Debugging – Learn how to prepare debugging for your application.
  • Node.js – A walkthrough to create an Limited Node.js application.
  • TypeScript – VS Code has great support for TypeScript, which brings construction and strong typing to your JavaScript code.

Common questions

Does VS Code support JSX and React Native?

VS Code supports
JSX
and
React Native. You lot will get IntelliSense for
React/JSX
and
React Native
from automatically downloaded type declaration (typings) files from the npmjs type declaration file repository. Additionally, yous can install the pop React Native extension from the Marketplace.

To enable ES6 import statements for
React Native, y’all need to set the
allowSyntheticDefaultImports
compiler option to
true. This tells the compiler to create constructed default members and you lot get IntelliSense.
React Native
uses
Babel
behind the scenes to create the proper run-time code with default members. If y’all also desire to exercise debugging of
React Native
code, you lot can install the React Native Extension.

Does VS Code support the Dart programming language and the Palpitate framework?

Yes, there are VS Code extensions for both Dart and Flutter development. You tin can learn more at the Flutter.dev documentation.

IntelliSense is not working for external libraries

Automatic Blazon Acquisition
works for dependencies downloaded by npm (specified in
bundle.json), Bower (specified in
bower.json), and for many of the almost common libraries listed in your folder structure (for example
jquery-3.1.1.min.js).

ES6 Style imports are not working.

When you want to use ES6 mode imports but some blazon declaration (typings) files do not nevertheless use ES6 way exports, then set the TypeScript compiler option
allowSyntheticDefaultImports
to truthful.

        
          {
          
          
          "compilerOptions"
          : {
          
          
          "module"
          :
          
          "commonjs"
          ,
          
          
          "target"
          :
          
          "es6"
          ,
          
          
          // This is the line you want to add
          
          
          "allowSyntheticDefaultImports"
          :
          
          true
          
            },
          
          
          "exclude"
          : [
          "node_modules"
          ,
          
          "**/node_modules/*"
          ]
          }
        
      

Can I debug minified/uglified JavaScript?

Yes, you tin. You can see this working using JavaScript source maps in the Node.js Debugging topic.

How do I disable Syntax Validation when using not-ES6 constructs?

Some users want to use syntax constructs similar the proposed pipeline (|>) operator. However, these are currently not supported by VS Code’s JavaScript linguistic communication service and are flagged equally errors. For users who all the same desire to apply these future features, we provide the
javascript.validate.enable
setting.

With
javascript.validate.enable: false, y’all disable all congenital-in syntax checking. If you do this, nosotros recommend that yous utilize a linter similar ESLint to validate your source code.

Can I utilise other JavaScript tools like Menstruum?

Aye, only some of Menses’s linguistic communication features such every bit type and error checking may interfere with VS Code’s built-in JavaScript support. To acquire how to disable VS Code’s built-in JavaScript support, see Disable JavaScript support.

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Source: https://code.visualstudio.com/docs/languages/javascript