unicorn/no-useless-collection-argument Style

💡 A suggestion is available for this rule.

Disallow useless values or fallbacks in Set, Map, WeakSet, or WeakMap.

It is unnecessary to pass an empty array or empty string when constructing a Set, Map, WeakSet, or WeakMap, since they accept nullish values.

It is also unnecessary to provide a fallback for possible nullish values.

Examples of incorrect code for this rule:

const set = new Set([]);
const set = new Set("");

Examples of correct code for this rule:

const set = new Set();

Examples of incorrect code for this rule:

const set = new Set(foo ?? []);
const set = new Set(foo ?? "");

Examples of correct code for this rule:

const set = new Set(foo);

How to use

To enable this rule using the config file or in the CLI, you can use:

Config (.oxlintrc.json)Config (oxlint.config.ts)CLI

json

{
  "rules": {
    "unicorn/no-useless-collection-argument": "error"
  }
}

import { defineConfig } from "oxlint";

export default defineConfig({
  rules: {
    "unicorn/no-useless-collection-argument": "error",
  },
});

bash

oxlint --deny unicorn/no-useless-collection-argument

This rule was added in v1.28.0.