This repository contains a plugin to provide additional rules for Deno's linter.

To use it, add it to the "lint" section in your own project's deno.json or deno.jsonc configuration file:

{
  "lint": {
    "plugins": ["jsr:@duncan/lint"]
  }
}

Rules

no-useless-undefined-initializer

Because let declarations are initialized to undefined by default, it's unnecessary to provide undefined as an initializer.^1 ^2

This rule warns about such initializers, e.g.

// Bad
let x = undefined;
let y: string | undefined = undefined;

// Good
let x;
let y: string | undefined;

...and an automated Quick-Fix is offered via LSP: