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noUnusedFunctionParameters

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Diagnostic Category: lint/correctness/noUnusedFunctionParameters

Since: v1.8.0

Disallow unused function parameters.

There is an exception to this rule: parameters that starts with underscore, e.g. function foo(_a, _b) {}.

function foo(myVar) {
console.log('foo');
}
code-block.js:1:14 lint/correctness/noUnusedFunctionParameters  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━

This parameter is unused.

> 1 │ function foo(myVar) {
^^^^^
2 │ console.log(‘foo’);
3 │ }

Unused parameters might be the result of an incomplete refactoring.

Unsafe fix: If this is intentional, prepend myVar with an underscore.

1 - function·foo(myVar)·{
1+ function·foo(_myVar)·{
2 2 console.log(‘foo’);
3 3 }

new Promise((accept, reject) => {
window.setTimeout(accept, 1000);
});
code-block.js:1:22 lint/correctness/noUnusedFunctionParameters  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━

This parameter is unused.

> 1 │ new Promise((accept, reject) => {
^^^^^^
2 │ window.setTimeout(accept, 1000);
3 │ });

Unused parameters might be the result of an incomplete refactoring.

Unsafe fix: If this is intentional, prepend reject with an underscore.

1 - new·Promise((accept,·reject)·=>·{
1+ new·Promise((accept,·_reject)·=>·{
2 2 window.setTimeout(accept, 1000);
3 3 });

const squares = [[1, 1], [2, 4], [3, 9], [4, 16]];
squares.filter(([k, v]) => v > 5);
code-block.js:2:18 lint/correctness/noUnusedFunctionParameters  FIXABLE  ━━━━━━━━━━━━━━━━━━━━━━━━━━━

This parameter is unused.

1 │ const squares = [[1, 1], [2, 4], [3, 9], [4, 16]];
> 2 │ squares.filter(([k, v]) => v > 5);
^
3 │

Unused parameters might be the result of an incomplete refactoring.

Unsafe fix: If this is intentional, prepend k with an underscore.

1 1 const squares = [[1, 1], [2, 4], [3, 9], [4, 16]];
2 - squares.filter(([k,·v])·=>·v·>·5);
2+ squares.filter(([_k,·v])·=>·v·>·5);
3 3

function foo(myVar) {
console.log(myVar);
}