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When type inference does not provide the desired information, type information may be provided explicitly with JSDoc annotations. This document describes the JSDoc annotations currently supported.
Typings and Automatic Type Acquisition
Many popular libraries ship with typings files so you get IntelliSense for them automatically. For libraries that do not include typings, VS Code's
Automatic Type Acquisition will automatically install community maintained typings file for you.
Automatic type acquisition requires npmjs, the Node.js package manager, which is included with the Node.js runtime. In this image you can see IntelliSense, including the method signature, parameter info, and the method's documentation for the popular lodash library.
Type declaration files are automatically downloaded and managed by Visual Studio Code for packages listed in your project's
You can alternately explicitly list packages to acquire type declaration files for in a jsconfig.json.
Fixing npm not installed warning for Automatic Type Acquisition
Automatic Type Acquisition uses npm, the Node.js package manager, to install and manage Type Declaration (typings) files. To ensure that Automatic Type Acquisition works properly, first ensure that you have npm installed on your machine.
npm --version from a terminal or command prompt to quickly check that npm is installed and available.
npm is installed with the Node.js runtime, which is available for download from Nodejs.org. Install the current LTS (Long Term Support) version and the npm executable will be added by default to your system path.
If you have npm installed but still see a warning message, you can explicitly tell VS Code where npm is installed with the
typescript.npmsetting. This should be set to the full path of the npm executable on your machine, and this does not have to match the version of npm you are using to manage packages in your workspace.
typescript.npm requires TypeScript 2.3.4+.
For example, on Windows, you would add a path like this to your
jsconfig.json file is not required, however, there are situations when you will want to add a
- Your workspace contains more than one project context. In this situation, you should add a
jsconfig.jsonfile at the root folder for each project.
Location of jsconfig.json
In more complex projects, you may have more than one
jsconfig.json file defined inside a workspace. You will want to do this so that the source code in one project does not appear in the IntelliSense of another project.
Illustrated below is a project with a
Below is a simple template for
target to be
ES6 and the
exclude attribute excludes the
node_modules folder. You can copy and paste this code into your
exclude attribute tells the language service which files are not part of your source code. If IntelliSense is slow, add folders to your
exclude list (VS Code will prompt you to do this if it detects slow completions). You will want to
exclude files generated by a build process (such as a
dist directory). These files will cause suggestions to show up twice and will slow down IntelliSense.
You can explicitly set the files in your project using the
include attribute. If no
include attribute is present, then this defaults to including all files in the containing directory and subdirectories. When a
include attribute is specified, only those files are included.
Here is an example with an explicit
The best practice, and least error prone route, is to use the
include attribute with a single
src folder. Note that file paths in
include are relative to the location of
For more information, see the full jsconfig.json documentation.
Migrating to TypeScript
jsconfig.json file to
tsconfig.json and set the
allowJs property to
jsconfig.json is the same as a
tsconfig.json file, only with
allowJs set to true. See the documentation for
tsconfig.json here to see other available options.
TypeScript can infer types in
.js files same as in
You can get started with type checking a few different ways depending on your needs.
// @ts-check to the top of a file.
// @ts-check is a good approach if you just want to try type checking in a few files but not yet enable it for an entire codebase.
Using a setting
You can opt individual files out of type checking with a
// @ts-nocheck comment at the top of the file:
// @ts-ignore comment on the line before the error:
Using jsconfig or tsconfig
'checkJs': true to the project's compiler options:
// @ts-nocheck to disable type checking per file.
.js/.ts file open in the editor to run this command. If you open a TypeScript file, the version appears in the lower right corner.
Global variables and type checking
If you try to use
// @ts-check with the above code, you'll see a number of errors about the use of global variables:
Property 'webkitNotifications' does not exist on type 'Window'.
Cannot find name 'CAN_NOTIFY'.
Property 'webkitNotifications' does not exist on type 'Window'.
If you want to continue using
// @ts-check but are confident that these are not actual issues with your application, you have to let TypeScript know about these global variables.
To start, create a
jsconfig.json at the root of your project:
Then reload VS Code to make sure the change is applied. The presence of a
Now create a
globals.d.ts file somewhere your workspace:
d.ts files are type declarations. In this case,
globals.d.ts lets TypeScript know that a global
CAN_NOTIFY exists and that a
webkitNotifications property exists on
window. You can read more about writing
d.ts in the TypeScript documentation.
Using the TypeScript compiler
The TypeScript compiler
jsconfig.json with the desired options and then use the –p argument to make
tsc use your
jsconfig.json file, for example
tsc -p jsconfig.json to down-level compile.
Read more about the compiler options for down level compilation in the jsconfig documentation.
tasks.json file (located under the workspace's
.vscode folder). The
group setting makes this task the default Task: Run Build Task gesture.
isBackground tells VS Code to keep running this task in the background. To learn more, go to Tasks.
Once you have added this, you can start Babel with the ⇧⌘B (Windows, Linux Ctrl+Shift+B) (Run Build Task) command and it will compile all files from the
src directory into the
Tip: For help with Babel CLI, see the instructions in Using Babel. The example above uses the CLI option.