Is it possible for VSCode to automatically generate callback method scaffolding for TypeScript?

When working in VS + C#, typing += to an event automatically generates the event handler method scaffolding with the correct argument/return types. In TypeScript, is it possible for VS Code to offer similar functionality?

For instance, take a look at the code snippet below:

import * as http from 'http';

http.createServer

While VS Code displays the callback type in a pop-up and provides detailed information if we press F12 to navigate to definitions, inserting onReq and selecting "Ctrl+.:Add missing method declaration" results in the following placeholder:

function onReq(onReq: any)
{
  throw new Error('Function not implemented.');
}

This generic insertion seems ineffective. Wouldn't it be more helpful if it added something like this instead?

function onReq(req: http.IncomingMessage, res: http.ServerResponse)
{
  throw new Error('Function not implemented.');
}

Is there a specific step I missed, or is it that despite having all the necessary information, VS Code cannot provide accurate scaffolding?

https://i.stack.imgur.com/J1ZPh.png

https://i.stack.imgur.com/jIp1q.png

https://i.stack.imgur.com/VLw5E.png

Answer №1

Understanding IDE versus Code Editor

To enhance the capabilities of vscode in interpreting your code, it's important to differentiate between an IDE and a code editor.

Customize Your Snippets

Create a .vscode Directory

For advanced customization, create a new directory at the root of your project named .vscode.

Your file structure will look something like this:

.vscode
node_modules
public
src

In the newly created directory, add a file named

whatever-name-you-want.code-snippets
, for example, react.code-snippets.

.vscode
 - react.code-snippets
node_modules
public
src

Open the new file and paste the following snippet configuration:

{
    // Customize your workspace snippets here.
    "Print to console": {
        "prefix": "log",
        "body": [
            "console.log('$1');",
            "$2"
        ],
        "description": "Log output to console"
     },
     "onReq": {
        "prefix": "onreq",
        "body": [
            "function onReq(req: http.IncomingMessage, res: http.ServerResponse) {",
            "\tthrow new Error('Function not implemented.');",
            "}"
        ]
     }
}

You can add as many custom snippets as you prefer.

Utilizing DefinitelyTyped

The Typescript community provides numerous libraries with pre-defined types.

Discover Packages

Explore the available packages at https://github.com/DefinitelyTyped/DefinitelyTyped/tree/master/types

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