Visual Studio Code: Disabling unused callback function parameters causes issues in the code

Question

Visual Studio Code: Disabling unused callback function parameters causes issues in the code

Exploring Visual Studio Code Features

Working on my TypeScript project in Visual Studio Code has been a great experience, especially with the helpful IDE features like suggested variable names, imports, and unused variables.

However, I've noticed a unique issue when cleaning up my code by removing unused imports - it also ends up removing unused parameters in callback functions, causing some unexpected changes.

For instance, when working with Express controller functions and wanting to fetch something without any filters, this issue becomes apparent:

function getAllItems(req: Request, res: Response)

Removing the unused parameter req can lead to a mismatch in the function signature:

function getAllItems(res: Response)

This alteration may not align with the callback function requirements.

Exploration and Solutions

I discovered the "noUnusedParameters": true option in TypeScript's tsconfig.json, but I am looking for a solution that preserves unused parameters, especially in non-callback functions.

Seeking a Solution

Is there a way to customize Visual Studio Code's behavior to retain unused parameters that are not in the last position, regardless of whether they are used or not?

javascript typescript visual-studio-code tslint

Answer 1

Answer №1

Although it is true that the unused parameter error message is accurate, it may not always be appropriate to simply remove the parameter, especially if it is not the last parameter in the function.

Depending on how you are using the function and the type definitions for express, it is important to note that a version with fewer parameters may not always be compatible with where the original version was used.

function test(a: number, b: string) { console.log(b )}
let expected : (a: number, b: string) => void = test; // original version is acceptable


function test(b: string) { console.log(b )}
let expected : (a: number, b: string) => void = test; // the version without the first parameter is not valid in this context

If you want to retain unused parameters without encountering compilation errors with noUnusedParameters, you can use _ as the parameter name (or __ or ___ if necessary)

Answer 2

Although it is true that the unused parameter error message is accurate, it may not always be appropriate to simply remove the parameter, especially if it is not the last parameter in the function.

Depending on how you are using the function and the type definitions for express, it is important to note that a version with fewer parameters may not always be compatible with where the original version was used.

function test(a: number, b: string) { console.log(b )}
let expected : (a: number, b: string) => void = test; // original version is acceptable


function test(b: string) { console.log(b )}
let expected : (a: number, b: string) => void = test; // the version without the first parameter is not valid in this context

If you want to retain unused parameters without encountering compilation errors with noUnusedParameters, you can use _ as the parameter name (or __ or ___ if necessary)

Visual Studio Code: Disabling unused callback function parameters causes issues in the code

Exploring Visual Studio Code Features

Exploration and Solutions

Seeking a Solution

Answer №1

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